TapFlo CTI AA-03 Operation instructions

CTI
CTH
CTI
CTH
With 2900 rpm motor:
With 2900 rpm motor:
With 1450 rpm motor:
With 1450 rpm motor:
CTI AA-03
CTH AA-03
CTI AA-024
CTH AA-024
CTI AA-05
CTH AA-05
CTI BB-054
CTH BB-054
CTI BB-07
CTH BB-07
CTI CC-114
CTH CC-114
CTI CC-15
CTH CC-15
CTI CE-114
CTH CE-114
CTI CC-22
CTH CC-22
CTI DD-224
CTH DD-224
CTI CE-15
CTH CE-15
CTI DF-224
CTH DF-224
CTI CE-22
CTH CE-22
CTI DG-224
CTH DG-224
CTI DD-40
CTH DD-40
CTI DF-40
CTH DF-40
CTI DG-40
CTH DG-40
CTI DF-60
CTH DF-60
CTI DG-60
CTH DG-60
CTI EF-55
CTH EF-55
CTI EG-55
CTH EG-55
CTI EF-75
CTH EF-75
CTI EG-75
CTH EG-75
CTI EG-110B
CTH EG-110B
CTI & CTH
Centrifugal Pumps
edition 2018 rev 2
Original instruction
Read this instruction manual carefully,
before you install and operate the pump.

CONTENTS
IOM manual CTI & CTH centrifugal pumps 2
0. GENERAL..................................................................................................................................... 6
0.1. Introduction................................................................................................................................ 6
0.2. Warning symbols ....................................................................................................................... 6
0.3. Qualification and training of personnel................................................................................... 6
1. INSTALLATION ................................................................................................................................... 7
1.1. Operation principle.................................................................................................................... 7
1.2. Receiving inspection.................................................................................................................. 7
1.3. Storage........................................................................................................................................ 7
1.4. Foundation ................................................................................................................................. 7
1.5. Environment ............................................................................................................................... 8
1.6. Suction and discharge piping ................................................................................................... 8
1.6.1. Connection of discharge pipe ........................................................................................... 8
1.6.2. Connection of suction pipe ............................................................................................... 8
1.7. Health and safety ....................................................................................................................... 9
1.7.1. Protection ........................................................................................................................... 9
1.7.2. Electrical safety .................................................................................................................. 9
1.7.3. Chemical hazard ................................................................................................................. 9
1.7.4. Dry running ........................................................................................................................ 9
1.7.5. Noise level .......................................................................................................................... 9
1.7.6. Temperature hazards......................................................................................................... 9
1.7.7. Rotating parts................................................................................................................... 10
1.7.8. Cleaning and disinfection................................................................................................ 10
1.8. Example of installation............................................................................................................ 10
1.9. Instruments............................................................................................................................... 11
1.9.1. Electric power ................................................................................................................... 11
1.9.2. Optional instruments....................................................................................................... 11
1.9.3. Thermometer.................................................................................................................... 11
1.10. Motor connection .................................................................................................................... 11
1.11. Motor standard ........................................................................................................................ 12
2. OPERATION ...................................................................................................................................... 13
2.1. Start-up..................................................................................................................................... 13
2.1.1. Starting the pump............................................................................................................ 13
2.1.2. Restarting after power shut-off...................................................................................... 13
2.2. Stopping the pump.................................................................................................................. 14
2.3. Cleaning and disinfection........................................................................................................ 14

