Wright flow Classic+, CP10/0005/12, CP20/0020/12, CP30/0069/12, CP40/0180/12 Installation, Operation And Maintenance Manual

I

NSTALLATION,

O

PERATION

A

ND

M

AINTENANCE

M

ANUAL

F

OR THE

Range of Pumps

Page 2

Installation, Operation & Maintenance Manual

For The Classic+ Range Of Rotary Lobe Pumps

1.0

Safety Information. 5

1.1

Risk assessment relating to the use of Wright Flow Technologies Limited.
Classic+ rotary lobe pumps and pump units in potentially explosive
atmospheres. 8

2.0

Introduction. 9

2.1

General. 9

2.2

Wright Flow Technologies Limited Distributors. 9

2.3

Receipts and Storage. 9

2.4

Cleaning. 10

2.5

Pump Model Designation. 10

2.5.1 ATEX Information 11

2.5.2 Equipment Groups & Categories 11

2.6

Pump Model and Serial Number. 12

3.0

General. 14

3.1

Classic+ Pumping Principal. 14

3.2

Classic+ Range Operating Parameters. 15

3.3

System Design. 17

3.3.1 System Design and Installation. 17

3.3.2 Installations with CIP Systems. 19

3.4

Start Up Procedure. 20

3.5

Shutdown Procedure. 21

3.6

Routine Maintenance. 22

3.7

Heating and Cooling Jackets 22

3.8

Integral Pressure Relief Valves 25

3.8.1 Setting and Operating Spring Loaded Valves 26

3.8.2 Setting and Operating Air Loaded Integral Pressure Relief Valves 27

4.0

Classic+ Disassembly and Assembly. 30

4.1

CP10, CP20 and CP30 Pump - Disassembly and Assembly. 32

4.1.1 CP10, CP20 and CP30 Front Cover and Rotor Removal 32

4.1.2 CP10, CP20 and CP30 Rotorcase Removal 35

4.1.2.1 CP10, CP20 and CP30 Rotorcase Removal for Pumps fitted with Single Un­Flushed Mechanical Seals and Single O-Ring Seals 35

4.1.2.2 CP10, CP20 and CP30 Rotorcase Removal for Pumps Fitted with Single
Flushed or Double Flushed Mechanical Seals. 37

