DP DPHM, DPHMC Installation And Operating Instructions Manual

Horizontal multi-stage centrifugal pumps

Installation and operating instructions

series: DPHM(C)

2

Table of Contents

1: Manual Introduction

1.1 Preface................................................................................................................................................... 3

1.2 Icons and symbols ................................................................................................................................. 3

2: Identification, service and technical support

2.1 Obtaining data and information DPHM(C) 2/4/6 .................................................................................... 4

2.2 Seal codes ............................................................................................................................................. 5

2.3 Current ................................................................................................................................................... 5

2.4 Supplementary documentation .............................................................................................................. 5

3: Warranty

3.1 Terms of warranty .................................................................................................................................. 6

4: Safety and environment

4.1 General .................................................................................................................................................. 7

4.2 Users...................................................................................................................................................... 7

4.3 Safety provisions.................................................................................................................................... 7

4.4 Safety precautions ................................................................................................................................. 7

4.5 Environmental aspects........................................................................................................................... 8

5: Pump Introduction

5.1 Model key............................................................................................................................................... 9

5.2 Description of the product ...................................................................................................................... 9

5.3 Intended use .......................................................................................................................................... 9

5.4 Operation ............................................................................................................................................... 9

5.5 Measuring, draining and venting.......................................................................................................... 10

5.6 Working range...................................................................................................................................... 10

6: Transport

6.1 Transport...............................................................................................................................................11

6.2 Storage..................................................................................................................................................11

7: Installation instructions

7.1 Setting up the pump............................................................................................................................. 12

7.2 Electrical installation ............................................................................................................................ 13

7.3 Commissioning .................................................................................................................................... 13

8: Operation

8.1 Operation ............................................................................................................................................. 15

9: Maintenance

9.1 Introduction .......................................................................................................................................... 16

9.2 Maintaining the pump for an extended period of non-operation .......................................................... 16

10: Failures

10.1 Failure table ......................................................................................................................................... 17

10.2 Torques of vent and draining plugs...................................................................................................... 19

11: Annexes

11.1 EC declaration of conformity................................................................................................................ 20

3

1 Manual Introduction

1.1 Preface

This manual contains important information for
reliable, proper and efficient operation. Compliance
with the operating instructions is of vital importance to
ensure reliability and a long service life of the product
and to avoid any risks.
The first chapters contain information about this
manual and safety in general. The following chapters
provide information about normal use, installation,
maintenance and repairs of the product. The annex
contains the declaration(s) of conformity.

• Make yourself familiar with the content.

• Accurately follow the directions and instructions.

• Never change the sequence of the operations to

be carried out.

• Keep this manual or a copy of it together with the

logbook in a fixed place near the product which
can be accessed by all personnel.

1.2 Icons and symbols

In this manual and in all accompanying
documentation the following icons and symbols are
used.

WARNING
Danger of electric Voltage. Safety sign
according to IEC 417 - 5036

WARNING
Operations or procedures, if carried out
without caution, may cause personal
injury or damage to the product.
General hazard sign according to ISO
7000-0434

ATTENTION
Is used to introduce safety instructions
whose non-observance may lead to
damage to the product and its
functions.

ENVIRONMENTAL INSTRUCTION
Remarks with respect to the
environment.

4

2 Identification, service and technical

support

2.1 Obtaining data and
information DPHM(C) 2/4/6

The name plate indicates the type series / size, main
operating data and identification number. Please
quote this information in all queries, repeat orders
and particularly when ordering spare parts. If you
need any additional information or instructions
exceeding the scope of this manual or in case of
damage, please contact DP-Pumps nearest customer
service centre.