CONTENTS
IOM manual CTI & CTH centrifugal pumps 3
2.3.1. Cleaning procedure.......................................................................................................... 14
2.4. Residual risks............................................................................................................................ 15
2.5. Disposal after expiration of the expected lifetime ............................................................... 15
2.6. Waste of electrical and electronic equipment (WEEE) directive .......................................... 15
2.7. Actions in emergency .............................................................................................................. 15
3. MAINTENANCE ................................................................................................................................ 16
3.1. Inspections................................................................................................................................ 16
3.2. Location of faults ..................................................................................................................... 16
3.3. Disassembly of the pump........................................................................................................ 17
3.3.1. Disassembly procedure.................................................................................................... 17
3.4. Assembly of the pump............................................................................................................. 19
3.4.1. Test run ............................................................................................................................. 23
3.5. Disassembly –4FZ option........................................................................................................ 23
3.6. Assembly –4FZ option ............................................................................................................ 26
3.6.1. Test run ............................................................................................................................. 26
4. OPTIONS ................................................................................................................................... 27
4.1. Lubricated seal –4Z ................................................................................................................. 27
4.2. Flushed seal –4F (API Plan 11) ............................................................................................... 29
4.3. Heating / cooling jacket –4J................................................................................................... 30
4.4. Hygienic shroud –M................................................................................................................ 30
4.5. Pump drain –4K....................................................................................................................... 31
4.6. Long coupled execution –B .................................................................................................... 31
4.7. Semi-open impeller –4H; Reinforced impeller –4W............................................................ 32
4.8. Reinforced pump casing –4B ................................................................................................. 33
4.9. Increased number of mounting holes –4O ........................................................................... 33
4.10. External quench –4Q............................................................................................................... 34
4.11. Mechanical seal options .......................................................................................................... 34
5. SPARE PARTS.................................................................................................................................... 35
5.1. Spare parts drawing................................................................................................................. 35
5.2. Spare parts list.......................................................................................................................... 35
5.3. Spare parts drawing - options ................................................................................................ 36
5.4. Spare parts list - options ......................................................................................................... 37
5.5. Spare parts –long coupled execution .................................................................................... 38
5.6. Spare parts list –long coupled execution.............................................................................. 38
5.7. Recommended spare parts...................................................................................................... 39
5.8. How to order parts................................................................................................................... 39

CONTENTS
IOM manual CTI & CTH centrifugal pumps 4
6. DATA ................................................................................................................................................. 40
6.1. Pump code................................................................................................................................ 40
6.2. Dimensions - CTI ...................................................................................................................... 41
6.3. Dimensions - CTH..................................................................................................................... 42
6.4. Dimensions –CTI long coupled pump ................................................................................... 43
6.5. Materials, data and limits........................................................................................................ 44
6.6. Mounting torques and dimensions of screws/nuts .............................................................. 44
6.7. Performance curves ................................................................................................................. 45
6.8. Permitted loads on inlet and outlet ....................................................................................... 46
7. WARRANTY ...................................................................................................................................... 47
7.1. Returning parts ........................................................................................................................ 47
7.2. Warranty ................................................................................................................................... 47
7.3. Warranty form.......................................................................................................................... 49

www.tapflo.com
EC DECLARATION OF CONFORMITY 01/EC/CT/2016
Series:
CTI / CTH …
Serial numbers:
2016 - … (from 1604 - …)
Manufactured by:
Tapflo AB
Filaregatan 4
442 34 Kungälv, Sweden
This declaration of conformity is issued under the sole responsibility of the manufacturer.
Object of declaration: SINGLE STAGE VERTICAL CENTRIFUGAL PUMPS
The object of the declaration described above is in conformity with the relevant Union
harmonization legislation:
Directive 2006/42/EC of European Parliament and of the Council of 17 May 2006 on machinery,
amending Directive 95/16/EC;
Directive 2014/35/UE of the European Parliament and of the Council of 14 February 2014 on
harmonization of the laws of Member States relating to electrical equipment designed for use
within certain voltage limits;
Mr Michał Śmigiel is authorized to compile the technical file.
Tapflo Sp. z o.o.
ul. Czatkowska 4b
83-110 Tczew
Signed for and on behalf of Tapflo AB:
Håkan Ekstrand
Managing director
Tapflo AB, 16.04.2016