4.1.3 CP10, CP20 and CP30 Gearbox Disassembly 38

4.1.3 CP10, CP20 and CP30 Gearbox Assembly 42

4.1.4 CP10, CP20 and CP30 Rotorcase, Rotor and Front Cover Assembly 46

4.2

CP40 Pumps - Disassembly and Assembly 48

Page 3

4.2.1

CP40 Front Cover and Rotor Removal 48

4.2.2 CP40 Rotorcase Removal 50

4.2.2.1 CP40 Rotorcase Removal for Pumps fitted with Single Un-flushed
Mechanical Seals and O-Ring Seals 50

4.2.2.2 CP40 Rotorcase Removal for Pumps Fitted with Single Flushed or Double
Flushed Mechanical Seals. 52

4.2.4 CP40 Gearbox Assembly 55

4.2.5 CP40 Rotorcase, Rotor and Front Cover Assembly 58

4.3

CP50 Pumps - Disassembly and Assembly 59

4.3.1 CP50 Front Cover and Rotor Removal 59

4.3.2 CP50 Rotorcase Removal 61

4.3.2.1 CP50 Rotorcase Removal for Pumps fitted with Single Un-flushed
Mechanical Seals and O-Ring Seals 61

4.3.2.2 CP50 Rotorcase Removal for Pumps fitted with Single Flushed and Double
Flushed Mechanical Seals 63

4.3.3 CP50 Gearbox Disassembly 64

4.3.4 CP50 Gearbox Assembly 66

4.3.5 CP50 Rotorcase, Rotor and Front Cover Assembly 69

5.0

Classic+ Mechanical Seal Removal & Replacement. 71

5.1

General Procedures for Installing Mechanical Seals. 71

5.2

CP10, CP20, CP30 and CP40 Mechanical Seals 72

5.2.1 CP10, CP20, CP30 and CP40 Single Mechanical Seal Removal 72

5.2.2 CP10, CP20, CP30 and CP40 Single Mechanical Seal Replacement 73

5.2.3 CP10, CP20, CP30 and CP40 Single Flushed Mechanical Seal Removal 74

5.2.4 CP10, CP20, CP30 and CP40 Single Flushed Mechanical Seal Replacement 75

5.2.5 CP10 Double Flushed Mechanical Seal Removal 76

5.2.6 CP10 Double Flushed Mechanical Seal Replacement 77

5.2.7 CP20, CP30 and CP40 Double Flushed Mechanical Seal Removal 78

5.2.8 CP20, CP30 and CP40 Double Flushed Mechanical Seal Replacement 79

5.3

CP50 Mechanical Seals 80

5.3.1 CP50 Single Mechanical Seal Removal 80

5.3.2 CP50 Single Mechanical Seal Replacement 80

5.3.3 CP50 Single Flushed Mechanical Seal Removal 81

5.3.4 CP50 Single Flushed Mechanical Seal Replacement 81

5.3.5 CP50 Double Flushed Mechanical Seal Removal 82

5.3.6 CP50 Double Flushed Mechanical Seal Replacement 83

6.0

Classic+ Single O-Ring Seals 84

6.1

General Procedures for Fitting Single O-Ring Seals 84

6.2

Oring Seals for CP10, CP20, CP30 and CP40 Pumps 85

6.2.1 CP10, CP20, CP30 and CP40 Oring Seal Assembly and Removal 85

6.3

O-Ring Seal for CP50 Pump 86

6.3.1 CP50 O-Ring Seal Assembly and Removal 86

Page 4

6.4

Classic+ Packed Gland Seals 87

6.4.1 General Procedures For Fitting Packed Gland Seals 87

6.5

Packed Gland Seals - CP10, CP20, CP30 and CP40 Series Pumps 88

6.5.1 Packed Gland Seal Removal 88

6.5.2 Packed Gland Seal Replacement 89

6.5.3 Flushed Packed Gland Seal Removal 89

6.5.4 Flushed Packed Gland Seal Replacement 90

6.6

Packed Gland Seals - CP50 Series Pumps. 91

6.6.1 Packed Gland Seal Removal 91

6.6.2 Packed Gland Seal Replacement 91

6.6.3 Flushed Packed Gland Seal Removal 92

6.6.4 Flushed Packed Gland Seal Replacement 93

6.6.5 Seal Conversion to Packed Gland (With Shaft Sleeve) 93

6.6.6 Seal Conversion to Flushed Packed Gland (With Shaft Sleeve) 94

7.0

Flushed Product Seals Auxiliary Services 95

7.1

Single Mechanical Seal (for Low-Pressure Quench or Flush) 95

7.2

Double Mechanical Seal (for High Pressure Flush) 96

7.3

Flushed Packed Gland Seal 96

8.0

Specifications 97

8.1

Clearance Chart 97

8.2

Fasteners & Torque Settings. 99

8.3

Lubricants. 100

8.4

Material Specifications. 100

8.5

Foundation Dimensions and Weights. 101

8.6

Rectangular Inlet 103

8.7

Trouble Shooting. 104

8.8

Typical Noise Emission Data - CP10, CP20 and CP30 Pumps. 105

8.9

Typical Noise Emission Data – CP40 and CP50 Pumps. 106

8.10 Service History. 107

8.11 Tool List. 108

9.0

Notes. 110

Page 5

1.0 Safety Information.

INCORRECT INSTALLATION, OPERATION, OR MAINTENANCE OF

EQUIPMENT MAY CAUSE SEVERE PERSONAL INJURY OR DEATH

AND/OR EQUIPMENT DAMAGE AND MAY INVALIDATE THE WARRANTY.

THIS INFORMATION MUST BE READ FULLY BEFORE BEGINNING

INSTALLATION, OPERATION, OR MAINTENANCE AND MUST BE KEPT

WITH THE PUMP. SUITABLY TRAINED OR QUALIFIED PERSONS MUST

UNDERTAKE ALL INSTALLATION AND MAINTENANCE ONLY.

DANGER

DO NOT OPERATE PUMP IF:

- The front cover is not installed correctly.

- Any guards are missing or incorrectly installed.

- The suction or discharge piping is not connected.
DO NOT place fingers, etc. into the pumping chamber or its connection ports

or into any part of the gearbox if there is ANY possibility of the pump shafts
being rotated. Severe injury will occur.

DO NOT exceed the pumps rated pressure, speed, and temperature, or
change the system/duty parameters from those for which the pump was
originally supplied, without confirming its suitability for the new duty. Running
of the pump outside of its operation envelope can cause mechanical contact,
excessive heat and can represent a serious risk to health and safety.

Installation and operation of the pump must always comply with health and
safety regulations.

A device must be incorporated into the pump, system, or drive to prevent the
pump exceeding its stated duty pressure. It must be suitable for both
directions of pump rotation where applicable. Do not allow pump to operate
with a closed/blocked discharge unless a pressure relief device is
incorporated. If an integral relief valve is incorporated into the pump, do not
allow re-circulation through the relief valve for extended periods (refer to
section 3.8).

Warning - Safety instructions which

shall be considered for reasons of safe

operation of the pump or pump unit

and/or protection of the pump or pump

unit itself are marked by the sign:

Danger - Failure to follow the listed
precautionary measures may result

in serious injury or death are

identified by the following symbol:

WARNING

Page 6

The mounting of the pump or pump unit should be solid and stable.

Pump orientation must be considered in relation to drainage/cavity
ventilation requirements. Once mounted, shaft drive elements must be
checked for correct alignment. Rotate pump shaft by at least one full
revolution to ensure smoothness of operation. Incorrect alignment will
produce excessive loading and will create high temperatures and
increased noise emissions. It may also be necessary to earth the pump
head to avoid the build up of a potential charge difference that could
cause a spark.

The installation must allow safe routine maintenance and inspection (to
replenish lubricants, check for leakage, monitor pressures, etc) and provide
adequate ventilation necessary to prevent overheating.

Fill all gearboxes with the recommended grades and quantities of lubricant
(refer to section 3.4 and 8.3). Beware of over/under filling the gearbox as this
could cause the pump to overheat and mechanical damage to occur.

Before operating the pump, be sure that it and all parts of the system to which
it is connected are clean and free from debris and that all valves in the suction
and discharge pipelines are fully opened. Ensure that all piping connecting to
the pump is fully supported and correctly aligned with its relevant connections.
Misalignment and/or excess loads will cause severe pump damage. This
could result in unexpected mechanical contact in the pump head and has the
potential to be an ignition source.

Be sure that pump rotation is correct for the desired direction of flow (refer to
section 3.4).