Table 1: Description nameplate

ID3297

Figure 1: Pump with motor

4374

Figure 2: Duty point

3060

H

Indication Meaning
DPHMC 4/6 B Model key (design version B)

1.1 kW Installed motor power

50 Hz Nominal frequency

ID 290048451060M Pump ID

Q 4.3 m

3

/h Optimum capacity running at n

fix

(see fig. 2: Duty point)

H 40.4 m Optimum head running at n

fix

(see fig. 2: Duty point)

PO Purchase order number

Prod. 07/2014 1103153-4682 Production week/year and production serial number > as built file

Seal. Ca/Ce/EPDM Mechanical Seal Surface Code and elastomer, see fig. 2.2: Seal codes

n fix. 2880 rpm Rotation speed indication at which Q/H are given

T -10/+60°C Temperature range

p PN10 Pressure Class connection

5

2.2 Seal codes

Table 2: Material code shaft seal

2.3 Current

2.3.1 Nominal current

The nominal allowable current of the motor is stated
on the motor plate. This shows the nominal working
range of the motor and can be used to protect the
motor.

Measuring the actual current of the pump during
operation can be used to pre-set the motor protection
switch to protect the pump/motor combination.
This current value can also be used to determine the
proper electrical equipment such as variable
frequency drive, main switch, wiring diameter etc.

WARNING
Not only the motor, but also the pump
has to be protected in its application.

2.3.2 Motor protection

Standard single phase motors are delivered including
motor protection. The motor protection is provided
either by a thermal circuit breaker or by a motor
winding protection.

Please contact your supplier for more detailed
information about your motor protection.

2.4 Supplementary
documentation

Apart from this manual, the documentation given
below is also available:

Table 3: Supplementary documentation

Code acc. to EN 12756 Description Material Note

B Spring loaded ring Carbon graphite Ca Resin impregnated

V Seat ring Ceramic Ce Aluminium oxide

E
P

Elastomers EPDM

NBR

EPDM
NBR

Ethylene propylene rubber
Nitrile butadiene rubber

F Spring CrNi steel

F Other metal parts CrNi steel

Protection device

variant

Type of protection

Suitable for ambient

temperature [°C]

Located in

Reset

1 Thermal

circuit breaker

20 - 30 Thermal

box

Manual

2 Winding

protection

-20 - 50 Motor
winding

Automatic

Document Code

General terms of delivery 119 / 1998

DPHM(C) 2/4/6

Technical Data 50/60 Hz Version B 97004494

See also www.dp-pumps.com

6

3 Warranty

3.1 Terms of warranty

The warranty period is settled by the terms of your
contract or at least by the general terms and
conditions of sales.

ATTENTION
Modifications or alterations of the
product supplied are only permitted
after consultation with the
manufacturer. Original spare parts and
accessories authorized by the
manufacturer ensure safety. The use of
other parts can invalidate any liability of
the manufacturer for consequential
damage.

ATTENTION
The warranty relating to the operating
reliability and safety of the product
supplied is only valid if the product is
used in accordance with its designated
use as described in the following
sections of this manual. The limits
stated in the data sheet must not be
exceeded under any circumstances.

The warranty becomes invalid if one or more of the
points below occur.

• The buyer makes modifications himself.

• The buyer carries out repairs himself or has

these carried out by a third party.

• The product has been handled or maintained

improperly.

• The product has non original DP-Pumps spare

parts fitted.

DP-Pumps repairs defects under warranty when:

• They are caused by flaws in the design, the

material or the production.

• They are reported within the warranty period.

Other terms of warranty have been included in the
general terms of delivery, which are available upon
request.

7

4 Safety and environment

4.1 General

This DP-Pumps product has been developed using
state-of-the-art technology; it is manufactured with
utmost care and subject to continuous quality control.
DP-Pumps does not accept any liability for damage
and injury caused by not observing the directions and
instructions in this manual, or in cases of
carelessness during the installation procedure, use
and maintenance of the product.
Non-compliance with safety instructions can
jeopardize the safety of personnel, the environment
and the product itself. Non-compliance with these
safety instructions will also lead to forfeiture of any
and all rights to claims for damages.
For example, in particular non-compliance can result
in:

• failure of important pump/system functions,

• failure of prescribed maintenance and servicing

practices,

• injury to persons by electrical, mechanical and

chemical effects,

• hazard of the environment due to leakage of

hazardous substances,

• explosions.

