OSNA NMH, NMH 65, NMH 80, NMV 32, NMV 40 Operating Manual

Ver.17-02

Original Operating Manual

NMH/NMV High-Pressure

Centrifugal Pump

OSNA-Pumpen GmbH

Brückenstrasse 3

49090 Osnabrück, Germany

Phone: [phone] - 0

Fax: [phone] - 220

Internet: http://www.osna.de

E-mail: [email protected]

NMH/NMV High Pressure Centrifugal Pump 1

Contents

1 GENERAL ........................................................................................................................................ 6

1.1 About this operating manual .................................................................................................... 6

1.2 Target groups .......................................................................................................................... 6

1.3 Other valid documents ............................................................................................................. 6

1.4 Warning notices and symbols .................................................................................................. 7

1.5 Copyright/changes ................................................................................................................... 7

2 SAFETY ........................................................................................................................................... 8

2.1 Correct and proper use ............................................................................................................ 8

2.2 General safety instructions ...................................................................................................... 9

2.2.1 Product safety ...................................................................................................................... 9

2.2.2 Duties of the system owner ................................................................................................. 9

2.2.3 Duties of personnel ............................................................................................................ 10

2.3 Dangers of non-observance of the safety instructions .......................................................... 11

2.4 Unauthorized conversion and production of spare parts ....................................................... 11

2.5 Unauthorized modes of operation ......................................................................................... 11

2.6 Special hazards ..................................................................................................................... 11

2.6.1 Explosion area ................................................................................................................... 11

2.6.2 Hazardous pumping media ................................................................................................ 11

2.6.3 Noise emissions................................................................................................................. 12

3 LAYOUT AND FUNCTION ............................................................................................................ 13

3.1 Labeling ................................................................................................................................. 13

3.1.1 Pump type labeling ............................................................................................................ 13

3.1.2 Type plate .......................................................................................................................... 13

3.2 Scope of delivery of an NMH/NMV high-pressure centrifugal pump ..................................... 14

3.3 General information ............................................................................................................... 14

3.4 Technical data ....................................................................................................................... 15

3.5 Operating point ...................................................................................................................... 15

3.6 Minimum output rates ............................................................................................................ 15

3.7 Functional and operating elements ....................................................................................... 16

3.8 Auxiliary operating systems ................................................................................................... 16

4 TRANSPORT AND INTERMEDIATE STORAGE ......................................................................... 18

4.1 Transport ............................................................................................................................... 18

4.1.1 Unpacking and checking the delivery condition ................................................................ 18

4.1.2 Lifting ................................................................................................................................. 18

4.2 Intermediate storage .............................................................................................................. 19

4.3 Storage .................................................................................................................................. 19

4.4 Disposal ................................................................................................................................. 20

2 NMH/NMV High Pressure Centrifugal Pump

5 ASSEMBLY AND INSTALLATION ............................................................................................... 21

5.1 Preparing for installation ........................................................................................................ 21

5.1.1 Preparing the installation location...................................................................................... 21

5.1.2 Preparing the base surface and foundations ..................................................................... 21

5.1.3 Removing the preservative ................................................................................................ 22

5.2 Installation .............................................................................................................................. 23

5.2.1 Installing the pump ............................................................................................................ 23

5.2.2 Securing the pump unit ...................................................................................................... 25

5.2.3 Assembling the motor ........................................................................................................ 25

5.3 Fine alignment of the coupling ............................................................................................... 26

5.3.1 Horizontal configuration ..................................................................................................... 26

5.3.2 Vertical configuration ......................................................................................................... 27

5.4 Aligning the motor .................................................................................................................. 28

5.4.1 Aligning the motor with shims ............................................................................................ 28

5.4.2 Aligning the motor with adjustment screws ....................................................................... 28

5.5 Planning pipelines ................................................................................................................. 29

5.5.1 General .............................................................................................................................. 29

5.5.2 Avoiding contaminations in the pipelines .......................................................................... 31

5.5.3 Configuring supports and flange connections ................................................................... 31

5.5.4 Determining nominal widths .............................................................................................. 31

5.5.5 Determining pipeline lengths ............................................................................................. 31

5.5.6 Optimizing changes in cross-section and direction ........................................................... 32

5.5.7 Providing safety and monitoring systems (recommended) ............................................... 32

5.6 Attaching the pipelines .......................................................................................................... 32

5.6.1 Installing auxiliary pipelines ............................................................................................... 32

5.6.2 Installing the suction pipe .................................................................................................. 33

5.6.3 Installing the pressure pipe ................................................................................................ 33

5.6.4 Checking for lack of tension in the pipeline connection .................................................... 33

5.7 Electrical connection .............................................................................................................. 34

5.7.1 Connecting the motor ........................................................................................................ 34

5.7.2 Earthing the pump ............................................................................................................. 35

6 COMMISSIONING/ DECOMMISSIONING .................................................................................... 36

6.1 Commissioning ...................................................................................................................... 36

6.1.1 Determining the pump configuration.................................................................................. 36

6.1.2 Filling the pump ................................................................................................................. 36

6.1.3 Checking direction of rotation ............................................................................................ 37

6.1.4 Starting the pump .............................................................................................................. 38

6.2 Decommissioning .................................................................................................................. 39

6.2.1 Switching off the pump ...................................................................................................... 41

6.2.2 Draining the pump and protecting against frost ................................................................. 41

6.3 Recommissioning .................................................................................................................. 41

NMH/NMV High Pressure Centrifugal Pump 3

6.4 Operating the stand-by pump ................................................................................................ 41

6.5 Shaft seal ............................................................................................................................... 42

6.5.1 Mechanical seal ................................................................................................................. 42

6.5.2 Gland packing .................................................................................................................... 42

7 MAINTENANCE AND REPAIR ..................................................................................................... 43

7.1 General information ............................................................................................................... 43

7.2 Operational monitoring .......................................................................................................... 44

7.3 Maintenance .......................................................................................................................... 45

7.3.1 Anti-friction bearings and grease lubrication ..................................................................... 46

7.3.2 Servicing the electric motors ............................................................................................. 46

7.3.3 Servicing the mechanical seals ......................................................................................... 47

7.3.4 Servicing the gland packing ............................................................................................... 47

7.4 Sending the pump to the manufacturer ................................................................................. 48

7.5 Disassembling the pump ....................................................................................................... 49

7.6 Ordering spare parts .............................................................................................................. 51

8 FAULTS AND TROUBLESHOOTING ........................................................................................... 52

9 APPENDIX ..................................................................................................................................... 55

9.1 Additional ATEX instructions ................................................................................................. 55

9.1.1 Safety ................................................................................................................................. 55

9.1.2 Explosion protection marking ............................................................................................ 56

9.1.3 Installation and connection ................................................................................................ 57

9.1.4 Operation ........................................................................................................................... 59

9.1.5 Maintenance and repair ..................................................................................................... 59

9.2 Spare parts list for constant operation over two years as per DIN 24296 ............................. 60

9.3 Cross-sections ....................................................................................................................... 61

9.4 Declaration of Conformity as per EC Directive 2006/42/EC, Annex IIA ................................ 67

9.5 Declaration of Conformity as per EC Directive 2014/34/EC, Annex VI ................................. 68

9.6 Clearance Certificate ............................................................................................................. 69

4 NMH/NMV High Pressure Centrifugal Pump

List of Tables

Table 1: Target groups and their tasks .................................................................................................... 6

Table 2: Other valid documents and their purposes .............................................................................. 6

Table 3: Warning notices and consequences of non-observance ......................................................... 7

Table 4: Symbols and their meanings ..................................................................................................... 7

Table 5: Sound pressure level ............................................................................................................... 12

Table 6: Main parameters at 1450 rpm ................................................................................................. 15

Table 7: Main parameters at 2900 rpm ................................................................................................. 15

Table 8: Pump series' flange sizes ........................................................................................................ 15

Table 9: Minimum output rates with closed shut-off valve ................................................................... 15

Table 10: Maximum authorized operating temperature at the shaft seal .............................................. 16

Table 11: Ambient conditions ................................................................................................................ 21

Table 12: Settings for the time relay when using three-phase motors with star-delta switch ............... 35

Table 13: Measures depending on the behavior of the pumping medium ........................................... 40

Table 14: Measures in the event of operational interruption ................................................................ 40

Table 15: Measures following longer shut down times ......................................................................... 41

Table 16: Stuffing box dimensions ........................................................................................................ 48

Table 17: Measures for return ............................................................................................................... 49

Table 18: Fault/number allocation ......................................................................................................... 52

Table 19: Troubleshooting table ............................................................................................................ 54

Table 20: Temperature classes ............................................................................................................. 56

Table 21: Ignition protection classes ..................................................................................................... 56

Table 22: Ex atmosphere ...................................................................................................................... 57

Table 23: Equipment groups/areas of use/zone/category ..................................................................... 57

Table 24: Possible devices for monitoring self-warming due to dry running ......................................... 58

Table 25: Measures against unauthorized self-warming ....................................................................... 58

Table 26: Max. pumping medium temperature...................................................................................... 59

Table 27: Spare parts for constant operation over two years ............................................................... 60

Table 28: NMH parts list ........................................................................................................................ 63

Table 29: NMV parts list ........................................................................................................................ 66

NMH/NMV High Pressure Centrifugal Pump 5

List of Images

Figure 1: Model code ............................................................................................................................. 13

Figure 2: Standard version type plate ................................................................................................... 13

Figure 3: ATEX version type plate ......................................................................................................... 13

Figure 4: Scope of delivery for NMH with free shaft .............................................................................. 14

Figure 5: Scope of delivery for NMV without motor ............................................................................... 14

Figure 6: Scope of delivery for NMH as complete unit .......................................................................... 14

Figure 7: Scope of delivery for NMV as complete unit .......................................................................... 14

Figure 8: Gland packing ........................................................................................................................ 16

Figure 9: Mechanical seal ...................................................................................................................... 16

Figure 10: Pressure-side external flushing connection (optional) ........................................................ 17

Figure 11: Suction-side external flushing connection (optional)........................................................... 17

Figure 12: Lifting an NMH centrifugal pump (unit) ................................................................................ 18

Figure 13: Lifting an NMH centrifugal pump (free shaft end) ............................................................... 19

Figure 14: Lifting an NMV centrifugal pump .......................................................................................... 19

Figure 15: Mounting material for complete units ................................................................................... 23

Figure 16: Mounting material for pump with open shaft end ................................................................ 23

Figure 17: Aligning the base plate ......................................................................................................... 24

Figure 18: Positional alignment of the shafts ........................................................................................ 26

Figure 19: Directional alignment of the shafts ....................................................................................... 26

Figure 20: Aligning the motor with adjustment screws .......................................................................... 28

Figure 21: Functional and operating elements ...................................................................................... 29

Figure 22: Recommended straight pipeline lengths upstream and downstream of the pump .............. 31

Figure 23: NMH earthing screws ........................................................................................................... 35

Figure 24: NMV earthing screws ........................................................................................................... 35

Figure 25: Pressure-side stuffing box (standard) .................................................................................. 48

Figure 26: Suction-side stuffing box (standard) .................................................................................... 48

Figure 27: Cross-section of NMH with mechanical seal ........................................................................ 61

Figure 28: Cross-section of NMH with gland packing ........................................................................... 62

Figure 29: Cross-section of NMV with mechanical seal ........................................................................ 64

Figure 30: Cross-section of NMV with gland packing ........................................................................... 65

1 General

6 NMH/NMV High Pressure Centrifugal Pump

1 General

1.1 About this operating manual

This operating manual contains important in­structions that must be observed during instal­lation, operation and maintenance. For this
reason, ensure that it is read by specialist per­sonnel and the responsible operator/owner
prior to assembly and commissioning. The
manual must be available at all times at the
location where the system is used.

