WEL-TECH CP Series User manual

An ISO 9001:2015
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [email protected]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 1 of 25
CP Series
Centrifugal pump
USER MANUAL
‘CP’ Series
W E L - T E C H E Q U I P M E N T S
Plot No. 57/9, Ph I, G.I.D.C. Vatwa,
Ahmedabad, Gujarat, India, 382 445
Ph. No. (079) 403258489925040029
E-mail:
[email protected]
[email protected]
Web : www.weltechpumps.com

An ISO 9001:2015
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Em [email protected]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 2 of 25
CP Series
Table of contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
General information and safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Service and support
Inspection of delivered items
Lifting
Storage
General
Pump description
Application
Installation
Safety
Flushing
Environment
Mounting
Installation of the set
Assembly
Alignment of the coupling
Tolerances for aligning coupling
Piping
Mounting accessories
Commissioning
Precautions before commissioning
Preparation of lubrication
Preparing the unit for commissioning
Checking the sense of rotation
Starting the pump
Adjustment of shaft sealing
Stuffing box packing
Mechanical seal
Control
Installation guidelines for pump piping
Maintenance
Daily maintenance
Shaft sealing
Gland packing
Mechanical seal
Lubrication of the bearings
Grease lubricated bearings (L1,L2)
Oil-bath lubricated bearings (L3,L4)
Environmental influences

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 3 of 25
CP Series
Faults
Cause of failure
Trouble shooting
Fault finding chart
Possible causes
Technical data
Lubrication
Oil
Oil contents
Grease
Interchangeability chart for ‘CP’ series
Pump parts
Cross sectional drawing ‘CP’ series
‘CP’ pump part list
Cross sectional drawing ‘CP-A’ series
‘CP-A’ pump part list
Pump Disassembly

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 4 of 25
CP Series
Introduction
Preface
This manual provides the information for proper functioning and maintenance
of the pump and contains instructions to prevent possible accidents and damages
and to ensure the safe and smooth functioning of the pump.
Before commissioning of the pump, read the manual carefully and strictly follow the
instructions.
General information and safety instruction
The product supplied by WELTECH has been designed with safety in mind.
Pump installation area must be kept clean and free of obstructions that may
restrict safe access to the controls and maintenance access point
The pump nameplate is fitted to each unit must not be removed. Loss of it
could make identification impossible which in turn could cause difficulty in
obtaining spare parts. If accidental loss occurs, contact WTE immediately.
Access to the equipment should be restricted to the personnel responsible for
installation, operation and maintenance and they must be trained adequately
qualified and supplied with appropriate tools for their respective tasks.
All personnel that are responsible for installation-operation-maintenance of
the pump must study the product instruction manual before any work is done
and that they will comply with all local and industry based safety instructions
and regulations.
Safety glasses or goggles should be worn where working with pressurized
systems and hazardous substances. Other personal protection equipments
must be worn where local rules apply.

Do not wear loose clothing or jewelry which could catch on the controls or
become trapped in the equipments.
Read the instruction manual prior to installation and confirm that the manual is
relevant copy by comparing pump type on the nameplate and with that on the
manual.
Note the ‘limits of product application and permissible use’ specified in the
manual. Operation of the equipment beyond those limits will increase the risk
from hazardous and may lead to premature hazardous pump failure.
Clear and easy access to all controls, gauges, and dials etc. must be
maintained at all the times.
Hazardous or flammable material must not be stored in pump rooms unless
safe area or racking and suitable containers have been provided.

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 5 of 25
CP Series
Improper installation, operation or maintenance of this WELTECH product
could result in injury or death.
Warranty
WELTECH warrants the pump supplied by us is free from defective material
and faulty workmanship. This warranty holds good for a period of 12 months from the
date of commissioning of the pump or 18 months from the date of dispatch from our
factory, whichever is earlier. Our liability in respect of any complaint is limited to
replacing part/parts free of charge. Ex-works or repairs of the defective part/parts
only to the extent that such replacement/repairs are attributable to our arise solely
from faulty workmanship or defective material.
Warranty is void for Mech.seal if Brocken or dry run of pump.
This warranty holds good only for the products manufactures by us.
Service and support
This manual is intended for technicians and maintenance staff and for those
who are in charge of ordering spare parts.
This manual contains the spare and replacement parts recommended by
WEL-TECH EQUIPMENTS.
The pump number is stated on the nameplate. Please refer to this number
and the other data mentioned on the nameplate when corresponding or ordering
parts.
Inspection of delivered items
Check the consignment immediately on arrival for damage and conformity with the
advice note.
In case of damage and/or missing parts, have a report drawn up by the carrier at
once.
Lifting
If a pump or a complete pump unit has to be lifted, the slings should be fixed as
shown in figure 1.