0. GENERAL
IOM manual CTI & CTH centrifugal pumps 6
0. GENERAL
0.1. Introduction
The CT pumps are open or semi open single stage centrifugal pumps. They are
manufactured in high finish and mechanical strong material stainless steel AISI 316L. The
pump range meets the demands from a variety of today’s industries.
The industrial series CTI is designed with glass blasted pump casing. A variety of connection
types, mechanical seal options and other executions are available to satisfy most type of
industrial duties.
The hygienic series CTH is supplied with electro polished pump casing and internals. This
series is specially dedicated for hygienic duties in food, beverage and pharmaceutical
industries, where clean- and drain-ability are important factors.
With proper attention to maintenance, CT pumps will give efficient and trouble free
operation. This instruction manual will familiarise operators with detailed information about
installing, operating and maintaining the pump.
0.2. Warning symbols
The following warning symbols are present in this instruction manual. This is what they say:
This symbol stands next to all safety instructions in this instruction manual
where danger to life and limb may occur. Observe these instructions and
proceed with utmost caution in these situations. Inform also other users of all
safety instructions. In addition to the instructions in this instruction manual, the
general safety and accident prevention regulations must be observed.
This signal stands at points in this instruction manual of particular importance
for compliance with regulations and directives, for correct work flow and for the
prevention of damage to and destruction of the pump.
This symbol signals possible danger caused by the presence of electric fields or
live wires.
0.3. Qualification and training of personnel
The personnel in charge of installation, operation and maintenance of the pumps we
produce must be qualified to carry out the operations described in this manual. Tapflo shall
not be held responsible for the training level of personnel and for the fact that they are not
fully aware of the contents of this manual.

1. INSTALLATION
IOM manual CTI & CTH centrifugal pumps 7
1. INSTALLATION
1.1. Operation principle
In order to operate the pump, the casing has to be filled with liquid before start-up. The
liquid enters the pump casing axially to the shaft. The rotating impeller generates a
centrifugal force accelerating the liquid through the pump casing and into the discharge
piping.
1.2. Receiving inspection
Although precaution is taken by us when packing and shipping, we urge you to carefully
check the shipment on receipt. Make sure that all parts and accessories listed on the packing
list are accounted for. Immediately report any damage or shortage to the transport company
and to us.
1.3. Storage
If the equipment is to be stored prior to installation, place it in a clean location. Do not
remove the protective covers from the suction and discharge which have been fastened to
keep pump internals free of debris. Clean the pump thoroughly before installation.
When in storage, turn the shaft by hand at least twice per week. The pump-motor unit should
always be stored indoor in dry, vibration and dust free conditions.
1.4. Foundation
The pump-motor unit must stand on and be fixed to a sufficiently rigid structure that can
support the entire perimeter on which the unit stands. The foundation on a firm bottom is
the most satisfactory. Once the pump is in position, adjust level with metal shims between
the feet and the surface on which it stands. Check that the feet of the pump motor unit stand
well on each of them. The surface on which the foundation stands must be flat and
horizontal. If the unit is fitted on a steel structure, make sure that it is supported so that the
feet do not warp. In any case, it is advisable to fit some anti-vibration rubber pieces between
the pump and the brickwork. The motor needs an additional stand as its level is higher than
that of the pump casing. As an option the pump can be ordered with feet for the motor. For
close-coupled type, pump motor alignment is not required.