Please observe the safety instructions de­scribed in this operating manual, along with the
relevant national accident prevention regula­tions and any internal work, operational and
safety specifications of the operator. We as­sume no liability for damages and operational
interruptions resulting from non-observance of
this operating manual.

WARNING

Pay particular attention to section 2 "Safety
instructions" during commissioning and all
maintenance work.

Section 2 also provides an explanation of the
symbols used in this manual. Knowledge of
this operating manual is essential to preventing
errors and ensuring safe and uninterrupted
operation.

The operating specification does not take local
safety regulations into account. The owner
bears full responsibility for compliance with
these, including on the part of the assembly
personnel used.

This operating manual:

· is part of the pump

· is valid for all type series mentioned

· describes safe and proper use in all

phases of operation

1.2 Target groups

Target group

Task

System owner

► Ensure that this manu­al is available at the loca­tion where the system is
used, including for later
reference.

► Ensure that personnel

read and observe this
operating manual and the
other valid documents, in
particular the safety and
warning information.

► Observe additional

system

-related regula-

tions and specifications.

Specialist personnel,
assembly staff

► Read, observe and

follow this operating
manual and the other
valid documents, in par­ticular the safety and
warning information.

Table 1: Target groups and their tasks

1.3 Other valid documents

Document

Purpose

Installation diagram

Installation dimen­sions, connection
dimensions, etc.

Spare parts list

Ordering spare
parts

Clearance certificate

Returning the pump

Declaration of conformity

Conformity with
standards, content
of the declaration of
conformity

Table 2: Other valid documents and

their purposes

1 General

NMH/NMV High Pressure Centrifugal Pump 7

1.4 Warning notices and symbols

Warning notice

Hazard
level

Consequenc­es of non

-

observance

DANGER

Immediate
hazard

Death, severe
physical injury

WARNING

Potential
hazard

Death, severe
physical injury

CAUTION

Potentially
dangerous
situation

Minor physical
injury

NOTICE

Potentially
dangerous
situation

Material dam­age

Additional
information
on explo­sion

pr

o-

tection

Death, minor to
severe physical
injuries, mate­rial damage

Table 3: Warning notices and consequences

of non-observance

Symbol

Meaning

Safety sign

► Follow all instructions

identified with safety signs
in order to avoid death or
injuries.

►

Instruction

1. , 2. , …

Instruction with multiple
steps

Condition

→

Reference

Information, note

Table 4: Symbols and their meanings

1.5 Copyright/changes

The intellectual property and all copyrights
related to this technical documentation remain
exclusively with OSNA-Pumpen GmbH. All
rights reserved, in particular the right to repro­duction and distribution of this documentation,
including translations thereof.

No part of this documentation may be repro­duced in any form (print, photocopy, microfilm
or any others process), stored, processed,
reproduced or distributed using electronic sys­tems without written permission.

Editorial changes reserved exclusively by
OSNA-Pumpen GmbH.

Any violation is punishable and subject to
compensation.

OSNA GmbH reserves the right to change the
contents of this documentation without notice.

2 Safety

8 NMH/NMV High Pressure Centrifugal Pump

2 Safety

Observe the additional instructions for

pumps in areas at risk of explosion.

The manufacturer shall not bear any liability

for damages caused as a result of non­observance of this documentation.

2.1 Correct and proper use

· Only use this pump for the purposes of
conveying the agreed pumping media.

· Comply with operating limits.

· The water may not contain any abra-

sive or long-fibered components that
may damage the pump materials.
Consult the manufacturer if using other
media.

· Ensure that the pump is only commis-
sioned with pumping medium and is
not operated without it.

· Open the suction-side fitting, and do
not use it to control the flow rate.

· To avoid damaging the motor, observe
the permitted number of times per
hour that the motor can be switched
on (→ Manufacturer information).

· Any other use must be agreed with the
manufacturer.

· The temperature of the pumping me-
dium must not exceed 140 °C.

Avoiding obvious misuse (examples)

· Observe the operating limits of the
pump for temperature, pressure, flow
rate and speed.

The use of pumps in ATEX zones is subject
to additional specifications related to cor­rect and proper use!

► Do not operate the pump:

- when the fittings are closed

- when the operating range is exceeded

(à data sheet)

- when maintenance intervals are ex-
ceeded

à 9.1.1 Safety, pg 55

The main areas of use are:

· Pressure boosting systems, heating
systems, hot and cold water circula­tion, water supply systems, power sta­tions, filtering systems, filling and emp­tying of tanks, water circulation in
pools and sprinkler systems

· Fresh water, drinking water, boiler
feed water, process water, sea and
brackish water, hot water, condensate
and many media without aggressive
components that do not chemically
corrode the materials used in the
pump

Do not operate the pump without pumping
medium. Dry running can lead to damage to
the pump.

2 Safety

NMH/NMV High Pressure Centrifugal Pump 9

WARNING

Any use that goes beyond the purposes
described above shall be considered im­proper use. OSNA shall bear no liability for
any resulting damages. The owner bears
full risk for improper use.

2.2 General safety instructions

Please observe the following specifications

before performing any activities.

2.2.1 Product safety

This pump is constructed according to the
latest state of the art and accepted safety
rules. Nevertheless, risks to life and limb for
the user or third parties are still possible when
using the pump, as are impairments to the
pump and other material assets.

· Only use the pump in a technically
perfect state and for the intended pur­pose. Ensure compliance with this op­erating manual and be aware of the
hazards and safety issues during op­eration.

· Keep this operating manual and all
other valid documents in a complete
and legible state, and store in a loca­tion that is accessible at all times to
personnel.

· Do not permit any activity that endan-
gers personnel or uninvolved third par­ties.

· In the event of a safety-relevant fault,
stop the pump immediately and have
the fault rectified by responsible per­sonnel.

· In addition to this documentation, en-
sure compliance with the statutory or
other regulations for safety and acci­dent prevention, as well as the rele­vant standards and specifications of
the respective country.

· Do not remove any technical stickers.

2.2.2 Duties of the system owner

Safety-conscious work

Observe the safety specifications detailed in
this operating manual, along with the occupa­tional safety regulations and all additional in­ternal safety regulations.

· Only use the pump in a technically
perfect state and for the intended pur­pose. Ensure compliance with this op­erating manual and be aware of the
hazards and safety issues during op­eration.

· Ensure compliance and monitoring:

- correct and proper use

- statutory or other safety and acci-

dent prevention regulations

- safety specifications for handling

hazardous substances

· Provide personal protective equip-
ment.

· Do not remove contact protection dur-
ing operation.

· Prevent any dangers from electrical
energy (for details, please refer to the

2 Safety

10 NMH/NMV High Pressure Centrifugal Pump

specifications of the VDE and the local
energy supplier).

· Switch off the motor during all assem-
bly and maintenance works, and se­cure against reactivation.

· Only work on the system when the
pump is at a standstill.

Personnel qualification

The owner of the system must ensure that the
personnel tasked with working on the pump
have read and understood this operating man­ual and all other valid documents before be­ginning work, in particular information on safe­ty, maintenance and repair.

Work of any kind on the machine may only be
performed when it has been completely de­commissioned. Reinstall and reactivate all
safety mechanisms after work.
Before restarting the machine, ensure that all
necessary commissioning steps have been
completed.

· Determine responsibilities, tasks and
monitoring for personnel.

· Only allow work of any kind to be per-
formed by specialist technical person­nel:

- assembly, maintenance and repair

work

- work on the electrical systems

· Only allow personnel undergoing train-
ing to perform work on the pump under
the supervision of specialist technical
personnel.

Safety mechanisms

· Provide the following safety mecha-
nisms and ensure that they function
correctly:

- for moving components: contact
protection for the pump, installed
by the customer

- for potential electrostatic charges:
provide appropriate earthing

Guarantee

· Please consult the manufacturer be-
fore carrying out any conversions, re­pairs or changes during the guarantee
period.

· Only use original parts or parts ap-
proved by the manufacturer.

The use of pumps in ATEX zones is subject
to additional specifications related to work
safety!

à 9.1.1 Safety, pg 55

2.2.3 Duties of personnel

· Observe the information on the pump
and ensure it is legible (e.g. direction
of rotation arrow, fluid connection indi­cators).

· Do not remove the contact protection
for moving parts during operation.

· Use personal protective equipment if
necessary.

· Only work on the system when the
pump is at a standstill.

2 Safety

NMH/NMV High Pressure Centrifugal Pump 11

· Switch off the motor during all assem-
bly and maintenance works, and se­cure against reactivation.

· Reinstall the safety mechanisms after
working on the pump according to
specifications.

2.3 Dangers of non-observance of
the safety instructions

· Non-observance of the safety instruc-
tions can lead to hazards to personnel,
the machine and the environment.

· Non-observance of the safety instruc-
tions can also lead to the loss of any
damage claims.

· In particular, non-observance can lead
to the following dangers:

- failure of important system func-

tions

- electrical and mechanical hazards

to personnel

2.4 Unauthorized conversion and
production of spare parts

Conversions or changes to the machine are
only permitted following consultation with the
manufacturer. Original spare parts and acces­sories authorized by the manufacturer help
ensure safety. The manufacturer bears no
liability for the consequences of the use of
other parts.

2.5 Unauthorized modes of opera­tion

The operational safety of the machine is only
guaranteed when it is used for the intended

purpose according to the operating manual (→

2.1 Correct and proper use, pg 8).

Never exceed the limit values indicated in the
technical data (→ Data sheet).

2.6 Special hazards

2.6.1 Explosion area

· Only use pumps with ATEX certifica-

tion in areas at risk of explosion. (à

3.1.2 Type plate, pg 13)

The use of pumps in ATEX zones is subject
to additional requirements!

à 9.1 Additional ATEX instructions, pg 55

2.6.2 Hazardous pumping media

· Observe the safety regulations for
handling hazardous substances (e.g.
toxic, hazardous to health).

· Use personal protective equipment
when performing work on the pump.

2 Safety

12 NMH/NMV High Pressure Centrifugal Pump

2.6.3 Noise emissions

Conditions for measurement:

· Distance to pumping unit: 1 m

· Operation: Free of cavitation

· Motor: IEC standard motor

· Tolerance: ± 3 dB(A)

Drive power in kW

Noise emissions in dB(A)

1450 min-1

2900 min-1

0.75

50

58

1.1

53

62

1.5

55

62

2.2

56

63

3.0

58

65

4.0

60

66

5.5

64

70

7.5

65

71

11.0

68

73

15.0

69

74

18.5

69

74

22.0

70

75

30.0

71

75

37.0

72

76

45.0

73

77

55.0

73

79

75.0

74

81

90.0

74

82

110.0

75

83

132.0

76

84

Table 5: Sound pressure level

Low-noise motors can be provided if the ex­pected noise values exceed the permitted lim­its.

3 Layout and function

NMH/NMV High Pressure Centrifugal Pump 13

3 Layout and function

3.1 Labeling

3.1.1 Pump type labeling

This operating manual applies to the
NMH/NMV type series.

Model code:

Figure 1: Model code

Key:

1 Type series

2 Horizontal configuration

3 Vertical configuration

4 Nominal diameter of discharge nozzle

[mm]

5 Max. impeller diameter [mm]

6 Number of stages

3.1.2 Type plate

Standard configuration:

Figure 2: Standard version type plate

ATEX configuration:

Figure 3: ATEX version type plate

Key:

1 Year of production

2 Delivery head [m]

3 Power requirements [kW]

4 Speed [min-1]

5 Flow rate [m³/h]

6 Pump number

7 Pump type

8 ATEX protection class

3 Layout and function

14 NMH/NMV High Pressure Centrifugal Pump

3.2 Scope of delivery of an
NMH/NMV high-pressure centrifugal
pump

The customer can order the pump:

- with a free shaft (NMH) or without motor
(NMV)

- as a complete unit, i.e. fully assembled on
base plate with drive motor, coupling and
coupling guard

Figure 4: Scope of delivery for NMH with free shaft

Figure 5: Scope of delivery for NMV without motor

Figure 6: Scope of delivery for NMH as complete unit

Figure 7: Scope of delivery for NMV as complete unit

Key:

1 Pump

2 Drive motor

3 Baseplate

4 Coupling

5 Coupling guard

6 Pump base

The scope of delivery corresponds to the
scope indicated in the order. Please check that
the delivery is complete upon receipt. Notify
the delivery company of any transport damage
immediately. Please also refer to our condi­tions of sale and delivery. If using other motor
brands, please ensure that the motors have
the following drive torques as a multiple of the
nominal torque.