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 6 of 25
CP Series
General
Figure 1 Lifting instruction pump set CP
Note: Proper care should be taken to protect pump and prime mover and/or
paint at contact area of sling or rope at the time of lifting.
Storage
In case the pump is not immediately being used, the pump shaft has to be rotated
manually twice a week.
Pump description
“CP” Pump is a range of horizontal non-self-priming centrifugal pumps
according to DIN 24255. Flange dimensions, bolt circle and number of holes comply
with DIN 2533 ND 16 and other standard as per request.
The pump is driven by a standard IEC foot motor. The power is transmitted through a
coupling.
Hydraulic range:
Delivery head up to 100 Mtr.
Capacity of up to 350 m3/hr.
1) THE BOOKLET COVERS INSTRUCTION FOR FOLLOWING MODELS OF “CP”
SERIES PUMP
SHAFT
GROUP
CP SERIES PUMP MODEL IN
CI/BRONZE
CONSTRUCTION
0
25
-
125
0+ 25-160,32-200s.
1 32-125,32-160,32-200,32-250,40-125,40-200,40-250,50-125,50-
160,50
-
200,50
-
200,
65
-
125
,65
-
160,65
-
200,80
-
160
2 65-250,80,200,100-160,100-200,125-250,200-200

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 7 of 25
CP Series
Installation
1. WEL-TECH “CP” Series are of back pull out design which enables to removes the
rotating unit of pump for inspection and repairs without disturbing the pipe
connection and motor by using spacer type coupling.
2. “CP” Series pump covers the range by four shaft group thereby reducing inventory
and achieving interchangeability of parts.
3. When the pump is received, sometime before the actual use of pump, it should be
inspected and located in dry place .the coupling should be rotated one in a month to
prevent pitting of bearing surface.
Application
In general, the “CP” pumps can be used for thin, clean, or slightly polluted liquids.
The liquids should not affect the pump materials. The maximum allowed system pressure
and temperature and the maximum speed depend on the pump type and the pump
construction.
Please do not use the pump for purposes other than for which it is delivered.
Safety

Read this manual carefully before installing and commissioning pump.
Non observance of these instructions may cause serious damage to the pump
and that will not be covered by our guarantee terms. Follow the instructions step
by step.
Make sure the motor cannot be started when work is done to the pump-motor
combination and running parts are insufficiently shielded.
When installing the pump unit, take appropriate protection and warning measures
to prevent contact with hot pump parts.
If danger arises in case of static electricity. The entire pump unit should be earth
properly.
If there is a danger that the pumped liquid might be harmful to men or the
environment, the user should take appropriate measures for safe drainage. Also
possible leakage fluid from the shaft seal should be safely discharged.
Flushing