Do not install the pump into a system where it will run dry (i.e. without a supply
of pumped media) unless it is equipped with a flushed shaft seal arrangement
complete with a fully operational flushing system. Mechanical seals require a
thin fluid film to lubricate the seal faces. Dry running can cause excessive heat
and seal failure.

Pressure gauges/sensors are recommended, next to the pump suction and
discharge connections to monitor pressures.

Caution must be taken when lifting the pump. Suitable lifting devices should
be used as appropriate. Lifting eyes installed on the pump must only be used
to lift the pump, not pump with drive and/or base plate. If pump is base plate
mounted, the base plate must be used for all lifting purposes. If slings are
used for lifting, they must be safely and securely attached. For weights of bare
shaft pumps refer to section 8.5.

WARNING

WARNING

WARNING

WARNING

WARNING

Page 7

DO NOT attempt any maintenance or disassembly of the pump or pump unit
without first ensuring that:

- The pump is fully isolated from the power source (electric, hydraulic,
pneumatic).

- The pumping chamber, pneumatic relief valve and any shaft seal
support system are depressurised and purged.

- Any temperature control devices (jackets, heat-tracing, etc) are fully
isolated, that they are depressurised and purged, and components are
allowed to reach a safe handling temperature.

DO NOT attempt to dismantle a pressure relief valve, which has not

had the spring pressure relieved, is still connected to a pressurised
gas/air supply or is mounted on a pump that is operating. Serious
personal injury or death and/or pump damage may occur.

DO NOT loosen or undo the front cover, any connections to the pump, shaft
seal housings, temperature control devices, or other components, until sure
that such action will not allow the unsafe escape of any pressurised media.

Pumps and/or drives can produce sound power levels exceeding 85-dB (A)
under certain operating conditions. When necessary, personal protection
against noise must be taken. Typical noise emission data can be found in
section 8.8 and 8.9.

Avoid any contact with hot parts of pumps and/or drives that may cause injury.
Certain operating conditions, temperature control devices (jackets, heat­tracing, etc.), bad installation, or poor maintenance can all promote high
temperatures on pumps and/or drives.

When cleaning, either manually or by CIP method, the operator must ensure
that a suitable procedure is used in accordance with the system requirements.
During a CIP cleaning cycle, a pump differential pressure of between 2 and 3
bar (30 and 45 psi) is recommended to ensure suitable velocities are reached
within the pump head. The exterior of the pump should be cleaned
periodically.

Surface temperature of pump is also dependent on the temperature of
pumped medium.

WARNING

Page 8

1.1 Risk assessment relating to the use of Wright Flow Technologies Limited.
Classic+ rotary lobe pumps and pump units in potentially explosive
atmospheres.

Source Of Hazards Potential Hazards

Frequency Of

Hazards

Recommended Measures

Unvented cavities Build up of explosive gas

Very Rare

Ensure that pump is totally filled.

Consider mounting ports vertically.

See Chapter 1.0

Rotorcase / Rotors / Front

Cover

Unintended mechanical

contact

Rare

Ensure that operating pressures are

not exceeded. Ensure that suffcient

NPSH to prevent cavitation.

See

Chapter 1.0/3.3.1

Service plan.

Pump external surfaces

excess temperature.

Electrostatic charging

Rare

User must ensure temperature limits.

Do not overfill gearboxes with

lubricant. Provide a ground contact

for pump.

See Chapter 1.0 /

Service

plan.

Cover 'O' ring

Pump liquid leakage. Build

up of explosive gas.

Very Rare

Check selection of elastomers are

suitable for application. Ensure cover

retaining nuts are tight. Service plan.

Pump casing / cover

Pump liquid leakage. Build

up of explosive gas.

Very Rare

Stainless steel, Corrosion resistant.

Shaft seals

excess temperature.

Unintended mechanical

contact.

Leakage.

Build up of explosive gas.

Rare

Selection of seal system must be

suitable for application.

See Chapter

5.0

. Service plan. Seals must never

run dry.

Auxiliary system for shaft

sealing

Pump liquid leakage. Build

up of explosive gas.

Rare

Selection of auxiliary seal system

must be suitable for application.

Seals must never run dry.

Rotation direction test Excess temperature

Very Rare

If flushed seals are installed ensure

that flush is applied to seal

assemblys. Only allow pump to run

for minimum period - just a few

seconds.

Closed valve condition

Excess Temperature.

Excess Pressure.

Mechanical contact.

Rare

Can cause excessive pressue, heat

and mechanical contact.

See

Chapter 1.0

Shaft Random induced current

Very Rare

Provide a ground contact for pump.

See Chapter 1.0.

Mechanical shaft coupling

(Torque Protection)

Temperature from friction

Sparks from break up of

shear pins.

Electrostatic charging

Rare

Coupling selection must suit

application.

See Chapter 1.0.

Mechanical shaft coupling

(standard)

Break up of spider.

Unintended mechanical

contact.

Electrostatic charging

Rare

Coupling selection must suit

application. Service plan.

See

Chapter 1.0.

Note:- For a feature to be suitable for an application, The feature must be fit for its

designated purpose and also suitable for the environment where it is to be installed.

Page 9

2.0 Introduction.

2.1 General.

Classic+ rotary lobe pumps are manufactured by Wright Flow Technologies
Limited, a unit of the IDEX Corporation.

This manual includes all the necessary information for the Classic+ and
should be read prior to beginning installation, operation, or
maintenance.

Should you require any additional information regarding the Classic+
contact Wright Flow Technologies Limited or their local authorised
distributor, refer to section 2.2.