3.3 General information

The NMH/NMV pump series are non self­priming, multistage, high-pressure centrifugal
pumps in horizontal and vertical configuration.
The suction and discharge nozzles can be
installed at different stages of 90°.

The horizontal-configuration pumps are fitted
with anti-friction bearings. The vertical­configuration pumps have one anti-friction
bearing (pressure side) and one plain bearing
(suction side).

3 Layout and function

NMH/NMV High Pressure Centrifugal Pump 15

Both vertical and horizontal pumps can be
fitted with either an uncooled mechanical seal
or an uncooled gland packing.

3.4 Technical data

Main parameters:

NMH/NMV at speed = 1450 min-1

(gray cast iron)

Series

Delivery

head

Flow rate

H

max

Q

min

Q

opt

Q

max

m

m³/h

m³/h

m³/h

32

104

1.8

8.5

12

40

110

3.75

16.0

25

50

154

5.25

30.0

35

65

198

9.75

42.0

65

80

226

15.0

65.0

100

Table 6: Main parameters at 1450 rpm

NMH/NMV at speed = 2900 min-1

(gray cast iron)

Series

Delivery

head

Flow rate

H

max

Q

min

Q

opt

Q

max

m

m³/h

m³/h

m³/h

32

336

3.3

16.5

22

40

362

6.6

30.0

44

50

381

10.1

50.0

67

65

400

16.5

80.0

110

80

400

27

135.0

180

Table 7: Main parameters at 2900 rpm

Flange:

NMH/NMV

series

Suction side

Pressure side

NPS

PN

NPS

PN

32

50

40

32

40

40

65

40

40

40

50

80

40

50

40

65

100

40

65

40

80

125

40

80

40

Table 8: Pump series' flange sizes

Drive unit:

NMH: 50 and 60 Hz electric motor, diesel

motor or turbine

NMV: Electric motor with IEC flange, V1 con-

figuration or hydraulic motor with spe­cial flange

3.5 Operating point

In order to reach the required operating point,
it may be necessary to fit the pump with two
different sizes of impeller blade. For this rea­son, please provide the impeller blade diame­ter or position on the shaft when ordering
spare parts (1st, 2nd impeller, etc., beginning
at the suction side of the pump).

Please always indicate the pump type and
order number when ordering spare parts, or in
the event of any queries.

3.6 Minimum output rates

Pump tempe

rature

range

Minimum output rate
at design point

–

10 to +100 °C

15% of Q

opt

+100 to +140°C

20% of Q

opt

Table 9: Minimum output rates with closed

shut-off valve

3 Layout and function

16 NMH/NMV High Pressure Centrifugal Pump

3.7 Functional and operating ele-

ments

Shaft wearing sleeve:

Shaft

wearing

sleeve

NMH

NMV

Uncooled gland
packing

Up to 110 °C

Up to 100 °C

Uncooled mechan­ical seal

Up to 140 °C

Up to 140 °C

Table 10: Maximum authorized operating temperature

at the shaft seal

The pumps can be fitted with gland packing or
mechanical seal as required.

Gland packing consists of a number of com­pression-molded rings in a stuffing box. Gland
packings can be adjusted by hand with tools.

Figure 8: Gland packing

Mechanical seals are mechanical shaft seals
with internal flushing of the rotating seal rings
(self-adjusting).

Figure 9: Mechanical seal

The technical dry running properties of gland
packing and mechanical seals are extremely
limited. For this reason, avoid dry running.
Ensure that the pump is vented before com­missioning.

3.8 Auxiliary operating systems

When blocking, the pressure of the sealing
medium is higher than that of the pumping
medium.

Example: Pumping media that crystallize or
are laden with solid particles, and can there­fore damage the seal over time.

3 Layout and function

NMH/NMV High Pressure Centrifugal Pump 17

Figure 10: Pressure-side external flushing

connection (optional)

Figure 11: Suction-side external flushing

connection (optional)

4 Transport and intermediate storage

18 NMH/NMV High Pressure Centrifugal Pump

4 Transport and intermediate
storage

4.1 Transport

Weight information (→ Other valid docu-

ments)

4.1.1 Unpacking and checking the de-

livery condition

1. Check that the delivery is complete
upon receipt.

2. Unpack the pump/unit upon delivery
and check for transport damage.

3. Notify the delivery company of any
transport damage immediately.

4. Dispose of the packaging material in
line with the applicable local regula­tions.

4.1.2 Lifting

Transport the pumps carefully and secure
them to prevent damage. If using a horizontal
pump, transport the entire unit using ropes as
shown in Figure 12 (pg 18) (do not secure the
ropes on the motor eyelets). Transport vertical
pumps as shown in Figure 14 (pg 19).

DANGER

Risk of death or crushed limbs from falling
transported goods!

► Choose lifting equipment that is suitable for

the total weight to be transported.

► Secure the lifting equipment according to

the following images.

► Do not stand under suspended loads.

Figure 12: Lifting an NMH centrifugal pump (unit)

4 Transport and intermediate storage

NMH/NMV High Pressure Centrifugal Pump 19

Figure 13: Lifting an NMH centrifugal pump

(free shaft end)

Figure 14: Lifting an NMV centrifugal pump

4.2 Intermediate storage

Ensure during intermediate storage that the
pump is not exposed to any weather conditions
for a long period of time. If the pump is de­commissioned for a longer period of time (ap­proximately 2 to 3 months), ensure that it is
fully drained. (→ 6.2 Decommissioning, pg 39)

4.3 Storage

NOTICE

Material damage due to incorrect storage!

► Ensure that the pump is correctly
stored.

1. Close all openings with blank flanges,
blind plugs or plastic covers.

2. Ensure that the storage area meets
the following conditions:

– dry
– free of frost
– free of vibrations

3. Rotate the shaft once per month by
several rotations.

4 Transport and intermediate storage

20 NMH/NMV High Pressure Centrifugal Pump

NOTICE

Damage to bearings due to high water
pressure or splashing water!

► Do not use water jets or steam jet cleaners

to clean the bearing areas and motor.

NOTICE

Damage to seals due to incorrect cleaning
agent!

► Ensure that the cleaning agent does not

corrode the seals.

1. Choose the cleaning agent according
to the area of use.

2. Dispose of preservatives in line with
the applicable local regulations.

3. When storing for longer than 6
months:

– Check all elastomers (round seals,

shaft seal rings, gaskets and gland
packing) for elasticity, and replace
if necessary.

4.4 Disposal

Plastic parts may be contaminated by toxic
or radioactive pumping media. If this is the
case, cleaning is not sufficient.

WARNING

Risk of poisoning and environmental dam­age from pumping medium!

► Use personal protective equipment when

performing work on the pump.

► Before disposing of the pump:

– Collect any remaining pumping

medium in the pump, and dispose
of it in line with the locally valid
regulations.

– Neutralize any pumping medium

residues in the pump.

► Dispose of the pump in line with the appli-

cable local regulations.

5 Assembly and installation

NMH/NMV High Pressure Centrifugal Pump 21

5 Assembly and installation

5.1 Preparing for installation

NOTICE

Material damage due to contamination!

► Only remove covers, transport caps and

sealing caps immediately before connecting
the pump to the pipelines.

CAUTION

Ensure compliance with all safety specifi­cations during installation and operation.

1. Ensure that the required ambient con­ditions are met (à 5.1.1 Preparing the
installation location, pg 21)

2. Please consult the manufacturer when
installing at altitudes over 1000 m
above mean sea level.

5.1.1 Preparing the installation loca­tion

► Ensure that the installation location meets

the following conditions:

– pump is freely accessible from all

sides

– sufficient space for installing/removing

piping, as well as for maintenance and
repair work, in particular for in­stalling/removing the pump and motor

– no effects from external vibrations on

the pump (bearing damage)

– protection against frost

Temperature

[°C]

Relative humidity [%]

Installation

altitude

above

mean sea

level [m]

long term

short term

-10 to 40

≤ 85

≤ 100

≤ 1000

Table 11: Ambient conditions

5.1.2 Preparing the base surface and
foundations

► Ensure that the base surface and founda-

tions meet the following conditions:

– level
– clean (no oils, dust or other contami-

nations)

– foundations can support the weight of

the pump unit and all operating forces

– stability of the pump unit ensured

5 Assembly and installation

22 NMH/NMV High Pressure Centrifugal Pump

5.1.3 Removing the preservative

Only necessary for preserved pump.

WARNING

Risk of poisoning from preservatives and
cleaning agents in the food and drinking
water area!

► Only use cleaning agents that are compati-

ble with the pumping medium.

► Remove the preservative completely.

NOTICE

Damage to bearings due to high water
pressure or splashing water!

► Do not use water jets or steam jet cleaners

to clean the bearing areas.

NOTICE

Damage to seals due to incorrect cleaning
agent!

► Ensure that the cleaning agent does not

corrode the seals.

1. Choose the cleaning agent according
to the area of use.

2. Dispose of preservatives in line with
the local regulations.

3. If storing for longer than 6 months:

- Replace elastomers made from
EPDM.

- Check all elastomers (round seals,
shaft seals) for proper elasticity
and replace if necessary.

5 Assembly and installation

NMH/NMV High Pressure Centrifugal Pump 23

5.2 Installation

5.2.1 Installing the pump

Prior to installation, remove the packaging (if
present) and check the pump for any transport
damage. Ensure that the installation area is
dry and free of frost.

CAUTION

Do not operate the pump in areas where
there is a risk of explosion. Ensure that the
pump is installed and connected in line
with the local regulations.

We recommend installing the pump on a

noise-insulating base, in order to prevent
transmission noises to parts of the building.

Provide an outlet for leakage fluid during
maintenance work.

During installation, align the entire unit on the
foundation using a spirit level (on
shaft/discharge nozzle). Maintain the distance
between the coupling halves according to the
installation plan. Always insert bearing plates
on the left and right side next to the mounting
material between the base plate/base frame
and the foundation. Provide additional bearing
plates if the distance between the mounting
materials is greater than 800 mm. Ensure that
all bearing plates sit solidly. Base plates with a
width greater than 400 mm must be filled out
after mounting with a vibration-dampening
mortar up to the upper edge of the frame.

Figure 15: Mounting material for complete units

If the pump and motor are delivered separate­ly, place the pump onto the foundation without
the motor, align using a precision spirit level
and secure. For alignment purposes, always
insert bearing plates on the left and right side
next to the mounting material between the
pump base and the foundation. Ensure that all
bearing plates sit solidly.

Figure 16: Mounting material for pump with

open shaft end

If the pump has two or more anchoring points
(see overall diagram or installation plan), en­sure that they are not strained axially or radial­ly.

5 Assembly and installation

24 NMH/NMV High Pressure Centrifugal Pump

NOTICE

Material damage due to strain on the base
plate!

► Place and secure the base plate to the

foundation as follows.

ü Aids, tools, material:

(not included in delivery)

- Foundation bolts

- Steel shims

- Mortar casting compound, vibra-

tion free

- Spirit level

Figure 17: Aligning the base plate

1. Lift the pump unit (à 4.1.2 Lifting, pg

18).

2. Insert the foundation screws from be­low into the fastening holes on the
base plate.

If using adhesive anchors, observe the

manufacturer's information.