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 8 of 25
CP Series
Before putting the pump in to operation, drain off any preservative agent and flush
the pump thoroughly with hot water.
Environment
The foundation must be hard, level and flat
The area in which the pump unit is to be placed should be adequately ventilated.
A too high ambient temperature and air humidity, as well as a dusty environment
may have a negative effect on the functioning of the pump.
Around the pump unit there should be enough space to operate and if
necessaries repair the pump.
Behind the cooling air inlet of the motor there should be a free area of at least ¼
of the electric motor diameter, to ensure unobstructed air supply.
Mounting
Installation of the set
Pump and motor shafts of complete sets are adjusted perfectly in line in the
works. In case of permanents arrangements place the base plate on the foundation
with the aid of shims and tighten the nuts on the foundation bolts carefully.
The check the alignment of pump and motor shafts and realign, if necessary
according to the instruction in Figure 1.
Assembly
If the pump and the electric motor still have to assembled, proceed as follows:
1. Mount the two coupling halves on the pumps and motor shaft respectively
2. Place the pump on the foundation slab. Secure the pump with bolts.
3. Place the electric motor on the foundation slab. Between the two coupling halves
there should be a gap of 3 mm.
4. Place some copper shims under the feet of the electric motor. Secure the electric
motor with bolts.
5. Align the coupling according to the following instruction.
Alignments of the coupling
1. Place a ruler (A) on the coupling. The ruler should touch both coupling halves across
the whole width. See figure 3.
2. Do the same check against both sides of the coupling near the axis.
3. For all security the alignment is also checked with a pair of outside calipers (B) at 2
diametrically opposite points of the side surfaces of the coupling halves. See fig.3

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 9 of 25
CP Series
Figure 3 Aligning of the coupling for SM
Tolerances for aligning coupling
The maximum allowable tolerances in the alignment of the coupling halves are
shown in the table below. See figure 4.
Va
Va
Vr
min
max.
Figure4
Aligning tolerances:
Outer diameter
Coupling (mm) Va min. (mm) Va max. (mm) Va max-Va min. (mm) Vr max (mm)
81
-
95
2
5*
4
6*
0.15
0.15
96-110 2 5* 4 6* 0.18 0.18
111-130 2 5* 4 6* 0.21 0.21
131-140 2 5* 4 6* 0.24 0.24
141-160 2 6* 6 7* 0.27 0.27
161-180 2 6* 6 7* 0.30 0.30
181-200 2 6* 6 7* 0.34 0.34
201
-
225
2
6*
6
7*
0.38
0.38
*= for spacer coupling.

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 10 of 25
CP Series
Commissioning
Piping
The piping to the suction and delivery connections must fit exactly and must not be
subject to stress during operation.
The passage of the suction pipe must be amply dimensioned. This pipe should be as
short as possible and run towards the ump in such a way that no air pockets can
arise. If this is not possible, a venting facility should be provided at the highest point
of the pipe.
If the inside diameter of the suction pipe is larger than the suction connection of the
pump, an eccentric reducer should be applied to prevent air pockets and whirls.
If there is a risk that this pressure might be exceeded, for instance because of an
excessive inlet pressure, appropriate measures should be taken by mounting a
safety valve in the piping.
Sudden changes in the rate of flow can lead to high pressure impulses in the pump
and the piping (water shock). Therefore, don’t use quick acting closing devices,
valves etc.
Mounting accessories
Mount any parts that may have been supplied separately.
If the liquid does not flow towards the pump, mount a foot valve at the bottom of
the suction pipe. If necessary, combine this foot valve with a suction strainer to
prevent impurities from being drawn in.
When mounting, place temporarily (for the first 24 operating hours) fine gauze
between suction flange and suction pipe so as to prevent internal parts from
being damaged by foreign matter. If the risk of damage continues to exist, mount
a permanent filter.
In case of a pump with a cooled stuffing box (shaft sealing variant S4), connect
the cooling chamber to the cooling system.
Precaution before commissioning
Pump
Construction with stuffing box: whether the gland nuts have not been over tightened.
If necessary, loosen the gland nuts and retighten them by hand.
Check whether the shaft turns freely. Do this by turning the shaft end at the coupling
a few times by hands.
Motor