When asking for assistance please provide the pump model and serial
number. This information can be obtained from the pump nameplate
which is located on the side of the pump gearbox cover, refer to section

2.6.
Should the nameplate be unreadable or missing, the serial number is also

stamped on either side of the rotorcase refer to section 2.6.
If the system or product characteristics are to be changed from the

original application for which the pump was selected, Wright Flow
Technologies Limited or their authorised distributor should be consulted
to ensure the pump is suitable for the new application.

2.2 Wright Flow Technologies Limited Distributors.

Wright Flow Technologies Limited distributes its products internationally
via a network of authorised distributors. Throughout this manual where
reference is made to Wright Flow Technologies Limited, service and
assistance will also be provided by any Wright Flow Technologies
Limited authorised distributor for Classic+.

2.3 Receipts and Storage.

Upon receipt of the pump, immediately examine it for any signs of

visible damage. If any damage is noted, contact Wright Flow
Technologies Limited or your Wright Flow Technologies Limited
distributor and clearly mark upon the carriers’ paperwork that the goods
have been received in a damaged condition, with a brief description of
damage.

Page 10

If the pump is not required for immediate installation then it should be
stored in a clean, dry environment. It is recommended that storage
temperature should be between –10° and 40°C (14°F and 105°F).

Further to the above, if the pump is not intended for installation or use within
18 months or more then refer to Wright Flow Technologies Limited, or the
Wright Flow Technologies Limited authourised distributor for storage
recommendations.

2.4 Cleaning.

The Classic+ pump series is suitable for both manual cleaning and CIP
(Cleaning In Place), refer to section 3.3.2.

It is recommended that the exterior of the pump be cleaned periodically with a
non-aggressive, non-abrasive cleaning solution.

2.5 Pump Model Designation.

The designations of pump models in the Classic+ range are as follows:

CP10/0005/12 CP20/0020/12 CP30/0069/12 CP40/0180/12 CP50/0351/12
CP10/0008/08 CP20/0031/07 CP30/0113/07 CP40/0250/07 CP50/0525/08
CP10/0011/05

This information, together with the pump serial number, should be
provided when requesting additional information on the pump or when
ordering spare parts. The pump serial number is stamped on the pump
nameplate and the rotorcase, (refer to section 2.6, Figs 2 and 3).

For the maximum operating pressures, temperatures and speeds refer
to section 3.2, Fig 6.

Fig 1 CP designated models only.

CP 30 0069

12 / /

P

UMP

R

ANGE

D

ISPLACEMENT

(

LTRS/REV

)

M

ODEL

S

IZE

M

AX

P

RESSURE

(

BAR)

Page 11

2.5.1 ATEX Information

ATEX Pump Requirements
Please be aware that mechanical seals are a source of heat and must never be
allowed to run dry. We would recommend provision be made to ensure that there is
a flow of fluid around the pump seals at all times. If there is a risk of the supply
being interrupted, we would recommend that the flush on the seals be fitted with a
flow detection device. The surface temperature of the pump is dependent on the
temperature of the pumped fluid and due account of this should be taken whilst
undertaking your risk assessment of the installation. These pumps are rated to T3.

2.5.2 Equipment Groups & Categories

TEMP - T3

SERIAL NO:

ex

II - 2 - G/D

Group

II.

Category

Unit is suitable for

environments containing

dust or gas

Temperature Class.

Page 12

2.6 Pump Model and Serial Number.

Should you require any information regarding your Classic+ rotary lobe
pump contact Wright Flow Technologies Limited or your Wright Flow
Technologies Limited distributor, providing the pump model and serial
number as stated on the pump nameplate, see Fig 2, which is fixed to
the pump gearbox cover.

Should this be damaged or missing, the pump serial number is also stamped
on opposite corners of the rotorcase or on the rear face of the rotorcase, (see
Fig 3).

Fig 2 Nameplate

Fig 3 Serial Number Position on Rotorcase

12345/A/67

12345/A/67

Or

Page 13

2.7 Standard Pump Component Terms.

ROTORS

FRONT COVER

ROTOR

RETAINER

ROTORCASE

BEARING

HOUSING

FRONT

BEARINGS

GEARBOX

COVER

BREATHER

/FILLER CAP

REAR

BEARINGS

DRIVE

SHAFT

DRIVEN

SHAFT

TIMING

GEARS

Fig 4 Pump Component Terms

Page 14

3.0 General.

3.1 Classic+ Pumping Principal.

The pumping action of the rotary lobe pump principle is generated by the
contra rotation of two pumping elements (rotors) within a chamber (rotorcase)

- see Fig 5. The rotors are located on shafts, which in turn are mounted within
an external gearbox and supported by the bearings; the timing gears are also
located on the shafts. The timing gears transfer the energy from the drive
shaft to the driven shaft, synchronising the rotors such that they rotate without
contact with each other.

As the rotors pass the suction port, see Fig 5a, the cavity generated increases
creating a pressure decrease, which induces the pumped medium to flow into
the rotorcase.

The pumped medium is carried around the rotorcase by the rotors; see Fig 5b
and 5c, to the discharge side of the pump, Fig 5d. Here the cavity decreases
and the pumped medium is discharged from the rotorcase, Fig 5e.

For pump component terms see Fig 4.

Fig 5 Rotary Lobe Pumping Principle.