3. Place the pump unit on the foundation,
inserting the foundation screws into
the prepared anchoring holes as you
do so.

4. Align the pump unit to the required
height and system dimensions as fol­lows using steel shims:

- Use one steel shim (2) to the left
and right of each foundation screw
(1).

- If the distance between the an­choring holes is greater than 700
mm, add additional steel shims (3)
on each side of the base plate in
the middle.

5. Ensure that the base plate and the
steel shims lie flat.

6. Check the maximum permitted height
deviation (1 mm/m) laterally and longi­tudinally using a machine spirit level.

7. Repeat the process until the baseplate
is correctly aligned.

The use of pumps in ATEX zones is subject
to additional requirements!

à 9.1.3 Installation and connection, pg 57

Take the following additional measures
when operating pumps in ATEX zones

· Only use touch guard elements (e.g.
coupling guard) made from electrically
conductive materials.

· Secure the grub screw for connecting
the coupling halves (e.g. using Loctite
medium strength)

5 Assembly and installation

NMH/NMV High Pressure Centrifugal Pump 25

· Remove any metal shavings and dirt
residues from all touch guard ele­ments.

· The motor must meet the require-
ments of the area at risk of explosion
(group, category).

· Install a soft-closing non-return valve
between the discharge nozzle and the
shut-off valve to prevent the backflow
of pumping medium after the pump is
switched off.

· If using a frequency inverter, please
consult the manufacturers of the pump
and the frequency inverter beforehand.

5.2.2 Securing the pump unit

Filling out the base plate with a mortar

casting compound improves the insulation
properties.

1. Fill out the anchoring holes with mortar
casting compound.

2. Once the mortar casting compound
has set, screw the base plate tightly at
three points using the specified tight­ening torque.

3. Before tightening the remaining
screws, compensate for any uneven­ness in the mounting surface using
spacers on each screw.

4. Check the pump unit for tensions us­ing a straitedge.

5. Fill out the inside of the base plate if
provided. Knock on the base plate to
prevent cavities.

5.2.3 Assembling the motor

Only necessary if the pump unit is complet­ed at the installation location.

Ensure that the shaft is cleaned of anti-rusting
agent, and that both coupling halves are
pushed onto the shaft. We recommend check­ing the direction of rotation as per section 6.1.3
(pg 37) before assembling the motor.

CAUTION

Incorrect direction of rotation on the pump
can lead to damage to the mechanical seal
and a reduction in performance. Please
observe the direction of rotation arrow on
the pump.

NOTICE

Incorrectly aligned shafts can cause in­creased wear on the bearings, seal rings,
shaft seals and elastic coupling elements.
They can also cause increased noise when
the unit is running.

Place the motor on the base plate. Compen­sate for the height difference between the
shafts precisely using shims. The distance
between the shaft ends should not exceed 3
mm.

5 Assembly and installation

26 NMH/NMV High Pressure Centrifugal Pump

5.3 Fine alignment of the coupling

The unit is correctly aligned when a ruler
placed across both halves of the coupling is
the same distance from the respective shaft at
all points around the circumference. Do not
forget to turn the measurement point by hand.
Furthermore, both halves of the coupling must
be the same distance from each other at all
points around the circumference. Check this
using a tracer or gauge.

NOTICE

Material damage due to shocks and im­pacts!

► Do not tilt the two halves of the coupling

when pushing them onto the shaft.

► Avoid knocking the pump components.

The central axes of the pump and motor are
aligned according to their:

a) position
b) direction

Achieve both of these conditions by inserting
or removing shims of different thicknesses
under the pump or motor feet as appropriate.
Afterwards, tighten the fastening screws of the
pump and motor.

a) Position

A ruler placed on the coupling must lie
flat on both halves, offset by 90°,
around the circumference (à Figure
18, pg 26).

Figure 18: Positional alignment of the shafts

b) Direction

The axial distance (x) between the
halves of the coupling must be equal
around the entire circumference. Set
coupling distance x to 4 - 5 mm, and
secure against axial displacement (à
Figure 19, pg 26).

Figure 19: Directional alignment of the shafts

5.3.1 Horizontal configuration

1. Apply a very thin layer of molybdenum
disulfide (e.g. Molykote) to the shaft
ends on the pump and motor.

2. Insert the keys.

3. If using fitting device, remove the rub­ber buffer and heat the two halves of
the coupling to around 100 °C.

4. Push the pump-side and motor-side
coupling halves onto the shaft until the
shaft end is flush with the coupling
hub. When assembled, maintain a dis­tance of 4 - 5 mm between the cou­pling halves.

5 Assembly and installation

NMH/NMV High Pressure Centrifugal Pump 27

5. Tighten the grub screws on both cou­pling halves.

6. Place suitable bearing plates beneath
the motor/pump until the ends of the
respective shafts are flush.

7. Insert the motor screws, but do not

tighten (à 5.4 Aligning the motor, pg

28).

8. Mount the coupling guard.

The coupling guard must always be mounted
after aligning the coupling.

DANGER

Risk of death due to rotating parts!

► Use personal protective equipment

when performing work on the pump.

► Prevent the keys from being slung

away when checking the direction of
rotation.

► Ensure sufficient clearance to rotating

parts.

DANGER

Never operate the pump without the cou­pling guard.

5.3.2 Vertical configuration

Vertical pumps are always delivered with a

complete coupling (assembled on the
pump).

1. Apply a very thin layer of molybdenum
disulphide (e.g. Molykote) to the shaft
ends on the pump.

2. Insert the keys.

3. If using fitting device, remove the rub­ber buffer and heat the two halves of
the coupling to around 100 °C.

4. Push the pump-side and motor-side
coupling halves onto the shaft until the
shaft end is flush with the coupling
hub. When assembled, maintain a dis­tance of 4 - 5 mm between the cou­pling halves.

5. Tighten the grub screw on the motor­side coupling half.

6. Place the motor on the pump. Ensure
here that both halves of the coupling fit
securely.

7. Secure the motor to the pump with
screws.

The coupling guard must always be mounted
after aligning the coupling.

5 Assembly and installation

28 NMH/NMV High Pressure Centrifugal Pump

DANGER

Risk of death due to rotating parts!

► Use personal protective equipment

when performing work on the pump.

► Prevent the keys from being slung

away when checking the direction of
rotation.

► Ensure sufficient clearance to rotating

parts.

DANGER

Never operate the pump without the cou­pling guard.

5.4 Aligning the motor

Horizontal configuration only. Alignment

options:

- with shims

- with adjustment screws

5.4.1 Aligning the motor with shims

1. Align the motor so that the two halves
of the coupling are precisely flush, us­ing shims if necessary.

2. Check the alignment of the motor to
the pump.

3. If the height displacement persists, re­peat the alignment process.

4. Afterwards, tighten the motor screws.

5.4.2 Aligning the motor with adjust­ment screws

Observe the spindle's angle of rotation
when adjusting the adjustment screws.

Figure 20: Aligning the motor with adjustment screws

1. Determine the angle required for the
wrench rotations for the measured
height displacement.

2. Loosen the hexagon head bolt (1)

5 Assembly and installation

NMH/NMV High Pressure Centrifugal Pump 29

3. Perform the following steps on all ad­justment screws (3):

- Hold the adjustment screw (3) at
the hexagon head (2) and loosen
the lock nut (4).

- Adjust the adjustment screw (3) by
the required angle.

- Hold the adjustment screw (3) at
the hexagon head (2) and tighten
the lock nut (4).

4. Tighten the hexagon head bolt (1).

5. Check the alignment.

6. If the height displacement persists, re­peat the alignment process.

7. Afterwards, tighten the motor screws.

5.5 Planning pipelines

5.5.1 General

Determine the nominal widths of the pipelines,
taking the local conditions into account. To
keep flow losses to a minimum, avoid sudden
constrictions and sharp bends. Route pipelines
free of tension and pressure tight. Install them
in a way that prevents forces and torques be­ing transferred to the pump. Never use the
pump as an anchor point for the pipeline.

Fit the suction pipe rising to the pump and the
inlet pipe declining to the pump, in order to
prevent the formation of air bubbles. Support
the pipes immediately before the pump, and
connect without tension. Ensure that the
weight of the pipes does not strain the pump. If
using short pipes, the nominal widths must be
at least equal to those of the pump connec­tions. If using long pipelines, determine the
cost-effective nominal width on a case-by-case
basis.

CAUTION

Before commissioning new systems, the
tanks, pipelines and connections must be
thoroughly cleaned, flushed and blown
through. Welding beads, scales and other
contaminations often only fall off after a
longer period of time. Ensure that they are
kept away from the pump by fitting a
strainer in the suction pipe.

Taper pieces to larger nominal widths should
have an extending angle of approx. 8° to pre­vent increased pressure losses. Install check
valves and shut-off devices depending on the
type of system and pump (à Figure 21, pg

29).

Take appropriate measures to compensate
any expansions of the pipelines caused by
temperature influences, in order to avoid
straining the pump with forces and torques.

Figure 21: Functional and operating elements

5 Assembly and installation

30 NMH/NMV High Pressure Centrifugal Pump

Key:

1 Eccentric taper piece

2 Shut-off valve

3 Suction pipe

4 Elbow

5 Foot valve with inlet strainer

6 Inlet pipe

7 Check valve

8 Control fitting

* not included in delivery

Control fitting

(à Figure 21, pg 29, 8)

A control fitting is always required to regulate
the pump power and block the pipeline during
assembly work.

Check valve

(à Figure 21, pg 29, 7)

A check valve is always required to protect the
pump.

Monitoring fitting

Monitoring fittings are required to monitor the
suction and inlet pressure. Monitoring valves
help monitor the operating data.

Flushing the shaft seal

If the pumping medium is contaminated, we
recommend flushing the shaft seal. This pre-

vents contamination from penetrating the shaft
seal, and therefore also prevents excessive
wear.

Sealing and flushing fluid pressure

The pressure of sealing and flushing fluid
should always be 1 bar above the pump oper­ating pressure.

Sealing the shaft seal

Sealing the shaft seal prevents air entry at high
suction heads.

Leak fluid (leakage)

Drain leak fluid using pipes or hoses.

Auxiliary pipes

Route auxiliary pipes according to their nomi­nal connection values, provided that they are
not pressurized internally by the pump. The
connections on the pump are indicated. All
auxiliary pipes must have a control fitting and
non-return valve.

The use of pumps in ATEX zones is subject
to additional requirements!

à 9.1.3 Installation and connection, pg 57

5 Assembly and installation

NMH/NMV High Pressure Centrifugal Pump 31

5.5.2 Avoiding contaminations in the
pipelines

1. Clean all pipeline components and fit­tings prior to assembly.

2. Ensure that gaskets do not protrude
inwards.

3. Remove any blank flanges, plugs, pro­tective films and/or protective coatings
on flanges.

NOTICE

Material damage due to contamination in
the pump!

► Ensure that the pump is free of contamina-

tions.

5.5.3 Configuring supports and flange
connections

NOTICE

Material damage due to excessively high
forces and torques in the pipes acting on
the pump!

► Do not exceed the permitted values.

1. Calculate the forces in the pipeline and
observe all operating conditions:

- cold/warm

- empty/filled

- pressurized/unpressurized

- change in the flange position

2. Ensure that the pipeline supports have
permanent low-friction properties and
do not seize up due to corrosion.

5.5.4 Determining nominal widths

Keep the flow resistance as low as possi­ble.

1. Set the nominal width of the suction
pipe to be greater than that of the suc­tion nozzle.

2. Set the nominal width of the suction
pipe to be greater than that of the suc­tion nozzle.

3. The flow rate may not exceed 1.5 m/s.

5.5.5 Determining pipeline lengths

Figure 22: Recommended straight pipeline lengths

upstream and downstream of the pump

5 Assembly and installation

32 NMH/NMV High Pressure Centrifugal Pump

A > 5x DNs

B DNs

C DNd

D > 5x DNd

Ensure compliance with the recommended
pipeline lengths when installing the pump.