1. INSTALLATION
IOM manual CTI & CTH centrifugal pumps 8
1.5. Environment
There should be enough space in the vicinity of the pump in order to operate, maintain
and repair it.
The area in which the pump is operated, must be sufficiently ventilated. Excessive
temperature, humidity or dirt may affect the pump operation.
Behind the cooling fan of the motor there must be sufficient room for the hot air to
escape the motor.
1.6. Suction and discharge piping
A pump is generally part of a piping system that can include a number of components such
as valves, fittings, filters, expansion joints, instruments, etc. The way the piping is arranged
and the positioning of the components has a great influence on the operation and the
lifetime of the pump. The pump cannot be used as a support for the components connected
to it.
The flow of liquid from the pump must be as even as possible. It is advisable to avoid any
tight bends or drastic reductions of diameters that may cause flow resistance in the
installation. In case of diameter reduction, it is advisable to use appropriate conical
reductions (possibly eccentric on suction side and concentric on discharge side) at changes
of diameter and at a minimum distance from pump connections of five diameters.
1.6.1. Connection of discharge pipe
A check-valve and a shut-off/regulation valve are normally fitted on the discharge side.
The check-valve protects the pump from any backflow. The shut-off/regulation valve cuts off
the pump from the line and adjusts the output. Never adjust flow rate using the valve on the
suction pipe.
1.6.2. Connection of suction pipe
The suction piping is very important for the correct operation of the pump assembly. It must
be as short and as direct as possible. If a longer suction line is unavoidable, the diameter
should be large enough, i.e. at least as the inlet connection on the pump, to ensure less flow
resistance. In any case, suction must be carried out properly avoiding any air locks.
The CT pumps are single-stage centrifugal pumps, thus not self-priming. It will therefore
always be necessary to install a bottom valve in all cases when the static height of the liquid
is lower than the suction height of the pump. It is also crucial that the whole suction line is
filled with liquid prior to starting the pump. The suction piping must be air tight. Critical
points in these terms are also the seals between flanges and the seals of the valve stems.
Even some small air let into the suction line cause serious operating problems that can make
the pump stop. It is recommended to use check-valve in the suction line to avoid siphoning
when the pump stops.

1. INSTALLATION
IOM manual CTI & CTH centrifugal pumps 9
1.7. Health and safety
The pump must be installed according to local and national safety rules.
The pumps are constructed for particular applications. Do not use the pump on
applications different from that for which it was sold without consulting us to ascertain
its suitability.
1.7.1. Protection
In the interest of health and safety it is essential to wear protective clothing and safety
goggles when operating, and/or working in the vicinity of Tapflo pumps.
1.7.2. Electrical safety
Do not carry out any maintenance or/and operation on the pump while it is running or before
it has been disconnected from the power supply. Avoid any danger caused by electric power
(for details see current regulations in force). Check that electrical specifications on the data
plate are equivalent to the power supply to which it will be connected.
1.7.3. Chemical hazard
Whenever the pump is to be used for pumping a different liquid, it is essential to clean the
pump beforehand in order to avoid any possible reaction between the two products.
1.7.4. Dry running
Do not start nor carry out running tests before filling the pump with liquid. Always avoid dry
operation of the pump. Start the pump when it is completely filled and with the valve on the
discharge side almost completely closed.
1.7.5. Noise level
CT pumps, including the motor, in normal operating conditions produce a sound level below
80 dB(A). The major sources of noise are: liquid turbulence in the installation, cavitation or
any other abnormal operation that is independent from the pump construction nor the
pump manufacturer. The user must provide suitable protective means if the sources of noise
could produce a harmful noise level for operators and for the environment (in compliance
with current local regulations).
1.7.6. Temperature hazards
Raised temperature can cause damage on the pump and/or piping and may also be
hazardous for personnel in the vicinity of the pump/piping. The hot or cold parts of the
machine must be protected to avoid accidental contacts

1. INSTALLATION
IOM manual CTI & CTH centrifugal pumps 10
1.7.7. Rotating parts
Do not tamper with the protection of the rotating parts, do not touch or approach rotating
parts in movement.
1.7.8. Cleaning and disinfection
Cleaning and disinfection of the pump system is of greatest importance when the pump is
used in a food process installation. Use of a pump system that is NOT cleaned or disinfected
can cause contamination of the product.
1.8. Example of installation
1) YES: Gate valve (may also be near pump in case of long piping)
2) With positive head: tilt of piping towards pump
3) YES: line strainer if particles are present
4) NO: air pockets –the circuit must be short and straight
5) YES: pipe fastening
6) Suction line as short and direct as possible
7) YES: attachment for gauge or safety pressure switch
8) YES: adjusting gate valve on outlet
9) Bends placed after valves and instruments not closer to the pump inlet than five times the piping diameter
10) YES: attachment for gauge or safety pressure switch
11) NO: elbow joints (and other parts) on the pump (discharge and suction lines)
12) With negative suction lift: tilt of piping towards suction tank
13) YES: check valve (with negative suction lift)
14) YES: strainer if particles are present
15) Suction head varies according to flow in order to prevent windage
16) Suction head
17) Immersion depth
18) YES: expansion joint (indispensable with long pipes or hot liquids) and/or anti-vibration facility during
discharge and suction; anchored near to pump
19) YES: overcoming obstacles at lower depths
20) Fix the pump by the fixing holes provided: the supports must be level
21) YES: drainage channel around base