Page 15

3.2 Classic+ Range Operating Parameters.

The maximum pressure and speed operating parameters are given in Fig 6. In
practice these may be limited due to the nature of the product to be pumped
and/or design of the system in which the pump is to be installed. Consult
Wright Flow Technologies Limited or your Wright Flow Technologies Limited
distributor for assistance.

The operating temperature limit of the pump is determined by the rotor
clearance. For the CP10, CP20, CP30 and CP40 series pumps there are
three rotor clearance bands (class A, B and C), and two (class B and D) for
the CP50 series pumps.

If the system or product characteristics are to be changed from the original
application for which the pump was selected, Wright Flow Technologies
Limited or their authorized distributor should be consulted to ensure the pump
is suitable for the new application.

The pump should not be subjected to sudden temperature changes to avoid
the risk of damage from sudden expansion/contraction of components. Care
should be taken when selecting pumps for handling liquids containing
abrasive particles as these may cause wear of pump head components. For
advice or assistance contact Wright Flow Technologies Limited or your Wright
Flow Technologies Limited distributor.

WARNING

Page 16

Classic+ Series

Operating Temperature Limit (°C)

Class A Class B Class C Class D

CP10, 20, 30, 40 70 100 150 N/A

CP50

N/A 100 N/A 180

N/A = Not Available

Fig 6 Operating Parameters

Pump Range Theoretical Displacement

Nominal

Connection

Size

Max Diff.
Pressure

Max.

Speed

Max
Speed @
Max Diff.
Pressure

Max Diff.

Pressure @

Max Speed

ltr/rev

Imp.gal

/100 rev

US gal

/100 rev

mm inches bar psi rev/min rev/min bar psi

CP10/0005/12 0.046 1.01 1.22 25 1 12 175 1400 1000 8.5 120

CP10/0008/08 0.083 1.83 2.19 38 1.5 8 120 1400 1000 5.5 75

CP10/0011/05 0.111 2.44 2.93 38 1.5 5 70 1400 1000 3.5 50

CP20/0020/12 0.202 4.44 5.34 38 1.5 12 175 1000 750 8.5 120

CP20/0031/07 0.313 6.89 8.27 50 2 7 100 1000 750 5.0 70

CP30/0069/12 0.694 15.27 18.34 50 2 12 175 750 550 8.5 120

CP30/0113/07 1.125 24.75 29.72 76 3 7 100 750 550 5.0 70

CP40/0180/12 1.800 39.60 47.56 76 3 12 175 700 520 8.5 120

CP40/0250/07 2.500 55.00 66.05 101 4 7 100 700 520 5.0 70

CP50/0351/12 3.514 77.31 92.84 101 4 12 175 650 420 8.5 120

CP50/0525/08 5.250 115.50 138.70 152 6 8 115 600 420 5.5 75

CP20/CP30 High Efficiency Operating Parameters.

CP20/0020/07 0.202 4.44 5.34 38 1.5 7 100 1000 750 5.0 70

CP20/0031/04 0.313 6.89 8.27 50 2 4 55 1000 750 3.0 40

CP30/0069/07 0.694 15.27 18.34 50 2 7 100 750 520 5.0 70

CP30/0113/04 1.125 24.75 29.72 76 3 4 55 750 520 3.0 40

Page 17

3.3 System Design.

3.3.1 System Design and Installation.
When incorporating any pump into a system it is considered good practice to

minimize piping runs and the number of pipe fittings (tees, unions, bends etc.)
and restrictions. Particular care should be taken in designing the suction line,
which should be as short and straight as possible with a minimum of pipe
fittings to minimise restricting product flow to the pump. The following should
be considered at the design stage of any system

Be sure ample room is provided around the pump to allow for:

− Access to the pump and drive for routine inspection and maintenance, i.e.

to remove pump front cover and rotors.

− Ventilation of the drive to prevent over heating.
The exterior of the pump unit may exceed 68°C (154°F),

Appropriate measures must be taken to warn or protect operators.
The pump must not be used to support piping. All piping to and from the pump

unit must be independently supported. Failure to observe this may distort the
pump head components or assembly and cause serious consequential
damage to the pump.

Valves should be provided adjacent to the pump suction and discharge
connections to allow the pump to be isolated from the system for routine
inspection and maintenance.

Rotary lobe pumps are of the positive displacement type and therefore an
overload protection device must be provided. This can take the form of:

− An in-line pressure relief system, i.e. external to the pump.

− Incorporation of a torque-limiting device in the drive system.

It is recommended that all piping and associated equipment from the tank to
the discharge point is thoroughly cleaned before installation of the pump to
avoid the possibility of debris entering the pump and causing damage.

Pressure gauges should be installed adjacent to the pump suction and
discharge connections such that system pressures can be monitored. These
gauges will provide a clear indication of changes in operating conditions and
where a relief valve is incorporated in the system, will be necessary for setting
and checking the functioning of the valve.

It is imperative that the suction condition at the pump inlet meets the Net
Positive Suction Head required (NPSHr) by the pump. Failure to observe this
could cause cavitation, resulting in noisy operation, reduction in flow rate and
mechanical damage to the pump and associated equipment.

WARNING

WARNING

WARNING

WARNING

Page 18

The Net Positive Suction Head available (NPSHa) from the system must
always exceed the Net Positive Suction Head required (NPSHr) by the pump.

Observing the following general guidelines should ensure the best possible
suction condition is created.

− Suction piping is at least the same diameter as the pump connections.

− The length of suction piping is kept to the absolute minimum.

− The minimum number of bends, tees and pipework restrictions are used.