Suction side: Shorter lengths are

possible, but this may limit the hydraulic
performance data.
Pressure side: Shorter lengths are
possible, but this may lead to increased
noise levels.

5.5.6 Optimizing changes in cross­section and direction

1. Avoid bend radii that are smaller than

1.5 times the nominal pipe width.

2. Avoid sudden changes to the cross­section along the pipeline.

5.5.7 Providing safety and monitoring
systems (recommended)

Preventing contamination

1. Install a filter in the suction pipe.

2. Install a differential pressure display
with contact manometer to monitor
contamination.

Preventing backflow

Install a non-return valve between the dis­charge nozzle and the shut-off valve to prevent
medium backflow after the pump is switched
off.

Enabling separation and blocking of the
pipelines

For maintenance and repair work.

1. Provide shut-off devices in the suction
and pressure pipe.

2. Recommended: Provide a drainage
mechanism.

Enabling measurement of operating condi­tions

1. Provide manometers in the suction
and pressure pipe to measure pres­sure.

2. Provide a torque measurement in­strument on the motor side.

3. Provide a temperature measurement
instrument on the pump side.

5.6 Attaching the pipelines

5.6.1 Installing auxiliary pipelines

Observe the manufacturer information for
any auxiliary operating systems, if used.

5 Assembly and installation

NMH/NMV High Pressure Centrifugal Pump 33

1. Install auxiliary pipelines to the auxilia­ry connections, sealed and without
tension (à Installation plan).

2. Prevent air pockets by routing the
pipelines rising to the pump.

5.6.2 Installing the suction pipe

1. Remove transport and sealing caps on
the pump.

2. Fit the filter in the suction pipe to pre­vent contamination.

3. Prevent air pockets by routing the
pipeline rising to the pump.

4. Ensure that the gaskets do not pro­trude inwards.

5. During suction operation, install a foot
valve in the suction pipe to prevent the
pump and suction pipe from emptying
when not in operation.

NOTICE

Always open the suction-side fitting when
operating the pump, and do not use it to
control the flow rate.

5.6.3 Installing the pressure pipe

1. Remove transport and sealing caps on
the pump.

2. Prevent air pockets by routing the
pipeline constantly declining to the
pump.

3. Ensure that the gaskets do not pro­trude inwards.

5.6.4 Checking for lack of tension in
the pipeline connection

ü Pipeline routed and cooled

1. Disconnect the connection flange of
the pipelines from the pump.

2. Check whether the pipeline can move
freely in all directions in the expected
area of expansion:

- Nominal width < 150 mm: by hand

- Nominal width > 150 mm: with

small lever

3. Ensure that the flanges are plane par­allel.

4. Reconnect the connection flange of
the pipelines to the pump.

NOTICE

Material damage due to excessively high
forces and torques in the pipes acting on
the pump!

► Do not exceed the permitted values.

5 Assembly and installation

34 NMH/NMV High Pressure Centrifugal Pump

5.7 Electrical connection

CAUTION

Electrical connection must be carried out
by a specialist electrician, in line with the
specifications of the local energy supplier
or the VDE.

DANGER

Risk of death from electric shock!

► Only allow work on the electrical systems to

be carried out by a qualified electrician.

► Ensure that the supply of electricity is

switched off and secured against reactiva­tion when performing all maintenance work.

DANGER

Risk of death due to rotating parts!

► Use personal protective equipment when

performing work on the pump.

► Prevent the keys from being slung away

when checking the direction of rotation.

► Ensure sufficient clearance to rotating

parts.

5.7.1 Connecting the motor

Observe the manufacturer information for
the motor.

Only use approved motors when operating
pumps in ATEX zones!

Install a motor protection switch to protect the
motor. If using three-phase motors with star­delta switch, ensure that the switching points
between star and delta are timed very closely
together. Longer switching times can lead to
damage to the pump.

1. Connect the motor according to the
circuit diagram.

5 Assembly and installation

NMH/NMV High Pressure Centrifugal Pump 35

2. Ensure that no danger arises due to
electrical energy.

3. Install an EMERGENCY STOP switch.

4. Adjust the time relay to the motor
power accordingly.

Adjusting the time relay with star-delta activa­tion:

Motor power

Time relay setting

≤ 30 kW

3 s 30%

> 30 kW

5 s 30%

Table 12: Settings for the time relay when using three-

phase motors with star-delta switch

NOTICE

Material damage due to improper use of
three-phase motor with star-delta switch!

► Adjust the time relay according to the motor

power (à Table 12, pg 35).

5.7.2 Earthing the pump

Always earth pumps in ATEX zones!

· Ensure that motors, couplings and
monitoring devices provided by the
customer meet the specified category
and temperature class in the respec­tive ATEX zone (à 9.1.2 Explosion
protection marking, pg 56).

· Only use touch guard elements (e.g.
coupling guard) made from electrically
conductive materials.

· The motor must meet the require-
ments of the area at risk of explosion
(group, category).

· If using a frequency inverter, please
consult the manufacturer of the pump
and the frequency inverter beforehand.

Earth the motor and the pump separately from
each other.

Figure 23: NMH earthing screws

Figure 24: NMV earthing screws

For information on measures for earthing the
motor, please refer to the manufacturer's doc­umentation.

6 Commissioning/decommissioning

36 NMH/NMV High Pressure Centrifugal Pump

6 Commissioning/
decommissioning

6.1 Commissioning

6.1.1 Determining the pump configura­tion

DANGER

Risk of explosion!

► Ensure that no pumps with gland packing

are used in areas at risk of explosion.

► Determine the pump configuration (à Or-

der data sheet)

Pump configurations relate to the type of

shaft seal or auxiliary operating system, for
example.

The use of pumps in ATEX zones is subject
to additional requirements!

à 9.1.4 Operation, pg 59

6.1.2 Filling the pump

ü Auxiliary operating system ready

ü Preservative removed

(à 5.1.3 Removing the preservative,

pg 22)

1. Fill the pump and suction pipe with
pumping medium.

2. Open the suction-side fitting.

3. Open the pressure-side fitting.

4. Open the auxiliary operating systems
(if present) and check for flow.

5. Ensure that all connections and joints
are sealed.

CAUTION

Check that there is enough water in the well
or feed tank.

Do not operate the pump without water. Dry
running can lead to damage to the pump.

6 Commissioning/decommissioning

NMH/NMV High Pressure Centrifugal Pump 37

WARNING

Risk of poisoning or injury due to hazard­ous pumping media!

► Collect any escaping pumping medium

safely and dispose of in an environmentally
friendly way.

NOTICE

Material damage due to dry running!

► Ensure that the pump is properly filled.

6.1.3 Checking direction of rotation

CAUTION

Incorrect direction of rotation on the pump
can lead to damage to the mechanical seal
and a reduction in performance. Please
observe the direction of rotation arrow on
the pump.

The cast direction of rotation arrow on the
pump indicates the specified direction of rota­tion.

Before checking the direction of rotation, se­cure the pump against activation.

1. Decouple the motor from the pump.

2. Switch the motor on and immediately
off again.

3. Check whether the motor's direction of
rotation corresponds to the arrow on
the pump.

4. If the direction of rotation is different,
reverse this by swapping two phases.

5. Recouple the motor with the pump.

6. Mount the coupling guard.

DANGER

Risk of death due to rotating parts!

► Use personal protective equipment when

performing work on the pump.

► Prevent the keys from being slung away

when checking the direction of rotation.

► Ensure sufficient clearance to rotating

parts.

After checking the direction of rotation, ensure
that all safety and protective mechanisms are
reinstalled and reactivated.

6 Commissioning/decommissioning

38 NMH/NMV High Pressure Centrifugal Pump

DANGER

Never operate the pump without the cou­pling guard.

6.1.4 Starting the pump

Pump correctly installed and connect-

ed

Motor correctly installed and connect-

ed

Motor correctly installed and aligned

All connections established, sealed

and free of tension

ü Any auxiliary operating systems ready

All safety mechanisms installed and

function tested

Pump correctly prepared, filled and

vented

DANGER

Risk of injury due to running pump!

► Do not touch the running pump.

► Do not perform any work on the running

pump.

DANGER

Risk of poisoning or injury due to spurting
pumping medium!

► Use personal protective equipment when

performing work on the pump.

NOTICE

Material damage due to dry running!

► Ensure that the pump is properly filled.

6 Commissioning/decommissioning

NMH/NMV High Pressure Centrifugal Pump 39

NOTICE

Open the suction-side fitting, and do not
use it to control the flow rate. Do not close
the pressure-side fitting!

Do not open the pressure-side fitting above the
operating point (à 3.6 Minimum output rates,
pg 15).

0.1 MPa = 1 bar ≈ 10 m

1. Open the suction-side fitting.

2. Close the pressure-side fitting.

3. Switch on the motor and ensure that it
runs quietly.

4. Once the motor has reached its nomi­nal speed, slowly open the pressure­side fitting until the operating point is
reached.

5. Ensure a temperature increase of < 50
°C/h if using the pump with hot pump­ing medium.

6. After the first pressure and tempera­ture loads, check whether the pump is
tight.

7. If using hot pumping media, switch the
pump off briefly when at operating
temperature, check the coupling
alignment and realign the motor if
necessary (à 5.4 Aligning the motor,
pg 28).

8. Set a slight leakage on the gland pack-

ing, if present (à 6.5.2 Gland packing,
pg 42).

6.2 Decommissioning

DANGER

Risk of injury due to hot pump compo­nents!

► Use personal protective equipment when

performing work on the pump.

DANGER

Risk of injury due to running pump!

► Do not touch the running pump.

► Do not perform any work on the running

pump.

6 Commissioning/decommissioning

40 NMH/NMV High Pressure Centrifugal Pump

WARNING

Risk of poisoning or injury due to hazard­ous pumping media!

► Use personal protective equipment when

performing work on the pump.

► Take the following measures in the event of

operating interruptions:

Flow medium
behavior

Duration of operating inter­ruption (depending on pr

o-

cess)

short

long

Solid compo­nents settle

► Flush

pump.

► Flush

pump.

Solidified/frozen,
non

-corrosive

► Heat or

drain pump
and contain­ers.

► Drain pump

and contain­ers.

Solidified/frozen,
corrosive

► Heat or

drain pump
and contain­ers.

► Drain pump

and contain­ers.
► Apply pre­servative to
pump and
containers.

Remains fluid,
non-corrosive

– –

Remains fluid,
corrosive

–

► Drain pump

and contain­ers.
► Apply pre­servative to
pump and
containers.

Table 13: Measures depending on the behavior of

the pumping medium

Pump to be

Measure

Shut down for
longer period

► Take measures according to the

pumping medium

Drained

► Close suction and pressure-side
fittings.

Disassembled

► Deactivate the motor and se­cure against unauthorized reactiva­tion.

Put into stor­age

► Observe the storage measures
(→

4.3 Storage, pg 19).

Table 14: Measures in the event of

operational interruption

Drain the pump completely if shutting down for
a longer period (approx. 2 - 3 months), or if
there is a danger of frost.

NOTICE

This work must be carried out by a special­ist service provider.

CAUTION

Disconnect the pump from the electricity
supply if shutting down for a longer period.

6 Commissioning/decommissioning

NMH/NMV High Pressure Centrifugal Pump 41

6.2.1 Switching off the pump

1. Pressure-side fitting closed (recom­mended)

2. Switch off the motor.

3. Check all tie bolts and tighten if nec­essary.

6.2.2 Draining the pump and protecting
against frost

The pump must be drained if there is a danger
of frost. A pump that remains empty over a
longer period must be preserved.

6.3 Recommissioning

CAUTION

The pump must move easily for recommis­sioning.