1. INSTALLATION
IOM manual CTI & CTH centrifugal pumps 11
1.9. Instruments
In order to ensure a proper control of the performance and the conditions of the installed
pump, we recommend using the following instruments:
- a pressure-vacuum gauge on the suction piping;
- a pressure gauge on the discharge piping.
The pressure intakes must be made of straight pieces of piping at a distance of minimum
five diameters from the pump inlets. The pressure gauge on discharge must always be fitted
between the pump and the shut-off / regulation valve. The output can be read on the
pressure gauge, transformed into meters and then compared with the typical curves.
1.9.1. Electric power
The electric power absorbed by the motor can be measured by means of a wattmeter or an
amp gauge.
1.9.2. Optional instruments
The optional instruments can indicate if pump is working in an abnormal way. The abnormal
conditions can be caused by: accidentally closed valves, lack of pumped liquid, overloads,
etc.
1.9.3. Thermometer
If the temperature of the pumped liquid is a critical parameter, provide the installation with
a thermometer (preferably on the suction side).
1.10. Motor connection
An expert electrician must always carry out the electrical connection. Compare the power
supply with the data plate specifications and then choose a suitable connection. The type of
connection is stated on the motor data plate and can be Y (star) or D (Delta), according to
the power supply of the motor (see figure below).
STAR
DELTA

1. INSTALLATION
IOM manual CTI & CTH centrifugal pumps 12
Follow the connection standard used in the plant. In no case connect the electrical motor
directly to supply network but use a suitable electric switchboard equipped with a knife
switch and suitable safety devices (e.g. motor breaker switches) in the power circuit. Safety
devices against overloads must also protect the motors. Make sure that the motor has
suitable grounding and that it has been connected properly.
1.11. Motor standard
As a standard Tapflo CT pump are equipped with motors of the following parameters:
International Mounting Arrangement –B34
Number of poles / Rotation speed [rpm] –2
Non ATEX
Protection grade –IP55
Voltage –3 phase
Motor power
RPM
Voltage
Frequency
0,37 kW
2900
Δ230 / Υ400
50 Hz
3500
Δ265 / Υ460
60 Hz
0,55 kW
2900
Δ230 / Υ400
50 Hz
3500
Δ265 / Υ460
60 Hz
0,75 kW
2900
Δ230 / Υ400
50 Hz
3500
Υ460
60 Hz
1,5 kW
2900
Δ230 / Υ400
50 Hz
3500
Δ265 / Υ460
60 Hz
2,2 kW
2900
Δ230 / Υ400
50 Hz
3500
Δ265 / Υ460
60 Hz
4,0 kW
2900
Δ400 / Υ690
50 Hz
3500
Δ460
60 Hz
5,5 kW
2900
Δ400 / Υ690
50 Hz
3500
Δ460
60 Hz
6,0 kW
2900
Δ400 / Υ690
50 Hz
7,5 kW
2900
Δ400 / Υ690
50 Hz
11 kW
2900
Δ400 / Υ690
50 Hz