Depending on specific activities, extra safety
measures may be required. Contact DP-Pumps if a
potential danger arises during use.

ATTENTION
The owner of the product is responsible
for compliance with the local safety
regulations and internal company
guidelines.

ATTENTION
Not only must the general safety
instructions laid down in this chapter
on "Safety" be complied with, but also
the safety instructions outlined under
specific headings.

4.2 Users

All personnel involved in the operation, maintenance,
inspection and installation of the product must be fully
qualified to carry out the work involved and be aware

of all applicable responsibilities, authorisations and
super visions. If the personnel in question is not
already in possession of the required know-how,
appropriate training and instruction must be provided.
If required, the operator may commission the
manufacturer / supplier to take care of such training.
In addition, the operator is responsible for ensuring
that the contents of the operating instructions are fully
understood by the responsible personnel.

4.3 Safety provisions

The product has been designed with the greatest
possible care. Original parts and accessories meet
the safety regulations. Modifications in the
construction or the use of non-original parts may lead
to a safety risk.

ATTENTION
Make sure that the product operates
within its working range. Only then the
product performance is guaranteed.

4.3.1 Labels on the product

The icons, warnings and instructions applied to the
product are part of the safety provisions. The labels
may not be removed or covered. Labels must remain
legible during the entire life of the product. Replace
damaged labels immediately.

4.4 Safety precautions

4.4.1 During normal use

• Contact the local electricity company for

questions about the power supply.

• Protect the parts that can become hot, making

direct contact impossible.

• When applicable, always place undeformed

coupling guards to protect the coupling, before
putting the pump into use. Make sure that the
coupling guards are never in contact with the
rotating coupling.

• Always close the terminal box of the motor.

• Always close the control panel where applicable

8

4.4.2 During installation, maintenance and
repair

Only authorised personnel may install, maintain and
inspect the product and repair electrical components.
Observe the local safety regulations.

WARNING
Always disconnect the energy supply to
the product first, before installation,
maintenance and repairs. Secure this
disconnection.

WARNING
Surfaces of a pump can be hot after
continuous operation.

WARNING
Make sure that no one can be near
rotating components when starting a
pump.

WARNING
Handle a pump with dangerous liquids
with the utmost care. Avoid danger for
persons or the environment when
repairing leakages, draining liquids and
venting. It is strongly recommended to
place a leakage tray under the pump.

WARNING
Immediately following completion of
the work, all safety-relevant and
protective devices must be re-installed
and / or re-activated.

WARNING
Please observe all instructions se t out
in the chapter "Commissioning/Start­up" before returning the product to
service.

4.5 Environmental aspect s

4.5.1 General

The products of DP-Pumps are designed to function
in an environmentally friendly way during their entire
lifetime. Therefore, when applicable, always use
biodegradable lubricants for maintenance.

ENVIRONMENTAL INSTRUCTION
Always act according to the laws, by­laws regulations and instructions with
respect to health, safety and the
environment.

4.5.2 Dismantling

The owner is responsible for the dismantling and
environmentally friendly disposal of the product.

ENVIRONMENTAL INSTRUCTION
Ask at the local government about the
re-use or the environmentally friendly
processing of discarded materials.

9

5 Pump Introduction

5.1 Model key

Table 4: Model key Example

5.2 Description of the product

The horizontal multi-stage centrifugal pump is
designed for pumping clean, or slightly aggressive,
watery mediums. The pump is easy to install,
commission and operate.
The hydraulic assembly is driven by an electric motor.
All hydraulic parts of the pump are made of stainless
steel. Pump casings are available in stainless steel or
cast-iron.

5.3 Intended use

The pumps DPHM are suitable to transport and
increase the pressure of cold and hot water without
wear to parts within the indicated working range. The
transport of liquids with a different viscosity or density
than water is possible as well. For this a motor with an
adjusted power could be required. Ask DP-Pumps or
your distributor for advice.