Check that the pump moves easily before re­commissioning.

If the pump was preserved after decommis­sioning, flush it thoroughly before recommis­sioning.

Perform all further work steps in line with 6.1
Commissioning, pg 36.

Take the following measures before recom­missioning following operating interruptions of
> 1 year:

Shut down
time

Measure

> 1 year

► Check visually for leaks

> 2 years

Replace elastomer seals
(gaskets, round seals, shaft seal
rings and gland packings).
► Replace anti-friction bearings.

Table 15: Measures following longer shut down times

6.4 Operating the stand-by pump

ü Stand-by pump filled and vented

Operate the stand-by pump at least once
per week.

1. Open the suction-side fitting fully.

2. Open the pressure-side fitting as far as
required for the stand-by pump to
reach operating temperature and be
evenly warmed through (à 6.1.4 Start­ing the pump, pg 38).

6 Commissioning/decommissioning

42 NMH/NMV High Pressure Centrifugal Pump

6.5 Shaft seal

6.5.1 Mechanical seal

NOTICE

Material damage due to dry running!

► Ensure that the pump is properly filled.

Mechanical seals are self-adjusting mechani­cal shaft seals that require no maintenance.
The mechanical seal must never run dry. En­sure therefore that the pump is filled.

Do not reinstall mechanical seals after remov­ing them for inspection or maintenance. Re­place them with new seals, or relap the contact
surface.

6.5.2 Gland packing

Gland packing consists of a number of com­pression-moulded rings in a stuffing box.
Gland packings can be adjusted by hand with
tools.

WARNING

Excessive tightening places too much ten­sion on the packing rings. This leads to
wear and ultimately loss of tightness in the
stuffing box.

Replace the gland packing if the leaks in the
stuffing box persist. Check at the same that the
shaft wearing sleeves are in a good condition.
Any worn or scored shaft wearing sleeves can
lead to premature destruction of the packing.

NOTICE

Material damage due to dry running!

► Ensure that the pump is properly filled.

7 Maintenance and repair

NMH/NMV High Pressure Centrifugal Pump 43

7 Maintenance and repair

7.1 General information

We can provide trained customer service

technicians for assembly and repair work.
Please present proof of the conveyed
goods upon request.

(DIN safety data sheet or clearance certifi­cate)

DANGER

Risk of injury due to hot pump compo­nents!

► Use personal protective equipment when

performing work on the pump.

DANGER

Risk of injury due to running pump!

► Do not touch the running pump.

► Do not perform any work on the running

pump.

WARNING

Risk of poisoning or injury due to hazard­ous pumping media!

► Use personal protective equipment when

performing work on the pump.

Ensure that the pump runs smoothly and quiet­ly at all times. Maximum permitted room tem­perature 40 °C.

The mechanical seal displays only limited or
invisible leakage losses (in vapor form). It re­quires no maintenance.

The reserve pumps must be activated once
per week in order to ensure operational readi­ness. To do so, switch the reserve pumps on
and immediately off again. Monitor the function
of the additional connections.

The pump shaft of the NMV series is support­ed in the suction casing in a zero-maintenance
bearing shell made from PTFE graphite. The
pump shaft and motor shaft are connected
rigidly by means of a muff coupling.

7 Maintenance and repair

44 NMH/NMV High Pressure Centrifugal Pump

7.2 Operational monitoring

Ensure that the pump runs smoothly and quiet­ly at all times. Maximum permitted room tem­perature 40°C. The bearing temperature may
be up to 50°C above the room temperature,
but may not exceed 90°C (measured externally
on the bearing housing).

NOTICE

Material damage due to dry running!

► Ensure that the pump is properly filled.

► Longer operation against a closed shut-off

device is not permitted.

If using a gland packing, this should drip slight­ly during operation. The gland may only be
tightened slightly. Leakage is always required
if using pure graphite packing rings. If leakage
is too high after a longer period of operation,
evenly tighten the nuts on the gland by 1/6 of a
rotation, and observe the leakage. If it is no
longer possible to adjust the gland, insert an
additional packing ring. It is generally not re­quired to replace the entire packing.

If using mechanical seals, these display only
limited or invisible leakage losses (in vapor
form). They require no maintenance.

The reserve pumps must be activated once
per week in order to ensure operational readi­ness. To do so, switch the reserve pumps on
and immediately off again. Monitor the function
of the additional connections.

Replace the elastic elements of the coupling
promptly should you notice signs of wear over
time.

The bearings have a high-quality lithium-soap
grease. Under normal operating conditions,
this is sufficient for 15,000 operating hours or 2

years. If operating under unfavorable condi­tions, such as high room temperature, high
humidity, dusty air, aggressive industrial at­mospheres, etc., check the bearings at an
earlier time, and clean and relubricate if nec­essary. When relubricating, use a lithium-soap
grease that is free of resins or acids, does not
become brittle and protects against rust.

Only half fill the cavities of the bearings with
grease. If necessary, you can also lubricate
the bearings with other soap-based greases.
As greases with different soap bases may not
be mixed, ensure that the bearings are thor­oughly washed beforehand. Adjust the neces­sary relubrication intervals according to the
greases used.

1. Test at appropriate intervals:

- Maintenance of the minimum flow
rate

- Room temperature < 40 °C

- Temperature of the anti-friction

bearings < 90 °C
(measured on the bearing hous­ing)

- No change in the normal operating
conditions

- Alignment of the coupling and
condition of the elastic elements

2. Please ensure the following for smooth
operation:

- No dry running

- No leaks

- No cavitation

- Gate valve open on suction side

- Filter free and clean

- Sufficient inlet pressure

- No unusual running noises or vi-

brations

- No unpermitted leakage on the
shaft seal

- Auxiliary operating systems func­tion correctly

7 Maintenance and repair

NMH/NMV High Pressure Centrifugal Pump 45

The use of pumps in ATEX zones is subject
to additional requirements!

à 9.1.4 Operation, pg 59

7.3 Maintenance

Service life of the anti-friction bearings in

the permitted operating range: > 2 years

Intermittent operation, high temperatures,

low viscosity and unfavorable ambient and
process conditions can reduce the service
life of the anti-friction bearings.

Mechanical seals wear naturally, although

this depends heavily on the respective op­erating conditions. It is therefore not possi­ble to make any general statements about
the service life.

DANGER

Risk of death from electric shock!

► Only allow work on the electrical systems to

be carried out by a qualified electrician.

► Ensure that the supply of electricity is

switched off and secured against reactiva­tion when performing all maintenance work.

DANGER

Risk of injury due to hot pump compo­nents!

► Use personal protective equipment when

performing work on the pump.

DANGER

Risk of injury due to running pump!

► Do not touch the running pump.

► Do not perform any work on the running

pump.

WARNING

Risk of poisoning or injury due to hazard­ous pumping media!

► Use personal protective equipment when

performing work on the pump.

7 Maintenance and repair

46 NMH/NMV High Pressure Centrifugal Pump

The use of pumps in ATEX zones is subject
to additional requirements!

à 9.1.5 Maintenance and repair, pg 59

Ensure compliance with the following addi­tional requirements when operating the
pump in an ATEX zone:

· Replace the anti-friction bearing in the
motor in line with the manufacturer
specifications.

· Replace the anti-friction bearing and
the plain bearing in the pump after
9000 operating hours.

· Check the following at appropriate in-
tervals (at least monthly):

- Motor and coupling in line with the
manufacturer's operating manual

- Surface temperature of the motor
and pump

- Any changes in running noise or
vibrations

- Deformation of the touch guard el­ements and distance to the haz­ardous parts

- Function of the monitoring devices

Always earth pumps in ATEX zones!

7.3.1 Anti-friction bearings and grease
lubrication

Relubricate after no more than 7500 operat­ing hours or 1 year under normal operating
conditions.

1. Clean the anti-friction bearings thor­oughly.

2. Use grease with the following proper­ties:

- lithium soap base

- free of resins

- free of acids

- anti-rust effect

- non-drying

3. Only half fill the cavities in the anti­friction bearings with grease.

7.3.2 Servicing the electric motors

CAUTION

Electrical connection must be carried out
by a specialist electrician, in line with the
specifications of the local energy supplier
or the VDE.

7 Maintenance and repair

NMH/NMV High Pressure Centrifugal Pump 47

DANGER

Only perform the inspection when the sys­tem is switched off and secured.

DANGER

Risk of death from electric shock!

► Only allow work on the electrical systems to

be carried out by a qualified electrician.

► Ensure that the supply of electricity is

switched off and secured against reactiva­tion when performing all maintenance work.

7.3.3 Servicing the mechanical seals

Mechanical seals feature a functional drop

leak (à manufacturer information)

Mechanical seals are self-adjusting mechani­cal shaft seals that require no maintenance.
The mechanical seal must never run dry. En­sure therefore that the pump is filled.

Do not reinstall mechanical seals after remov­ing them for inspection or maintenance. Re­place them with new seals, or relap the contact
surface.

Ø In the event of heavy leakage, replace

the mechanical seal with auxiliary
seals and check that the auxiliary op­erating systems function properly.

7.3.4 Servicing the gland packing

Gland packing consists of a number of com­pression-moulded rings in a stuffing box.
Gland packings can be adjusted by hand with
tools.

WARNING

Excessive tightening places too much ten­sion on the packing rings. This leads to
wear and ultimately loss of tightness in the
stuffing box.

NOTICE

Material damage due to dry running!

► Ensure that the pump is properly filled.

If using a gland packing, this should drip slight­ly during operation. The gland may only be
tightened slightly. Leakage is always required
if using pure graphite packing rings. If leakage
is too high after a longer period of operation,
evenly tighten the nuts on the gland by 1/6 of a
rotation, and observe the leakage. If it is no

7 Maintenance and repair

48 NMH/NMV High Pressure Centrifugal Pump

longer possible to adjust the gland, insert an
additional packing ring or replace the packing
rings.

Figure 25: Pressure-side stuffing box (standard)

Replacing the packing rings:

1. Remove the old gland packing entirely
and clean the stuffing box.

2. Check the surface quality of the shaft
running surface.

3. Place new rings around the shaft.
When doing this:

- push in each new ring with the
gland

- rotate each new ring until the joints
are offset by 90°

4. Slightly tighten the nuts on the gland
by hand, alternating sides. Ensure that
the pump shaft rotates easily.

Figure 26: Suction-side stuffing box (standard)

Pump type

Dimensions [mm]

D d S

NMH/NMV 32

51

35

8

NMH/NMV 40

51

35

8

NMH/NMV 50

63

43

10

NMH/NMV 65

65

45

10

NMH/NMV 80

85

60

12

Table 16: Stuffing box dimensions

7.4 Sending the pump to the manu­facturer

ü Pump depressurized

ü Pump completely drained

ü Electrical connections disconnected

and motor secured against reactivation

ü Pump cooled down

ü When using couplings with spacer:

spacer removed

7 Maintenance and repair

NMH/NMV High Pressure Centrifugal Pump 49

ü Auxiliary operating system shut down,

depressurized and drained

ü Manometer removed together with

supply lines and holders

1. Only send pumps or individual compo­nents to the manufacturer together
with a verifiable and completely filled
out clearance certificate. Request a
clearance certificate from the manu­facturer if required.

2. Using the following table, take the ac­tion required for returning the pump
according to the necessary repair.

Repair

Action for return

At customer

►Return defective component

to manufacturer.

At manufacturer

►Flush pump.
►Send complete pump

(not disassembled) to ma

n-

ufacturer.

At manufacturer,
with guarantee
claim

►Only when using hazardous

pumping medium: flush

pump.

►Send complete pump

(not disassembled) to ma

n-

ufacturer.

Table 17: Measures for return

7.5 Disassembling the pump

DANGER

Risk of death from electric shock!

► Only allow work on the electrical systems to

be carried out by a qualified electrician.