2. OPERATION
IOM manual CTI & CTH centrifugal pumps 13
2. OPERATION
2.1. Start-up
Check manually that the motor is free to turn, moving the motor cooling fan.
Make sure that the piping is not clogged and is free from residues or foreign objects.
Make sure that the liquid flows regularly into the pump.
The pump and piping connected to it, at least the suction pipe, must be full of liquid.
Any air or gas must be carefully released. In case of suction with negative head, fill the
suction piping and check how the bottom valve works. It must guarantee that the liquid
must not flow back, emptying therefore the suction pipe with consequent disconnection
of the pump.
The suction shut-off valve (if any) must be completely open.
The shut-off / regulation valve on the discharge side must be completely closed.
The motor must turn in the same direction as the arrow shown on the pump. The
direction of rotation is always clockwise looking at the pump from the motor side; check
by starting briefly, then looking at the direction of rotation of the motor fan through the
fan lid. If it is wrong, the motor must be stopped immediately. Change the connection
to the terminals of the electric motor (chapter 1.10 “Motor connection”) and repeat the
procedure described above.
Any auxiliary connections must all be connected.
If the pump is equipped with an oil reservoir, make sure to fill it before start-up.
2.1.1. Starting the pump
Start the electric motor and open the discharge shut-off / regulation valve gradually until the
desired output has been reached. The pump must not run two or three minutes with closed
discharge. Longer operation in these conditions can seriously damage the pump.
If the pressure shown on the pressure gauge on the discharge piping does not increase, turn
off the pump immediately and release pressure carefully. Repeat the connection procedure.
If there are changes of flow rate, head, density, temperature or viscosity of the liquid, stop
the pump and get in touch with our technical service.
2.1.2. Restarting after power shut-off
In case of accidental stopping, make sure that the non-return valve has prevented backflow
and check that the motor cooling fan has stopped. Start the pump again following the
instructions of chapter 2.1.1 ”Starting the pump”.
If the pump intakes from a lower level than it is positioned, it can un-prime during the
standstill and therefore you must check again before starting that the pump and the suction
piping are full of liquid.

2. OPERATION
IOM manual CTI & CTH centrifugal pumps 14
2.2. Stopping the pump
It is advisable to close the discharge shut-off / regulation valve gradually and stop the motor
immediately after. The reverse sequence is not recommendable, especially with larger pumps
or longer delivery piping. That is to avoid any problems due to water hammering. If a suction
shutoff valve has been installed, it is advisable to close it completely after pump is fully
stopped.
2.3. Cleaning and disinfection
Cleaning and disinfection of the pump system is of greatest importance when the pump is
used in a food processing installation. Use of a pump system that is NOT cleaned or
disinfected can cause contamination of the product. The cleaning cycles as well as chemicals
to use for the cleaning vary depending on the pumped product and the process. The user is
responsible to establish a suitable cleaning and / or disinfection program according to local
and public health and safety regulations.
2.3.1. Cleaning procedure
The pump may be cleaned in two different ways:
CIP (Cleaning In Place)
without dismantling the pump, using steam, water or cleaning chemicals. Follow these safety
instructions during the CIP procedure:
Make sure that all cleaning line connections are properly tightened to avoid splashing
of hot water or cleaning chemicals.
When using an automatic process, a safety device should be installed to avoid
unintentional automatic start-up of the pump.
Before any disassembly of the pump, fittings or pipes, make sure that the cleaning cycle
is finished.
Manual cleaning
by simply dismantling the pump casing, impeller and mechanical seal. Always follow these
safety instructions:
Switch off the electric power to the motor and disconnect the motor starting system if
installed.
The cleaning personnel shall wear suitable protective clothing, footwear and goggles.
Use a suitable non-toxic and non-flammable cleaning solution.
Always keep the area around the pump clean and dry.
Never clean the pump by hand with pump running.