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 11 of 25
CP Series
If driven by an electric motor:
Check whether the fuses have been mounted.
Engine
If driven by a combustion engine:
Check whether the room in which the engine is placed is well ventilated.
Check whether the exhaust of the engine is not obstructed.
Before starting the engine check the oil level
Never turn the engine in a closed room.
Preparation of lubrication
The bearing of pump provided with grease-lubricated is filled with grease at
the time of delivery.
Pump provided with grease-lubricated bearings are supplied without oil. See
Technical data for the specifications of the oil to be used.
Fill the oil sump through the oil filling orifice up to the bottom of the constant
level oiler.
After that, fill the constant level oiler entirely.
Preparing the unit for commissioning
Proceed as follows both when the unit is put in to operation for the first time and after the
pump has been overhauled:
1. Fully open the stop valve in the suction pipe. Close the delivery stop valve.
2. Fill the pump and the suction pipe with the liquid to be pumped.
3. Turn the pump shaft a few times by hand and add more liquid, if necessary.
Checking the sense of rotation
The sense of rotation of the pump is indicated by an arrow. Check whether the
sense of rotation of the motor corresponds with that of the pump.
Let the motor run for only a short time and check the sense of rotation.
If the sense of rotation is not correct, change connecting wire of motor so as to
match with the rotation of pump.
Mount the coupling guard.
Starting the pump
Open the stop valve in the supply piping for flushing or cooling liquid, if the pump is
supplied with a flushing or cooling system. When flushing a double mechanical seal ,
the appropriate pressure at the impeller hub.
Start the pump.
As soon as the pump is under pressure, slowly open the delivery stop valve until the
working pressure is attained.

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 12 of 25
CP Series
Adjustments of shaft sealing
Stuffing box packing
After the pump is started, the stuffing box will show a certain amount of leakage.
Because of the expansion of the packing fibers, this leakage will gradually decrease.
Make sure that the packing never runs dry. To prevent this, loosen the gland nuts to
the extent that the stuffing box leaks drop wise. As soon as the pump has reached
the proper temperature (and leakage is still too much) the gland can be adjusted
permanently.
Tighten both gland nuts, one after the other, a quarter turn.
Wait 15 minutes after each adjustment before making the next adjustment.
Continue in this way until an acceptable drop wise leakage has been attained.(20-30
drops/minutes)
Mechanical seal
A mechanical seal may never show visible leakage.
Control
If a pump is in operation pay attention to be following:
The pump should never run dry.
Never use a stop valve in the suction pipe to control pump capacity. The stop valve
should always be fully opened during operation.
Check whether the absolute inlet pressure is sufficient, so that no vapour can be
formed.
Check whether the pressure difference between suction and delivery pressure
corresponds with specifications for the duty point of the pump.

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 13 of 25
CP Series
Installation guidelines for pump piping

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 14 of 25
CP Series
Maintenance
Incorrectlayout
of suction pipe
Concentric
taper piece
Reduced
suction pipe
Short bend
Insufficient
space around
footvalve
Sufficient
space around
footvalve
Large bend
Increased
suction pipe
Eccentric
taper piece
Correct layout
of suction pipe
X
X
X
X
X

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 15 of 25
CP Series
Daily maintenance
Regularly check the outlet pressure.
Shaft sealing
Gland packing
Do not tighten the gland nuts any more after the running-in period and
adjustment.
If in time the gland packing starts to leak excessively, new gasket rings have
to be mounted instead of further tightening the gland nuts.
Mechanical seal
A mechanical seal generally requires no maintenance; however, it should
never be allowed to run dry. If there are no problems, it is not advisable to dismantle
the seal, as the facing surfaces are running in one another. Dismantling always
means replacement of the mechanical seal.
When the mechanical seal is leaking it has to be replaced.
Lubrication of the bearings
Grease-lubricated bearings
Bearing brackets with two grease-packed deep-groove ball-bearings require
no maintenance. a double-row angular contact ball bearing and a cylindrical bearing
requires re-greasing after every 1000 hours of operation. The bearings are filled with
grease during assembly. In case the pump is overhauled, the bearing house and the
bearings have to be cleaned and provided with new grease.
Oil-bath lubricated bearings
During operation the constant lever oiler should never be empty, so take care
to top up timely. The oil should be changed once a year. If the oil temperature is higher than
80’c, the oil should be changed more often.
Environmental influences
Regularly clean the filter in the suction pipe or the suction strainer at the
bottom of the suction pipe, as the inlet pressure may become too low if the
filter or the suction strainer is fouled.
If there is a risk that the pumped liquid expands during solidification or
freezing, the pump has to be drained and, if necessary, flushed after it has
been put out of service.