► Ensure that the supply of electricity is

switched off and secured against reactiva­tion when performing all maintenance work.

DANGER

Risk of injury due to hot pump compo­nents!

► Use personal protective equipment when

performing work on the pump.

7 Maintenance and repair

50 NMH/NMV High Pressure Centrifugal Pump

DANGER

Risk of injury due to running pump!

► Do not touch the running pump.

► Do not perform any work on the running

pump.

WARNING

Risk of poisoning or injury due to hazard­ous pumping media!

► Use personal protective equipment when

performing work on the pump.

ü Pump depressurized

ü Pump fully drained, flushed and de-

contaminated

ü Electrical connections disconnected

and motor secured against reactivation

ü Pump cooled down

ü Coupling guard removed

ü When using couplings with spacer:

spacer removed

ü Auxiliary operating system shut down,

depressurized and drained

ü Manometer removed together with

supply lines and holders

During disassembly:

· Precisely mark the installation location
and position of all components prior to
disassembly.

· This assembled components concen-
trically, and do not cant.

· Disassemble the pump (à Cross-
section diagram).

7 Maintenance and repair

NMH/NMV High Pressure Centrifugal Pump 51

7.6 Ordering spare parts

Please have the following information to hand
when ordering spare parts (à type plate,
cross-section diagram):

· Customer number (if available)

· Short designation of the pump series

· Order number/pump number

· Year of production

· Parts number

· Designation

· Quantity

· Delivery method

· Delivery address

8 Faults and troubleshooting

52 NMH/NMV High Pressure Centrifugal Pump

8 Faults and troubleshooting

Please consult the manufacturer should you
experience any faults that are not described in
the following table, or cannot be traced back to
the described causes.

In the following table, each potential fault is
given a number. Use this number to find the
corresponding cause and remedy in the trou­bleshooting table.

Fault

Number

Pump does not deliver

1

Flow rate too low

2

Flow rate too high

3

Pumping pressure too low

4

Pumping pressure too high

5

Pump runs noisily

6

Temperature of the anti-friction bearings
too high

7

Pump leaks

8

Motor power consumption too high

9

Table 18: Fault/number allocation

Fault number

Cause

Remedy

1 2 3 4 5 6 7 8 9

X - - - - - - - -

Inlet/suction pipe and/or pressure
pipe closed by fitting

► Open fitting.

- X - X - - - - -

Inlet/suction pipe not completely
opened

► Open fitting.

X X - X - X - - -

Inlet/suction pipe, pump or suction
strainer blocked or encrusted

► Clean inlet/suction pipe, pump or

suction strainer.

- X - X - X - - -

Cross-section of the inlet/suction
pipe too tight

► Enlarge cross

-section.

► Clean suction pipe of encrustations.

► Fully open fitting.

X - - - - - - - -

Transport sealing cap not r

e-

moved

► Remove transport sealing cap.

► Disassemble pump and check for

dry running damage.

- X - X - X - - -

Suction head too high: NPSH

pump

is greater than NPSH

system

► Increase inlet pressure.

► Consult manufacturer.

X - - - - X - - -

Inlet/suction pipe and pump not
correctly drained or not complete­ly filled.

► Completely fill and drain pump

and/or pipeline.

X - - - - X - - -

Inlet/suction pipe contains air
pockets

► Install fitting for venting.

► Correct pipeline routing.

X X - X - X - - -

Air sucked in

► Seal source of fault.

X X - X - X - - -

Gas component too high: pump
cavitated

► Consult manufacturer.

- X - X - X - - -

Temperature of pumping medium
too high: pump cavitated

► Increase

inlet pressure.

► Reduce temperature.

► Consult manufacturer.

8 Faults and troubleshooting

NMH/NMV High Pressure Centrifugal Pump 53

Fault number

Cause

Remedy

1 2 3 4 5 6 7 8 9

- X - X - - - - -

Geodetic delivery head and/or
pipeline resistance too high

► Remove deposits in pump and/or

pressure pipe.

► Install larger impeller and consult
manufacturer.

- X - - X X - - -

Pressure-side fitting not opened
far enough

► Open pressure

-side fitting.

X X - - X X - - -

Pressure line blocked

► Clean pressure line.

X X - X - X - - -

Incorrect direction of rotation on
pump

►

Swap any two phases on motor.

X X - X - - - - -

Speed too low

► Compare required motor speed with

pump type plate. Replace motor if nec­essary.

► Increase speed if possible.

- X - X - X X - -

Pump components worn

► Replace worn pump components.

- - X X - X - - X

Pressure-side fitting opened too
far

► Throttle with pressure

-side fitting.

► Machine down impeller. Consult

manufacturer and adjust impeller diam­eter.

- - X - - X - - X

Geodetic delivery head, pipeline
resistance and/or other resistanc­es lower

than designed

► Throttle flow rate with pressure-side

fitting. Observe minimum flow rate here.

► Machine down impeller. Consult

manufacturer and adjust impeller diam­eter.

- - X - X - - - -

Viscosity lower than indicated

► Machine down impeller. Consult

manufacturer and adjust impeller diam­eter.

- - X - X X X - X

Speed too high

► Compare required motor speed with

pump type plate. Replace motor if nec­essary.

► Reduce speed if possible.

- - X - X X - - X

Number of stages too high

► Throttle flow rate with

pressure-

side

fitting. Observe minimum flow rate here.

► Install pump with lower number of

stages.

X X - X - X - - -

Impeller imbalanced or blocked

► Disassemble pump and check for

dry running damage.

► Clean impeller.

- X - X - X - - -

Hydraulic pump components dirty,
sticky or encrusted

► Disassemble pump.

► Clean components.

- - - - - - X - X

Defective anti-friction bearing in
motor

► Replace anti

-friction bearing.

8 Faults and troubleshooting

54 NMH/NMV High Pressure Centrifugal Pump

Fault number

Cause

Remedy

1 2 3 4 5 6 7 8 9

- - - - - - X - -

Lubricant: too much, too little or
not suitable

► Reduce, increase or replace lubri­cant.

- - - - - - - X -

Tie bolts not tightened correctly

► Tighten tie bolts.

- - - - - - - X -

Mechanical seal worn

► Replace mechanical seal.

- - - - - - - X -

Defective casing seal

► Replace casing seal.

- - - - - - - X -

Shaft sleeve penetrated

► Replace shaft sleeve and round

seal.

- - - - - X X X X

Pump under tension

► Check pipeline connections and

pump fastening.

► Check coupling alignment.

► Check support foot fastening.

- - - - - X X - -

Coupling incorrectly aligned

► Align coupling.

- X - X - X - - X

Motor runs on 2 phases

► Check fuse and replace if necessary.

► Check wire connections and insula-

tion.

Table 19: Troubleshooting table

9 Appendix

NMH/NMV High Pressure Centrifugal Pump 55

9 Appendix

9.1 Additional ATEX instructions

Additional requirements for safe operation

in areas at risk of explosion

9.1.1 Safety

Correct and proper use:

The pump is classified as non-electric equip­ment, and therefore fulfills the requirements for
devices of equipment group II, categories 2
and 3.

Do not operate the pump:

- when the fittings are closed

- when the operating range is exceeded

(à data sheet)

- when maintenance intervals are ex­ceeded

Duties of the system owner:

· Assess and document the risk of ex-
plosion in the various operating areas
of the system according to Annex I of
the Directive 2014/34/EU.

· Ensure compliance with Directive
99/92/EC on measures for ensuring
the health and safety of workers in at­mospheres at risk of explosion.

· Only operate the pump in line with the
explosion protection marking.

· Observe the enclosed data sheet.

· Ensure the following at all times:

- Pump earthed (earthing screw lo-

cated on the bearing housing of
the pump) à 5.7.2 Earthing the
pump, pg 35

- No contact between the coupling
and the coupling guard

- Suction and pressure pipe, inside
of the pump, seal area and auxil­iary systems completely filled with
pumping medium at all times

- Authorized surface temperature
on the pump not exceeded

- Fittings installed correctly on the
suction and pressure side

- Pump serviced regularly and
monitored

- No risk of dry pump running, e.g.
via level monitoring or flow rate
measurement

· Ensure that motors, couplings and
monitoring devices provided by the
customer meet the specified category
and temperature class in the respec­tive zone.

· Inform personnel of the particular risk
of explosion when removing dust de­posits.

Materials and media:

Ensure the following:

· All attachment parts are electrically

conductive

· Electrostatic charging is avoided: Only

use pumping media with a conductivity
> 10-8 S/m.

Appendix

56 NMH/NMV High Pressure Centrifugal Pump

9.1.2 Explosion protection marking

ATEX marking

The pumps in the NMH/NMV series meet the
following ATEX Ex protection class:

II G 2 c T3

1 2 3 4 5 6

Key:

1 ATEX symbol

2 Equipment group 2

3 Gases

4 Category 2

5 Constructional safety

6 Temperature class 3

Temperature classes:

Flammable gases and vapors are divided

into temperature classes according to their
inflammability in contact with hot surfaces.

Tempera­ture class

Mixture ignition
temperature [°C]

Max. sur­face tem­perature
[°C]

T1

t > 450

450

T2

450 ≥ t > 300

300

T3

300 ≥ t > 200

200

T4

200 ≥ t > 135

135

T5

135 ≥ t > 100

100

T6

100 ≥ t > 85

85

Table 20: Temperature classes

DANGER

Only use the pump up to the temperature
class indicated on the type plate.

The surface temperature of the pump must
always be lower than the lowest ignition tem­perature of the temperature class.

Ignition protection class:

The ignition protection class describes the type
of measures taken to prevent a surrounding
explosive atmosphere from igniting.

Ign

i-

tion

pr

o-

tection

class

Meaning

For area

Non-

electri-

cal

equip

ment

Ele

c-

trical

equip

ment

b

Control of ignition
sources

X

-

c

Constructional safety

X

-

d

Flameproof enclosure

X

X

e

Increased safety

-

X

fr

Flow restriction

X

-

g

Inherent safety

X

-

k

Liquid immersion

X

-

o

Oil immersion

-

X

p

Pressurization

X

X

q

Powder filling

-

X

m

Encapsulation

-

X

i

Intrinsic safety

-

X

Table 21: Ignition protection classes

9 Appendix

NMH/NMV High Pressure Centrifugal Pump 57

Ex atmosphere

The Ex atmosphere describes the type of ex­plosive atmosphere in a zone.

Ex atmosphere

Meaning

G Flammable gases and vapors

D Flammable dusts

Table 22: Ex atmosphere

Equipment groups/areas of use/zone/cate­gory

Pumps are divided into equipment groups and
categories according to the area in which they
are used. The zone is based on the likelihood
of an explosive atmosphere, and differentiates
between gases and dusts. The category de­scribes the constructional safety of the pump,
and depends on the zone.

Equipment

group/area of

use

Zone

Category

Likelihood of dangerous explo-

sive atmospheres

Constructional safety

I / mining

Comparable to 0
(G) and 1 (G)

M1

-

Very high

I / mining

Comparable to 2
(G)

M2

-

High

II / others

0 (G) 20 (D)

1

Persistent, for long periods or
frequently

Very high

II / others

1 (G) 21 (D)

2

Occasional (arising fault must
not become source of ignition)

High

II / others

2 (G) 22 (D)

3

Unlikely, if so then rarely and
briefly (surface temperature
must not become an ignition
source in normal operation)

Normal

Table 23: Equipment groups/areas of use/zone/category

9.1.3 Installation and connection

The required measures for installation and

connection depend on the category (à

9.1.2 Explosion protection marking, pg 56).

Performing basic measures

· Only use touch guard elements (e.g.
coupling guard) made from electrically
conductive materials.

· Secure the grub screw for connecting
the coupling halves (e.g. using Loctite
medium strength)

· Remove any metal shavings and dirt
residues from all touch guard ele­ments.