Any other or further use of the pump is not in
conformity with its intended use. DP-Pumps does not
accept any liability for any damage or injury that
results from this. The pump is produced in
accordance with the current standards and
guidelines. Use the pump only in a perfect technical
state, in conformance with the intended use
described below.

The Intended use as laid down in ISO 12100:2010 is

the use for which the technical product is intended
according to the specifications of the manufacturer.
The use of the product has been described in the
sales brochure and in the user manual. Always

observe the instructions given in the user manual.
When in doubt the product must be used as becomes
evident from its construction, version and function.

5.4 Operation

The rotating impeller causes the pressure at the inlet
of the impeller to drop. This decrease in pressure
creates the flow through the suction connection (A).
Every stage (B) consists of an impeller and a diffusor.
The capacity of the pump is determined by the size of
the passageway of the stage. The pressure of the
stage is determined by the diameter of the impeller.
Because of the modular type of construction it is
possible to choose the number of impellers most
suited to the required duty point. After leaving the last
impeller the medium flows between the pump stages
and the outer sleeve (C) and exits the pump at the
discharge connection (D)

DP H M C 2 /2 B

Label DP Product Label

Material/
Construction

H Horizontal

M All hydraulic parts Stainless Steel 1.4301 / AISI 304 with close coupled motor

C Cast Iron pump casing

Connections DIN connection size: suction G 5/4 - discharge G 1

2 Size (Capacity in m

3

/h at Q

opt

)

/2 Number of stages

B Design version B

ID4376

Figure 3: DPHM(C) 2/4/6

20131394

A

D

E

F

B

C

10

5.5 Measuring, draining and
venting

The pump is provided with plugs for measuring,
draining and venting.
Connection (E) is meant to fill and vent the pump, or
to measure the inlet / suction pressure using a G ¼
connection.
Connection (F) is meant to drain the pump, or to
measure the discharge pressure using a G ¼
connection.

5.6 Working range

Table 5: General working range specification

ATTENTION
The temperature difference between the
medium and the pump should never
exceed 60 °C. The pump must be filled /
heated-up slowly in any case where the
difference between pump and medium
is more then 30 °C to avoid any chance
of a thermal shock.

For minimum/maximum flow at medium temperature
of 20

o

C see table 6: Minimum/maximum capacity
(Qmin/max); for higher temperatures see figure 4:
Minimum capacity vs. temperature (in % of Q
optimum)

Table 6: Minimum/maximum capacity (Q

min/max

)

Pump type DPHM note

Ambient temperature [°C] -20 up to 30 (50)

1,2,3

1. Avoid freezing the pump.

2. If the ambient temperature exceeds the above value or

the motor is located more than 1000 m above sea

level, the motor cooling is less effective and could

require an adapted motor power. Please contact your

supplier for more detailed advice.

3. Single phase motors are equipped either with a ther-

mal circuit breaker or motor winding protection (see

2.3.2 Motor protection). Please contact your supplier

for more detailed information about your motor protec-

tion.

Medium temperature [°C] -10 up to 60

Minimum inlet pressure NPSH

req.

+ 1 m

Viscosity [cSt] 1-100

4

4. Deviation in viscosity and/or density could require an

adapted motor power. Please contact your supplier for

more detailed advice.

Density [kg/m

3

] 1000-2500

2

Cooling forced motor cooling

Minimum frequency [Hz] 30

Maximum frequency [Hz] 60

5

5. Pumps that are intended for 50 Hz operation, may not

be connected to 60 Hz power supply.

Maximum number of starts see motor data sheet

6

6. Frequent start/stops, in particular in combination with

higher pressure differences (Δp) may result in a short-

ened product lifetime. Consult your supplier for such

applications.

Noise emission see motor data sheet

7

7. Only the noise emission of the motor is documented.

Allowable size of solids
pumped

5 µm to 1 mm

size Q

min/max

[m3/h]
2 pole
50 Hz 60 Hz
Min. Max. Min. Max.