− Calculations to determine system NPSHa are carried out for the worst

condition see below.

Should advice on pump or system NPSH characteristics be required contact
the factory or their authorised distributor.

10.0 Meters (32.8 Feet) Water Column

Suction Lift
Or Vacuum

Atmospheric

Pressure

Suction

Head

NPSH

Available

Suction Line
Friction Loss

Vapour

Pressure

NPSH

Available

Suction Line

Friction Loss

Vapour

Pressure

For Suction Lift

Or Vacuum
Conditions.

For Conditions

With Positive

Suction Head.

Atmospheric

Vacuum

Fig 7 NPSH

WARNING

Page 19

When installing a pump complete with base plate, motor and drive, the following
guidelines must be observed:

a) The preferred drive arrangement for any rotary lobe pump is in-line

direct coupled. If an alternative is required please contact Wright Flow
Technologies Limited or your Wright Flow Technologies Limited
distributor.

b) Flexible couplings must always be incorporated and correctly aligned

within the limits recommended by the coupling manufacturer. To
check coupling alignment rotate the shaft by at least one full revolution

and ensure that the shaft rotates smoothly.
Couplings of a non-flexible design must never be used.
c) Couplings must always be enclosed in a suitable guard to prevent

contact with rotating parts, which could result in personal injury.

Guards should be of suitable material, (see d) and of sufficiently rigid

design to prevent contact with rotating parts under normal operating

conditions.
d) When the pump is installed in a flammable or explosive environment,

or is used for handling flammable or explosive materials, special

consideration must be given. Not only to the safety aspects of the

drive unit enclosure but also to the materials used for both the

coupling and the guard to eliminate the risk of explosion.
e) Base plates must be secured to a flat level surface such that distortion

and misalignment are avoided. Once base plates are fastened in

position the drive alignment must be re-checked, (see b).
f) When using electric motor drives, ensure that the electrical supply is

compatible with the drive and controls and that the method of wiring is

correct for the type of starting required by the motor i.e. Direct On

Line, or other similar method. Ensure all components are correctly

grounded.

3.3.2 Installations with CIP Systems.

The Classic+ pump range is designed to be effectively cleaned by the CIP
procedures recommended for in place cleaning of process plant. It is
recommended that a differential pressure of 2 to 3 Bar (30 to 45 psi) be
developed across the pump head during cleaning in order to develop the
necessary fluid velocities required for thorough cleaning.

Page 20

3.4 Start Up Procedure.

- Check that all piping and associated equipment are clean and free from
debris and that all pipe connections are secure and leak free.

- For pumps fitted with flushed product seals check all auxiliary services
are in place and connected and provide sufficient flow and pressure for
flushing purposes, refer to section 7.0.

- Ensure lubrication is provided for both pump and drive. The Classic+ is
shipped without oil as standard and should be filled to the level of the
oil sight glass - refer to section 8.3 for pump oil capacities and grades.

- If an external relief valve is incorporated in the system, check that it is set
correctly. For start up purposes, it is considered good practice to set the
relief valve lower than the system design pressure. On completion of
start up, the relief valve should be reset to the required setting for the
application. The required setting should never exceed the lower of either
the pumps maximum pressure rating or the system design pressure. For
setting integral relief valves refer to sections 3.8.1 and 3.8.2.

- Be sure both suction and discharge valves are fully opened and that pipe
work is free from all obstructions. The Classic+ is a positive displacement
type pump and should therefore never be operated against a closed
valve as this would result in pressure overload, resulting in damage to
the pump and possibly the system.

- Make sure that the drive shaft rotation is correct for the direction of flow
required. See Fig 8.

WARNING

WARNING

WARNING

WARNING

WARNING

WARNING

Page 21

Fig 8 Rotation against Suction and Discharge

- Be sure product is available in the suction vessel before starting the
pump. This is very important for pumps fitted with un-flushed product
seals, as these sealing arrangements must never be allowed to run dry.

- Before beginning operation, it is considered good practice to momentarily
start/stop the pump to check the direction of rotation and ensure that the
pump is free of obstructions. Once this has been carried out, begin
operation keeping a visual check on suction and discharge pressure
gauges and monitor the pump temperature and absorbed power where
possible.

3.5 Shutdown Procedure.

When shutting the pump down, stop pump, close both the suction and
discharge valves and ensure that the necessary safety precautions are taken:

- The prime mover power source has been isolated.

- If installed, pneumatically operated integral relief valve has been
depressurised.

- Flushed product seal auxiliary services have been isolated and
depressurised.

- Pump head and piping have been drained and purged.

- Before undertaking any work on the pump refer to sections 4, 5, 6 and 7.

WARNING

Page 22

3.6 Routine Maintenance.

- Check oil levels regularly.

- Change the oil every 12 months or 3000 operating hours, whichever is the

sooner.

- For lubricant capacities and grades refer to section 8.3.

3.7 Heating and Cooling Jackets

See Fig 9 and Fig 10.
The Classic+ can be supplied with a jacketed front cover and rotorcase for

circulation of a heating/cooling media.
The front cover and rotorcase jacket ports are strategically positioned such

that the required thermal effect acts on the pumping chamber.
The pressure rating of the Classic+ series jacketed front cover and rotorcase

is 3 Bar (50 psi) and this should not be exceeded without consulting Wright
Flow Technologies Limited or your local Wright Flow Technologies Limited
distributor.