· Install a soft-closing non-return valve
between the discharge nozzle and the
shut-off valve to prevent the backflow
of pumping medium after the pump is
switched off.

9 Appendix

58 NMH/NMV High Pressure Centrifugal Pump

· The motor must meet the require-
ments of the area at risk of explosion
(group, category).

· If using a frequency inverter, please
consult the manufacturers of the pump
and the frequency inverter beforehand.

Performing measures for category 2

Ensure that there are monitoring devices to
prevent self-warming caused by dry running.

Type and configura

tion of shaft seal

(

à data sheet)

Measure

Single mechanical seal

If the pumping medium contains gas

-laden substances:

► Ensure that the following components for temperature meas­urement on the stationary seal ring of the mechanical seal meet
the

specifications of Directive 2014/34/EU:

-

Temperature sensor on stationary seal ring of the mechan-

ical seal

- Temperature monitoring instrument

► Retrofit an appropriate temperature measuring instrument if

required

Double mechanical seal in back

-to-

back

configuration

► Retrofit a pressure gauge for the sealing medium

Double mechanical seal in tandem configu­ration

► Retrofit a fill level gauge for the supply tank if necessary.

► Retrofit a pressure gauge for the sealing medium if the tem-

perature difference between the sealing medium and the tem­perature class < 50 Kelvin.

Single mechanical seal with quench and
secondary seal with lip

Table 24: Possible devices for monitoring self-warming due to dry running

Monitoring the system for parameter be­havior

Parameter 1)

Measure

Constant

► Monitor motor power:

- Reaction time < 5 s

- Precision < 15 %

-

Record of the effective
power of all three phases

-

Monitoring of overload

and underload

► Alternatively: Monitor flow
rate and/or tank level (à data
sheet)

At least one not
constant

► Monitor flow rate and/or tank

level

- Reaction time < 5 s

-

Monitor minimum and

maximum value (à

data

sheet)

Table 25: Measures against unauthorized self-warming

1) Flow rate, delivery head, density, vis­cosity, speed, output

Ensuring ignition source monitoring

Ensure that ignition sources are monitored as
per the minimum requirements of the ignition
protection level (IPL) according to EN 13463-6
(or DIN EN ISO 13849-1 for monitoring devic­es that are not IPL certified):

IPL 1 for category 2

IPL 2 for category M2 / mining

9 Appendix

NMH/NMV High Pressure Centrifugal Pump 59

9.1.4 Operation

Observing the maximum authorized operat­ing temperature

Observe the maximum authorized operating
temperature (à data sheet).

Observing the maximum authorized tem­perature of the pumping medium

Temperature class

Authorized pumping me­dium temperature [°C] 1)

T4

80

T3

140

T2

140

T1

140

Table 26: Max. pumping medium temperature

1) Applies to the specific heat capacity of
water (c

Water

= 4.2 KJ/kgK) and at speeds

< 3000 min-1

Safe operation

Ensure the following operating conditions:

· No dry running

· No operation while overloaded

· No operation when the suction-side fit-

tings are closed

· No operation (even briefly when start-
ing) when the pressure-side fittings are
closed

9.1.5 Maintenance and repair

Maintenance intervals shorten under diffi­cult operating conditions.

Performing measures

· Replace the anti-friction bearing in the
motor in line with the manufacturer
specifications.

· Replace the anti-friction bearing and
the plain bearing in the pump after
9000 operating hours.

· Check the following at appropriate in-
tervals (at least monthly):

- Motor and coupling in line with the
manufacturer's operating manual

- Surface temperature of the motor
and pump

- Any changes in running noise or
vibrations

- Deformation of the touch guard el­ements and distance to the haz­ardous parts

- Function of the monitoring devices

9 Appendix

60 NMH/NMV High Pressure Centrifugal Pump

9.2 Spare parts list for constant operation over two years as per DIN 24296

Part no.

Part designation

Number of identical pumps

(including reserve pumps)

2 3 4 5 6 and 7

8 and 9

> 9

Set/quantity of spare parts

211

Pump shaft with small parts

1 1 2 2 2

3

30%

230

Impeller (set)

1 1 1 2 2

3

30%

321 Radial grooved ball bearing
(set)

1 1 2

2 3 4

50%
370

Foil bearing

1 1 2 2 3

4

50%

412

Round seal (set)

4 8 8 8 9

12

150%

433

Mechanical seal (set)

2 3 4 5 6

7

90%

461

Gland packing (set)

4 6 8 8 9

12

150%

504

Correction ring

1 1 2 2 3

4

50%

524

Shaft wearing sleeve

2 2 2 3 3

4

50%

525

Interstage sleeve

2 2 2 3 3

4

50%

Table 27: Spare parts for constant operation over two years

9 Appendix

NMH/NMV High Pressure Centrifugal Pump 61

9.3 Cross-sections

Figure 27: Cross-section of NMH with mechanical seal

9 Appendix

62 NMH/NMV High Pressure Centrifugal Pump

Figure 28: Cross-section of NMH with gland packing

9 Appendix

NMH/NMV High Pressure Centrifugal Pump 63

Part no.

Designation

Part no.

Designation

100

Casing

501

Multiple ring

106

Suction casing

502

Casing wear ring

107

Delivery casing

504

Correction ring

108

Stage casing

504/1

Spacer ring

171/1

Diffuser

504/2

Spacer ring

171/2

Diffuser

506

Retaining ring

507

Thrower

524

Shaft wearing sleeve

211

Pump shaft

525

Spacer sleeve

230/1

Impeller

550

Disc

230/2

Impeller

551

Support disc

321

Radial grooved ball bearing

636

Grease nipple

350

Bearing housing

360/1

Bearing cover

360/2

Bearing cover

901/1

Hexagon head bolt

901/2

Hexagon head bolt

902

Stud

400

Gasket

903/1

Screwed plug

412/1

O-ring

903/2

Screwed plug

412/2

O-ring

905

Tie bolt

433

Mechanical seal

920/1

Hexagon nut

920/2

Hexagon nut

921

Shaft nut

452

Gland

932

Circlip

459

Lantern neck bush

940/1

Key

461

Gland packing

940/2

Key

940/3

Key

940/4

Key

940/5

Key

Table 28: NMH parts list

9 Appendix

64 NMH/NMV High Pressure Centrifugal Pump

Figure 29: Cross-section of NMV with mechanical seal

9 Appendix

NMH/NMV High Pressure Centrifugal Pump 65

Figure 30: Cross-section of NMV with gland packing

9 Appendix

66 NMH/NMV High Pressure Centrifugal Pump

Part no.

Designation

Part no.

Designation

100

Casing

501

Multiple ring

106

Suction casing

502

Casing wear ring

107

Delivery casing

504

Correction ring

108

Stage casing

504/1

Spacer ring

171/1

Diffuser

504/2

Spacer ring

171/2

Diffuser

506

Retaining ring

181

Pump stool

507

Thrower

524

Shaft wearing sleeve

524/1

Shaft wearing sleeve

211

Pump shaft

524/2

Shaft wearing sleeve

230/1

Impeller

525/1

Spacer sleeve

230/2

Impeller

525/2

Spacer sleeve

545

Bearing bush

550

Disc

321

Radial grooved ball bearing

341

Motor stool

350

Bearing housing

636

Grease nipple

360

Bearing cover

370

Bearing shell

861/1

Pump-side coupling half

861/2

Motor-side coupling half

400

Gasket

412/1

O-ring

412/2

O-ring

901/1

Hexagon head bolt

433

Mechanical seal

901/2

Hexagon head bolt

901/3

Hexagon head bolt

902

Stud

452

Gland

903/1

Screwed plug

461

Gland packing

903/2

Screwed plug

905

Tie bolt

920/1

Hexagon nut

920/2

Hexagon nut

921

Shaft nut

932

Circlip

940/1

Key

940/2

Key

940/3

Key

940/4

Key

940/5

Key

Table 29: NMV parts list

9 Appendix

NMH/NMV High Pressure Centrifugal Pump 67

9.4 Declaration of Conformity as per EC Directive 2006/42/EC, Annex IIA

We hereby declare under our sole responsibility as manufacturer that the following machine series
conform to the relevant specifications of the EC Machinery Directive 2014/34/EC both in their type
and in the configurations distributed by us.

Designation: NMH/NMV 32/40/50/65/80

Pump number: 170000 - 200000

The machine also corresponds with the following directives published in the Official Journal of the
European Union:

· Niederspannungsrichtlinie (2014/35/EC)

This declaration shall cease to be valid in the event of any modifications to the machine and/or its
protective mechanisms not agreed with us and approved in writing.

Applied harmonized standards and their references in the Official Journal of the European Union:

· DIN EN 809 : 2012

· DIN EN ISO 12100 : 2011

· DIN EN ISO 13732 : 2008

· DIN EN ISO 13857 : 2008

· DIN EN 60034 : 2007

· DIN EN 60204-1 : 2009

Authorized representative for the composition of technical documentation for OSNA-Pumpen GmbH:

Mr. Rik Arensmann
Brückenstrasse 3
49090 Osnabrück, Germany

Osnabrück, 31.10.2016 _______________________________

Rik Arensmann

Technical Director/QM Officer

9 Appendix

68 NMH/NMV High Pressure Centrifugal Pump

9.5 Declaration of Conformity as per EC Directive 2014/34/EC, Annex VI

We hereby declare under our sole responsibility as manufacturer that the following machine series of
the type, as well as the configurations distributed by us, conform to the relevant specifications of the
EC Directive 2014/34/EC.

Designation: NMH/NMV 32/40/50/65/80

Pump number: 170000 - 200000

The machine corresponds to the following protection class:

II 2 G c T3

This declaration shall cease to be valid in the event of any modifications to the machine and/or its
protective mechanisms not agreed with us and approved in writing.

Applied harmonized standards and their references in the Official Journal of the European Union:

· DIN EN ISO 13463-1 : 2009

· DIN EN ISO 13463-5 : 2011

· DIN EN ISO 15198 : 2007

Authorized representative for the composition of technical documentation for OSNA-Pumpen GmbH:

Mr. Rik Arensmann
Brückenstrasse 3
49090 Osnabrück, Germany

Osnabrück, 24.02.2017 _______________________________

Rik Arensmann

Technical Director/QM Officer

9 Appendix

NMH/NMV High Pressure Centrifugal Pump 69

9.6 Clearance Certificate

Please copy and send with the pump.

Clearance Certificate

Legal provisions oblige all businesses to protect their employees, other persons and the environment
from damaging effects when handling hazardous substances. Products and their components may
therefore only be repaired or inspected when the following declaration has been fully and correctly
filled out and singed by an authorized and qualified specialist. Please provide the necessary infor­mation should safety measures on the part of the system owner still be required despite complete
draining and cleaning. This clearance certificate is part of the repair or inspection order.

We hereby assure that the enclosed device

Type: ______________________________________________________________

Serial no.: ______________________________________________________________

is free of substances that are hazardous to health. No special safety measures are required for further
handling. The device was fully drained and thoroughly cleaned inside and outside before dispatch.

Company/institute: ______________________________________________________________

Address: ______________________________________________________________

Town/city, ZIP code: ______________________________________________________________

Phone: ______________________________________________________________

Name: ______________________________________________________________

Position: ______________________________________________________________

Date: ______________________________________________________________

Signature, company stamp: ________________________________________________________

Notes

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________

PUMPS

SYSTEMS

WATER TREATMENT

ENGINEERING

SERVICES

OSNA-Pumpen GmbH Your no. 1 choice for the solution you need:

Brückenstrasse 3

49090 Osnabrück, Germany - Consulting - Training

Phone: [phone] – 0 - Planning - Maintenance

Fax: [phone] – 220 - Project management - Repair

Internet: http://www.osna.de - Assembly

E-mail: [email protected]

OSNA customer service Tel.: [phone] – 254

Emergency service Tel.: [phone] – 674