2 0.2 3.3 0.2 4.0

4 0.4 6.5 0.5 7.8

6 0.6 9.0 0.8 10.8

4431

Figure 4: Minimum capacity vs. temperature
(in % of Q optimum)

4431

9

9,5

10

10,5

11

40 45 50 55 60

Q%

T[°C]

11

6 Transport

6.1 Transport

Always observe the directions as indicated on the
installation by means of stickers.

1. Transport the installation in the position as
indicated on the pallet or packaging.

2. Make sure that the installation is stable.

3. Observe the instructions on the packaging (if
present).

6.2 Storage

Fill the pump with glycol in order to protect it against
the risk of frost.

Table 7: Storage

6.2.1 Inspection during storage

1. Turn the shaft every three months and just
before putting into operation.

Storage

t

ambient

[°C] -10/+40

Max. rel. humidity 80% at 20 °C not condensing

12

7 Installation instructions

7.1 Setting up the pump

ATTENTION
Avoid stress in the pump casing caused
by misalignment in the piping system.
Please see table below.

ATTENTION
Pumps which do not stand steady or
stable on their own, shou ld be mounted
on a rigid and stable base.

ATTENTION
Locate the pump at the place with the
lowest risk for noise nuisance.

1. Place and install the pump on a level, stable
surface in a dry and frost-proof room.

2. Place the pump as close to the source/tank as
possible.

3. Make sure that sufficient air can reach the
cooling fan of the motor. For this purpose the
free space above the cooling fan should be at
least 1/4 of the diameter of the fan hood air
intake.

4. It is advised to install a shut off valve on the
supply and on the delivery connection of the
pump.

5. To avoid medium flowing back through the
pump, when idle, make sure a non-return valve
is installed.

6. To the suction line should apply:

1. 100% airtight.

2. No camber.

3. Running from the lowest point in the tank
straight to the pump.

4. Provided with a foot valve that shuts off
well, making sure that the suction line is
always filled with water.

5. If the diameter of the suction line is larger
than the pump-suction connection, then
install an eccentric adapter in order to
prevent air pockets and swirling.

7.1.1 Indicators

The arrow (A) on the fan hood indicates the rotating
direction of the motor in case of a 3 phase motor.

7.1.2 Install bypass

Install a bypass if the pump may operate against a
closed valve for a long period. The required capacity
of the bypass is at least 10% of the maximum volume
flow. At high operating temperatures a higher volume
flow is required. With temperatures above 60ºC the
required capacity is more than 10%.

ATTENTION
Do not make use of quick-closing
valves and/or shut-off valves to prevent
pressure impulses in the pump and in
the lines as a result of changes in the
flow rate

Figure 5: DPHM(C) not connected

20131398

ID4377

Figure 6: Terminal box and fan hood sticker

20131395

A

13

7.2 Electrical installation

WARNING
In accordance with the local regulations
only authorised personnel is allowed to
make electrical connections to the
motor.

ATTENTION
Connect the motor according to figure
7: Motor connections and always check
the rotation direction.

Electrical connections:

• Make sure that the motor specifications

correspond with the power supply to which the
pump motor is connected. Consult "Electrical
diagrams" for the correct connection diagram.

• Connect the motor using a motor safety switch.

7.3 Commissioning

WARNING
The pump must be switched off when it
is not completely filled up.

ATTENTION
Check the direction of rotation
according to fig. 6: Terminal box and
fan hood sticker. In case of a 3-phase
motor the rotation direction can be
changed by exchanging two of the 3
phases.