Heating/cooling of the pump head is used to maintain, rather than
increase/decrease the temperature of the pumped media and should be used
as part of a complete system where suction and discharge lines and vessels
are also heated/cooled.

Where heating/cooling devices are employed, the heating/cooling media
should be circulated 15-20 minutes prior to pump start-up and should be
allowed to continue for a similar period of time after the pump has been shut
down. Where a CIP cycle is employed as part of the process, then the
heating/cooling media should continue to be circulated during the cleaning
cycle.

WARNING

Page 23

Fig 9 Dimensions of Front Cover Jacket for Heating/Cooling.

Model

Millimetres Inches

A6 M1 A6 M1 Y4

CP10/0005/12
CP10/0008/08
CP10/0011/05
CP20/0020/12
CP20/0031/07
CP30/0069/12
CP30/0113/07
CP40/0180/12
CP40/0250/07
CP50/0351/12
CP50/0525/08

50.0

50.0

50.0

64.0

64.0

92.5

92.5

130.0

130.0

175.0

175.0

52.0

61.0

61.0

71.0

81.0

81.0

96.0

108.0

123.0

115.0

138.0

1.97

1.97

1.97

2.52

2.52

3.64

3.64

5.12

5.12

6.89

6.89

2.05

2.40

2.40

2.80

3.19

3.19

3.78

4.25

4.84

4.53

5.43

¼”
¼”
¼”
½”
½”
½”
½”
½”
½”
½”
½”

Page 24

Fig 10 Dimensions of Rotorcase Jacket for Heating/Cooling.

Model

Millimetres Inches

A7 BJ D1 M2 A7 BJ D1 M2 Y5
CP10/0005/12
CP10/0008/08
CP10/0011/05
CP20/0020/12
CP20/0031/07
CP30/0069/12
CP30/0113/07
CP40/0180/12
CP40/0250/07
CP50/0351/12
CP50/0525/08

70.0

70.0

70.0

80.0

80.0

118.0

118.0

156.0

156.0

191.0

191.0

56.0

56.0

56.0

64.0

64.0

93.0

93.0

125.0

125.0

155.0

155.0

156.0

156.0

156.0

216.0

216.0

280.0

280.0

352.0

352.0

430.0

430.0

3.0

2.0

7.5

0.0

1.0

1.0

3.5

2.5

3.5

8.0

10.0

2.76

2.76

2.76

3.15

3.15

4.65

4.65

6.14

6.14

7.52

7.52

2.20

2.20

2.20

2.52

2.52

3.66

3.66

4.92

4.92

6.10

6.10

6.14

6.14

6.14

8.50

8.50

11.02

11.02

13.86

13.86

16.93

16.93

0.12

0.08

0.30

0.00

0.04

0.04

0.14

0.10

0.14

0.31

0.39

¼
¼
¼
¼
¼
½
½
½
½
½
½

Page 25

3.8 Integral Pressure Relief Valves
See Fig 11, 12, 13 and 14.

The Classic+ models CP10, CP20, CP30 and CP40 can be supplied with
integral pressure relief valves. For the CP10, CP20 and CP30 both spring and
air loaded versions are available. The function of the valves can be further
enhanced with the option of manual or airlift override, offering particular
benefits where CIP or SIP procedures are employed. Valves incorporating this
option can be opened to regulate the flow of the cleaning media through the
pump chamber, thereby avoiding the need for manual cleaning or external
bypass.

Where the pump is mounted onto a portable base plate, complete with motor
and drive to be used as a mobile set, an integral pressure relief valve should
be installed.

The Classic+ integral pressure relief valves available include:
Spring Loaded - see Fig 11.

- Valve can be set to the required pressure relief setting.
Spring Loaded with Manual Lift - see Fig 12.

- Valve can be set to the required pressure relief setting. Manual lift

override can be used to open valve without disturbing pressure relief
setting.

Spring Loaded with Air Lift - see Fig 13.

- Valve can be set to the required pressure relief setting. Airlift override,

which operates on an air supply of up to 7 Bar (102 psi) depending on
pressure relief setting, can be used to open valve without disturbing
pressure relief setting.

Air Loaded with Air Lift - see Fig 14.

- Valve, which operates on an air supply of up to 7 Bar (102 psi) regulated

for required setting, can be set to the required pressure relief setting. Airlift
override, which operates on an air supply of up to 7 Bar (102 psi)
depending on pressure relief setting, can be used to open valve without
disturbing pressure relief setting.

Air actuated relief valves can be operated remotely and interfaced with other
elements of the system or process control.

Page 26

Integral pressure relief valves are normally used to protect the pump from the
effects of increases in system pressure caused, for example, by a restricted or
closed discharge line. In response to a pressure increase, the valve opens
and internally circulates the pumped media within the pump chamber. When
the valve opens, because the volume of liquid circulating is relatively small,
the temperature of the liquid in the pump chamber may rise if the pump
continues to operate for an extended period. In severe cases, this may result
in temperatures in excess of the pumps operating limits, or vaporisation of the
liquid, both of which should be avoided. For these reasons when the valve is
activated the cause of the system pressure increase should be eliminated as
continuous operation of the pump with the valve open is not recommended
and may cause severe damage to the pump.

If the pump on which the valve is fitted is to be installed within either a
pressurised system or one incorporating a vessel under vacuum then the
application of the valve should be referred to Wright Flow Technologies
Limited.