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 16 of 25
CP Series
Cause of failure
If the pump is out of service for a long time, it has to be preserved.
Faults
To determine the source of the malfunctioning of the pump, proceed as follows:
Switch off the current supply to the pump unit. Block the working switch with a lock or
remove the fuse. In case of a combustion engine: switch off the engine and close the
fuel supply to the engine.
Close the stop valve.
Determine the nature if the fault.
Try to determine the cause of the fault. (See Cause of failures) and take the
appropriate measures, OR
Contact your installer.
In general, failures in a pump unit are attributable to the following causes.
Failure in the pump
Failure or faults in the piping system.
Failure due to wrong installation or commissioning
Failure due to a wrong pump selection.
A number of the most frequently occurring failures as well as their possible causes
are set forth in the table below.
Trouble shooting
In case of abnormal operation or when the trouble occurs, the pump must be taken out of
service immediately. Inform all responsible personal, Prior to restarti`ng the pump the cause
of the problem must be determined and the problem to be solved.

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 17 of 25
CP Series
Fault finding chart
Most frequently occurring failure
Possible causes
Pump doesn’t delivers any liquid 1 2 3 4 5 6 7 8 9 10 11 12 14 17 19 20
21 29
The volume flow of the pump is
insufficient 1 2 3 4 5 6 7 8 9 10 11 12 14 15 17 19 20 21 28 29
The discharge head of the pump is
insufficient
2 4 5 13 14 17 19 28 29
Pump stalls after it has been put in to
operation
1 2 3 4 5 6 7 8 9 10 11
The power consumption of the pump is
higher than normal
12 15 16 17 18 22 23 24 25 26 27 32
34 38 39
The power consumption of the pump is
lower than normal
13 14 15 16 17 18 20 2128 29
The stuffing box is leaking excessively 6 7 13 25 26 30 31 32 33 43
Shaft packing or mechanical seal have
to be replace to often 6 7 23 25 26 30 32 33 34 35 36 41
Pump vibrates or makes noise 1 9 10 11 15 18 19 20 22 23 24 25 26
27 29 37 38 39 40
Bearings wear too soon or get hot 23 24 25 26 27 37 38 39 40 42
Pump runs with difficulty, gets hot or
stuck 23 24 25 26 27 34 37 38 39 40 42
Possible causes:
1. Pump or suction pipe not sufficiently filled or de-aerated
2. Gas or air coming from the liquid
3. Air lock in the suction pipe
4. Suction pipe leaks air
5. The pump sucks in air through the stuffing box
6. The sealing or flush-water pipe to the stuffing box is not connected or blocked.
7. The lantern ring in the stuffing box has been mounted wrongly.
8. The manometric suction head is too high.
9. Suction pipe or suction strainer is blocked.
10.Insufficient immersion of foot valve or suction pipe during operation of the pump.
11.NPSH available too low.
12.Speed too high.
13.Speed to low.
14.Wrong sense of rotation.
15.Pump doesn’t work at right duty point.
16.Liquid density differs from the calculated liquid density.
17.Liquid viscosity differs from the calculated liquid viscosity.
18.Pump works when the liquid flow is too low.
19.Wrong pump selection.

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 18 of 25
CP Series
20.Obstruction in impeller or pump casing.
21.Obstruction in the piping.
22.Wrong installation of the pump unit.
23.Pump and motor not well aligned.
24.Rotating part running out of true.
25.Imbalance in rotating parts(for instance impeller, coupling)
26.Pump shaft is running out of true.
27.Bearing faulty or worn out.
28.Seals rings faulty or worn out.
29.Damaged impeller.
30.Pump shaft or shaft sleeve at shaft packing or running surfaces of the mech. seal are
worn out.
31.Worn or dried up shaft packing.
32.Not well Packed stuffing box or bad mounting of the mech. seal.
33.Packing type of the mech. seal not suitable for the operation liquid or operation
circumstances.
34.Gland of seal cover has been tightened too much or crookedly.
35.No water cooling of stuffing box at high temperatures.
36.The sealing or flushing liquid to the stuffing box or the mech. seal is polluted.
37.Axial retaining of impeller or pump shaft is defective.
38.The bearing has been mounted wrongly.
39.Too much or too little bearing lubrication.
40.Wrong or polluted lubricant.
41.Impurities in the liquid get into stuffing box.
42.Too high axial force because worn dorsal blades or excessive inlet pressure.
43.Excessive pressure in packing space due to much play in the smothering bush,
blocked by pass pipe or worn dorsal blades.
IF SYMPTOMS PERSIST THE PUMP MUST BE TAKEN OUT OF SERVICE
IMMEDIATELY and Contact us or our appointed agents.