2. OPERATION
IOM manual CTI & CTH centrifugal pumps 15
2.4. Residual risks
Even with proper application and observance of all points listed in this operating manual,
there is still an estimable and unexpected residual risk when using the pumps. It may leak,
fail due to wear, application-related causes or system-related circumstances.
2.5. Disposal after expiration of the expected lifetime
The metallic components like aluminium, stainless steel and carbon steel can be recycled.
Plastic parts are not recyclable and must be disposed of as residual waste. The pump must
be disposed of properly, according to local regulations. It should be noted that potentially
dangerous fluid residues may remain in the pump and can create a hazard to the operator
or the environment, therefore the pump has to thoroughly cleaned before disposal.
2.6. Waste of electrical and electronic equipment (WEEE) directive
Users of electrical and electronic equipment (EEE) with the WEEE
marking per Annex IV of the WEEE Directive must not dispose of end of
life EEE as unsorted municipal waste, but use the collection framework
available to them for the return, recycle, recovery of WEEE and minimize
any potential effects of EEE on the environment and human health due
to the presence of hazardous substances. The WEEE marking applies
only to countries within the European Union (EU) and Norway. Appliances are labelled in
accordance with European Directive 2002/96/EC. Contact your local waste recovery agency
for a designated collection facility in your area.
2.7. Actions in emergency
In case of a leakage of an unknown fluid, respiratory protection should be worn and contact
with the fluid avoided. During firefighting, no special hazards are to be expected from the
pump itself. In addition, the currently handled fluid and the corresponding safety data sheet
must be taken into account.
In the event of personal injury, the appropriate emergency number or 112 must be chosen.

3. MAINTENANCE
IOM manual CTI & CTH centrifugal pumps 16
3. MAINTENANCE
Maintenance work on electrical installations must be performed by qualified
personnel and only when the power supply has been shutoff. Follow the local
and national safety regulations.
3.1. Inspections
Periodically check suction and discharge pressures.
Inspect the motor according to the instructions from the motor manufacturer.
In general, a mechanical seal does not require maintenance, but the pump should never
run when empty (dry). If a leakage occurs, replace the mechanical seal.
3.2. Location of faults
Overheating of motor
Insufficient flow rate or pressure in pump
No pressure on the discharge side
Irregular discharge flow / pressure
Noise and vibrations
The pump gets clogged
Overheating of the pump
Abnormal wear
Leak in mechanical seal
Possible reason
Solution
X
X
Wrong direction of rotation
Invert the direction of rotation
X
X
X
X
Insufficient suction head (NPSH)
Increase available NPSH:
Raise the suction reservoir
Lower the pump
Increase the pressure in the suction tank
Reduce the vapour pressure
Increase the diameter of the suction pipe
Make suction pipe short and direct
X
Pump is clogged
Clean the pump
X
X
X
X
Cavitation
Increase suction pressure
X
X
X
X
The pump sucks air
Make sure all connections are tight
X
X
X
Suction pipe is blocked
Check pipes / valves and filters on the suction line
X
X
Discharge pressure too high
Reduce the head by increasing pipe diameter and/or
reduce number of valves and bends
X
X
X
Flow rate too high
Reduce the flow:
Partially close the discharge valve
Reduce the impeller diameter (contact us)
Reduce the rotation speed
X
X
X
X
X
Liquid temperature too high
Cool the liquid
X
Broken or worn mechanical seal
Replace the seal
X
Wrong material of O-rings for the liquid
Mount O-rings in other material (contact us)
X
X
X
X
The impeller scratches
Reduce the temperature and / or suction pressure.
Adjust clearance between housing and impeller
X
X
Loads on the pipes
Connect the pipes independent of the pump
X
X
X
X
Foreign objects in the liquid
Use a filter on the suction side
X
Spring tension too low on mechanical seal
Adjust as mentioned in this manual
X
Shut-off valve closed on suction side
Check and open the valve
X
Discharge pressure too low
Increase the pressure –install an impeller with a bigger
diameter (contact us)
X
X
Pump is not filled with liquid
Fill pump with liquid
X
X
X
Liquid parameters different than calculated
Check pumped liquid parameters