The selection, setting and application of integral relief valves is influenced by
the viscosity and nature of the pumped media, the pumps operating speed
and the required pressure relief setting and mode of operation. For these
reasons and to cover the diverse range of products, the conditions under
which they are pumped and application demands, it is not practical to factory­set integral relief. Valves and the setting of the valves should be carried out on
site, under the proposed duty conditions for which the pump and valve were
selected.

For setting and operating Classic+ integral relief valves refer to sections 3.8.1
and 3.8.2. Before beginning the relief valve setting procedure the pump should
be installed, refer to section 3.3.1, paragraph (vi), with a pressure gauge in the
discharge line adjacent to the pump discharge port.

3.8.1 Setting and Operating Spring Loaded Valves
See Fig 11, 12 and 13.

- Remove cover (108). For integral relief valve with manual lift, see Fig 12;

first remove nut (129) and hand wheel (111).

- Unscrew nut (107) using pry bar in holes provided to relieve spring

compression. For integral relief valve with airlift, see Fig 13, the air
cylinder must be exhausted prior to unscrewing the nut (107).

- Start pump. - refer to section 3.4.

- Screw in nut (107) using pry bar in holes provided until the required

pressure relief setting is reached.

Note: Care should be taken not to exceed the lower of either the pump's

maximum pressure rating or the system design pressure.

WARNING

WARNING

Page 27

- Reinstall cover (108). For integral relief valve with manual lift, see Fig 12;

reinstall hand wheel (111) and nut (129).

- The relief valve is now set.
For Integral Relief Valve with Manual Lift - see Fig 12.

- To operate the manual lift, turn the hand wheel (111) clockwise, which will

lift the valve head (102/128). To resume normal relief valve operation,
turn the hand wheel (111) counter-clockwise.

For Integral Relief Valve with Air Lift - see Fig 13.

- To actuate the airlift, connect an air supply not exceeding 7 Bar (102 psi)

to the cylinder (123), connection 'B', which will lift the valve head (112).
To resume normal relief valve operation, exhaust the cylinder (123).

3.8.2 Setting and Operating Air Loaded Integral Pressure Relief Valves
See Fig 14.

- Connect an air supply, not exceeding 7 Bar (102 psi), via a regulating

valve to the relief valve connection 'A' in the cylinder (114). Do not turn on
the air supply.

- Start the pump, refer to section 3.4.

- Using the regulating valve, gradually increase the air pressure until

required pressure relief setting is reached. The air pressure must not
exceed 7 Bar (102 psi).

- The relief valve is now set.
Note: Care should be taken not to exceed the lower of either the pump's

maximum pressure rating or the system design pressure.

- To use the air lift system, the regulated air supply must be routed through

a change-over valve in order to transfer air from the relief valve load air
chamber, connection 'A', to the lift air chamber, connection 'B', while
depressurizing the load chamber and vice versa. The change-over valve
will actuate the air lift which will lift when the air supply is diverted to
connection 'B', and will close, restoring normal relief valve operation, when
the air supply is diverted back to connection 'A'.

DANGER

Under no circumstances should any attempt be made to disassemble a

pressure relief valve which has not had the spring pressure relieved, is still

connected to a pressurized air supply or is mounted on a pump that is

operating. Serious personal injury or pump damage may occur.

WARNING

Page 28

Fig 11 Spring Loaded Integral Pressure Relief Valve CP10, CP20, CP30, CP40.

Fig 12 Spring Loaded Integral Pressure Relief Valve with Manual Lift CP10, CP20
and CP30.

Page 29

Fig 13 Spring Loaded Integral Pressure Relief Valve with Air Lift CP10, CP20
and CP30.

Fig 14 Air Loaded Integral Pressure Relief Valve with Air Lift CP10, CP20, CP30
and CP40.

Page 30

4.0 Classic+ Disassembly and Assembly.

Before starting any work on the pump the recommended Shutdown Procedure
should be followed, refer to section 3.5.

While disassembling or assembling the pump it is essential to ensure that the
pump and/or components are secured to provide adequate stability.

Large pump components or sub-assemblies should be installed using suitable
devices. Use threaded holes for the attachment of lifting eyes where
appropriate.

During disassembly or before assembly, all components should be inspected
for fit, wear and damage. If worn or damaged the components should be
replaced.

The position of all parts should be identified as they are removed to ensure
they are reinstalled in the same position.

Lipseals and o-rings are incorporated within the gearbox assembly to contain
the lubricant for the bearings and timing gears. Regular inspection and correct
maintenance of these items will ensure that the lubrication is sustained and
the pump maximum working life is achieved. To ensure this, it is extremely
important that care is taken when removing and replacing new o-rings and
lipseals. When removing and replacing lipseals ensure that the location bore
for the outside diameter and the seat for the back of the lipseal is not
damaged as this may create a leak path for the lubricant.

When removing lipseals or o-rings care should be taken to avoid cutting or
tearing the sealing faces as they pass over keyways, splines, threads or other
potentially sharp or abrasive edges. All lipseals and o-rings should be carefully
examined and if damaged in any way, be replaced.

All o-rings and sealing lips of lipseals should be lightly lubricated with an
appropriate lubricant (suitable for application) before installing.

When installing lipseals do not allow the rear face to come into contact with
bearings or other rotating parts.

Prior to beginning assembly, ensure all parts are clean and free from burrs or
damage. Where a vice is to be used then this should be installed with
protective jaws to avoid damage to components. Do not hammer or apply
undue force to install or position components.

All fasteners are required to be tightened to the required torque setting during
assembly, refer to section 8.2.

WARNING