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 19 of 25
CP Series
Technical data
Lubrication
Oil Recommended oils according to ISO VG 68 classification for ambient temperature
above 15de.c:
BP -HLP 68
Chevron -EP industrial Oil 68
Esso -Teresso 68
Shell -Tellus 68
Mobile -mobile D.T.E.Oil Heavy Medium
Oil contents
Bearing bracket
Contents (mini.quantity)
0 300ml
0+ 300ml
1
400 ml.
2 500 ml.
3 600 ml.
Grease
Recommended greases according to NLGI-2 classification
BP -Enerrease LS 2
Shell -Alvania R 2
Mobil -Mobilux EB 2
Chevron -Polyurea EP grease-2
Esso -Beacon 2
SKF -Alfalub LGMT 3

An ISO 9001:2008
Certified company
WEL
-
TECH EQUIPMENTS PVT.LTD
MFR.OF INDUSTRIAL CENTRIFUGAL PUMPS
Regd .Office & works : Plot No : 57/9 , Phase-1 , Nr.Kiran Industries ,G.I.D.C ,Vatva , Ahmedabad-382445, Gujarat , India
Phone : [phone] Email : [e-mail] , [e-mail]
Web : www.weltechpumps.com
_________________________________________________________________________________
Page 20 of 25
CP Series
Interchangeability chart of parts for “CP” series
Parts having same number in the same column and made of the same material are
interchangeable.
SERIES
“CP’
Casing
Wear ring
Gasket
-main
St. box
cover
Bearing
Housing
shaft
sleeve
Gp.+
G.P.ring
Bearing
cover
(front
-
rear)
Support
foot
Impeller
nut
25
-
125
-----
0+
0
0
0
0
0
0
0
0
25-160 ----- 01 01 01 01 0 0 0 2 0
3
2
-
200
-----
02
02
02
01
0
0
0
1
0
32-125 ----- 1 1 1 1 1 1 1 1 1
32-160 ----- 2 2 2 1 1 1 1 2 1
32-200 ------ 3 3 3 1 1 1 1 3 1
32-250 1 4 4 4 1 1 1 1 4 1
40
-
125
-----
1
1
1
1
1
1
1
1
1
40-160 ------ 2 2 2 1 1 1 1 2 1
40
-
200
------
3
3
3
1
1
1
1
3
1
40-250 ------ 4 4 4 1 1 1 1 4 1
40-315 2 5 7 7 2 2 2 2 5 2
50
-
125
-----
1
1
1
1
1
1
1
2
1
50-160 ----- 2 2 2 1 1 1 1 3 1
50
-
200
-----
3
3
3
1
1
1
1
3
1
50-250 ---- 4 4 4 1 1 1 1 4 1
50-315 3 5 7 7 2 2 2 2 6 2
65-125 ----- 1 1 1 1 1 1 1 3 1
65-160 ----- 2 2 2 1 1 1 1 3 1
65
-
200
-----
3
3
3
1
1
1
1
4
1
65-250 4 4 6 6 2 2 2 2 5 2
65
-
315
5
5
8
7
2
2
2
2
6
2
80-160 ----- 2 2 2 1 1 1 1 4 1
80-200 6 3 5 5 2 2 2 2 4 2
80-250 7 4 6 6 2 2 2 2 5 2
80-315 7 5 8 7 2 2 2 2 7 2
80
-
400
8
6
11
10
3
3
3
3
8
3
100-125 ----- 2 2 2 1 1 1 1 4 1
100
-
160
7
3
5
5
2
2
2
2
5
2
100-200 9 3 5 5 2 2 2 2 5 2
100-250 10 4 6 6 2 2 2 2 6 2
100-315 7 5 8 7 2 2 2 2 7 2
100-400 6 6 11 10 3 3 3 3 8 3