Example may differ upon chosen motor

ID2482

Figure 7: Motor connections

20140034

14

7.3.1 Prime the pump

• Close the discharge shut-off valve (B);

• Close the suction shut-off valve (A);

• Unscrew the fill plug (C);

• Gradually open the suction shut-off valve (A)

until the liquid flows from the fill plug (C);

• Close the fill plug (C);

• Open shut-off valve (B);

• Vent the pump on discharge side for example

via a venting valve (D) on discharge side (see
Figure 8: Example: installation of a pump under
pressure operation);

• Close the venting option on discharge side;

• Close the discharge shut-off valve (B);

• repeat these steps until all air is removed from

the pump;

• Make sure that the suction shut-off valve is

entirely open.

• Open the discharge shut-off valve (B);

• Remove the fill plug (C);

• Put a funnel into the port (C) and completely fill

the pump with the liquid to be pumped;

• Vent the pump on discharge side for

example via a venting valve (D) on
discharge side (see Figure 9: Example:
installation of a pump in suction-operation);

• Make sure all air is removed from the

pump;

• Close the venting option on discharge side;

• Close the discharge shut-off valve (B);

• Close the fill plug (C).

7.3.2 Start the pump

• Start the motor;

• Gradually open the discharge shut-off valve (B);

• Make sure the pump started correctly within 20

seconds, if not then:

• Switch off the motor;

• Re-prime the pump;

• Start the motor again;

• Switch the pump off and on for 2-3 times, after

running continues for 30 seconds and make sure
all air is removed from the pump.

7.3.3 After an extended period of non­operation or storage

During first start-up, check the mechanical seals for
leakage due to seizure or dehydration of the
lubricating film. If so, please proceed as following:

1 Turn shaft manually;
2 Check if the mechanical seal is still leaking.

If the mechanical seal is still leaking:

1 Disassemble the mechanical seal;
2 Thoroughly clean and degrease the running

surfaces;

3 Assemble the mechanical seal again and retry

start-up.

If this doesn’t solve the shaft leakage, replacement of
the mechanical seal is necessary.

Figure 8: Example: installation of a pump
under pressure operation

20131396-A

Figure 9: Example: installation of a pump
in suction-operation

20131397-A

A

B

C

D

CB D

15

8 Operation

8.1 Operation

The pump is controlled externally and therefore does
not need any operation guidance.

16

9 Maintenance

9.1 Introduction

WARNING
Observe the general safety precautions
for installation, ma inte nance and repair .

Regular maintenance is necessary for the correct
operation of a pump. Please contact your supplier for
maintenance of the pump.

9.2 Maintaining the pump for an
extended period of non­operation

Turn the shaft every three months1. This protects the
seals from seizure.

Protect the pump if there is a risk of frost. Proceed as
follows:

1. Close all pump valves.

2. Drain each pump and/or the system.

3. Remove all plugs from the pump.

4. Open the shut-off and fill/air vent plug, if present.

1. period may vary per application or medium. Please

consult your sales representative for application

details.

17

10 Failures

10.1 Failure table

WARNING
Observe the general safety precautions
before installation, maintenance and
repair.

Problem Possible cause Possible solution Checkpoints

Leakage along the shaft. Running surfaces of the

mechanical seal worn or
damaged.

Replace the mechanical
seal.

Check the pump for dirt /
abrasive parts.

New pump: seal stuck due
to assembly.

Open and close the outlet
shut-off valve quickly dur-

ing operation.
Mechanical seal mounted
incorrectly.

Install the mechanical seal

correctly. Use water and

soap as a lubricant.
Elastomers affected by
medium.

Use the right rubber com-

pound for the mechanical

seal.
Pressure too high. Use the right type of

mechanical seal.
Shaft worn. Replace shaft and

mechanical seal.
Pump has been operating
without water.

Replace the mechanical

seal.

Leakage along the shroud
at the top bracket or at the
pump casing.

O-ring worn Replace the O-ring.
O-ring not resistant to the
medium to be pumped

Replace O-ring by an O-

ring with better resistance
Too much stress on the
pump casing; it becomes
oval.

Decrease stress on piping.

Mount the pump casing

without stress.

Support the connections.

Pump is vibrating or noisy. Coupling mounted incor-

rectly.