3. MAINTENANCE
IOM manual CTI & CTH centrifugal pumps 17
3.3. Disassembly of the pump
The disassembly should be performed only by qualified personnel.
Each operation to be fulfilled with the machine must always be carried out once all the
electrical contacts have been disconnected. The pump-motor unit must be placed in a
position where it cannot be started unintentionally.
Before servicing in any way the parts that come in contact with the pumped liquid, make
sure that the pump has been fully emptied and washed. When draining the liquid, make
sure that there is no danger for people or the environment.
The numbers put in brackets, refer to the part numbers in the spare part drawings and spare
part lists in chapter 4“Spare parts”.
3.3.1. Disassembly procedure
Fig. 3.3.1
Unscrew the casing mounting screws [141] and
remove them with the nuts [143] and washers [142].
Fig. 3.3.2
Take off the pump casing [13].
Fig. 3.3.3
Remove the O-ring [18].
NOTE! After every disassembly the O-ring [18] has
to be replaced by a new one.
Fig. 3.3.4
Remove the impeller mounting screw [191] and the
washer [192], use a spanner key in the opening of the
pump back cover [11] to hold the shaft [16] during
assembly and disassembly of the impeller. Remove
the impeller.

3. MAINTENANCE
IOM manual CTI & CTH centrifugal pumps 18
Fig 3.3.5
Carefully remove the back casing [12]. The static part
[15B] of the mechanical seal will remain in the back
casing.
Fig 3.3.6
If necessary, push out the static part [15B] of the
mechanical seal.
NOTE! Apply some alcohol or water before pushing
out of the mechanical seal.
Fig 3.3.7
Remove the deflector [17].
Fig 3.3.8
Remove the screws [121] and washers [122]
fastening the back cover [11] to the motor [10].
Fig 3.3.9
Loosen the lock screws [161] and remove the shaft
extension [16].
The pump is now completely disassembled. Check all components, especially the mechanical
seal, for wear or damage and replace if necessary. The casing O-ring should be replaced
after every pump disassembly!

3. MAINTENANCE
IOM manual CTI & CTH centrifugal pumps 19
3.4. Assembly of the pump
The assembly procedure is done in the reverse order to the disassembly.
Nevertheless there are a few things that you have to remember in order to assemble the
pump correctly.
Fig. 3.4.1
Before inserting the static part [15B] of the
mechanical seal, fit the back casing [12] onto the
back cover [11] and check the seal fitting dimension
according to the table below. This ensures that
correct pressure is applied on the mechanical seal by
the impeller.
NOTE! This is a very important procedure when you
have taken off the shaft extension.
Fig. 3.4.2
Using a calliper, adjust the “S” dimension.
It is achievable by loosening the lock screws [161]
and moving the shaft extension [16] up or down.
Pump type
S [mm]
CT A
33
CT B
33
CT C
35.5
CT D
35.5
CT E
35.5

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IOM manual CTI & CTH centrifugal pumps 20
Fig. 3.4.3 –alternative way of assembly
„S” dimension can also be set by special Tapflo tool
[T]. Put the tool [T] onto the shaft extension [16] and
fix it with the screw [191], then lean the tool [T]
against internal rim of the back casing [12]. Using an
allen key fix the shaft [16] by tightening screws [161].
NOTE1! Pay attention to the application of the tool
[T]. There are 3 types of tools matching the following
pump sizes:
CT A, CT B
CT C, CT D, CT E
CT C, CT D, CT E with reinforced shaft
NOTE2! The inspection hole allows you to check
whether the face of the shaft [16] touches the tool.
NOTE3! After tightening screw [161] remember to
take off the mounting tool [T].
NOTE4! The set of special tools can be purchased
under Tapflo code 5-355-16MTS
Fig. 3.4.4
Precisely clean and degrease with alcohol the
internal rim of back casing [12]. Check if the rim
surface is smooth. If not it may be cause of
mechanical seal leakage.
NOTE! For cleaning use dust-free material e.g. blue
towel TORK 1230081.
Fig. 3.4.5
While unpacking pay attention to the application
(industrial / hygienic) of the mechanical seal [15].
Fig. 3.4.6
Lubricate the static part [15B] of mechanical seal to
provide more accurate assembly as well as prevent
the O-ring from blocking before reaching the surface
of the internal rim.