Install the coupling in par-

allel.
Faulty setting of the
hydraulic assembly.

Adjust the assembly

according to the manual.
There is no water in the
pump.

Fill and vent the pump.

No supply of medium. Make sure there is suffi-

cient supply. Check for

blockages in the supply

line.
Bearings of pump and/or
motor worn.

Have the bearings

replaced by a certified

company.
Available NPSH too low
(cavitation).

Improve suction condition.

18

Pump is vibrating or noisy. Pump does not work in its

working range.

Select another pump or

adjust the system to work

within its working range.
Pump is standing on an
uneven surface.

Level the surface.

Malfunction. Internal blockage in the

pump.

Have the pump inspected

by a certified company.

Pump does not start. No voltage on the power

terminal.

Check the power supply.

• Circuit

• Main switch

• Fuses

Check the motor safety

relay

• Earth leakage switch

• Protective relay

Thermal motor safety
switch triggered.

Reset the thermal motor-

safety. Contact the sup-

plier, if this problem occurs

more often.

Check if the correct value
is set. Find the correct
value (I

nom

) on the motor

type plate.
The motor is running, but
the pump does not work.

The coupling between
pump- and motor shaft is
loose (when applicable).

Tighten the connecting
screws to the required
torque.

The pump shaft is broken. Contact the supplier.
Pump supplies insufficient
capacity and/or pressure.

Outlet and/or inlet shut-off

valve is closed.

Open both shut-off valves.

There is air in the pump. Vent the pump.

The suction pressure is

insufficient.

Increase the suction pres-

sure.
Pump rotates in the wrong
direction.

Change over L1 and L2 of

the three phase supply.
The suction line has not
been vented.

Vent the suction line.

Air bubble in the suction
line.

Install the suction line with

pump end higher than the

other end.
Pump sucks air because
of leakage in the suction
line.

Repair the leakage.

Water flow too low. So air
bubbles clog up in the
pump.

Make sure the flow

increases or use a smaller

pump.
The diameter of the suc­tion line is too small.

Increase the diameter of

the suction line.
Capacity of water meter in
the supply line is too
small.

Increase the capacity of

the water meter.

Foot valve blocked. Clean the foot valve.
The impeller, the diffuser
or stage is blocked.

Clean the inside of the

pump.
O-ring between impeller
and diffuser is gone.

Replace the O-rings.

O-ring not resistant to the
medium to be pumped.

Replace O-ring by an O-

ring with better resistance.

Problem Possible cause Possible solution Checkpoints

19

10.2 Torques of vent and draining
plugs

Table 8: Torques

Material

Dimensions

Torques

[Nm]

Figure

PEHD G 1/4 3 Locations E and F in

fig. 3: DPHM(C) 2/4/6

20

11 Annexes

11.1 EC declaration of conformity

DP-Pumps
Kalkovenweg 13
2401 LJ Alphen aan den Rijn, The Netherlands
Tel: [phone]

Hereby declares as manufacturer entirely on his own responsibility, that the products:

Horizontal multi-stage centrifugal pumps, series: DPHM(C)

The pump is subject to this declaration of conformity as a stand alone product. Make sure the appliance or
installation in which the pump is built in, has got a declaration of compliance with the directives listed above, for its
complete assembly.

Alphen aan den Rijn
01/03/2014

Authorized representative
W. Ouwehand, technical director.

Serial number: 18/2012 1000000-0001 [...] 52/2016 9999999-9999

to which this declaration refers, is in accordance with the following standard: EN 809: 1998+A1:2009/AC:2010
according to the provisions of the harmonized standard for pumps and which implies the regulations of Machine
directive 2006/42/EC, EMC directive 2004/108/EC, in the most recent form

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dp pumps

dp pumps

P.O. Box 28
2400 AA Alphen aan den Rijn
The Netherlands

t [phone]
f [phone]

[e-mail]
www.dp-pumps.com

11/2014

BE00000554-B
Can be changed without prior notice
Original instructions