Pompetravaini TCTM, TCHM Assembly Instructions Manual

(Rev. 2.0_10-2010)

DISASSEMBLY & ASSEMBLY

INSTRUCTIONS

SINGLE STAGE

CENTRIFUGAL PUMPS

TCHM & TCTM

Disassembly & assembly instructions single stage centrifugal pumps series TCHM & TCTM

2

INTRODUCTION

These instructions are for the maintenance personnel for maintenance and/or repair of the indicated pump series.
Disassembly and assembly require expertise and k nowledge of the procedures, therefore the work m ust be carried out
by qualified personnel.
These instructions m ust be car efully read and understood in conjunc tion with the section drawings and tables contained
in the manual and enclosed, prior to attempt any work on the pumps.
For safety, installation and maintenance instructions consult the manual “INSTALLATION & OPERATING
INSTRUCTIONS FOR CENTRIFUGAL PUMPS” attached to the pump at time of shipment. Consult also any other
attached instructions for accessories and/or components included with the pumps such as mechanical seals, heat
exchangers, flushing systems, instrumentation, etc.
Before operating or working on the pump it is recommended to adopt safety precautions wearing safety attire (hat,
glasses, gloves, shoes, etc.) and have ready the necessary tools required for the work to be done.
Do not subject the pump of its components to sudden mechanical impacts and /or distortions.
Do not damage or scratch the sealing faces. Pay particular attention not to damage flat gaskets and O-Rings.
Careful not to leave foreign matters such as moults, screws, washers, rags, etc. in the pump.
When r equesting spare parts or technical information for the pum p, always quote the pump model number and serial
number which is printed on the pump nameplate: therefor e it is rec om m ended not to rem ove the pum p nam eplate or, in
case this action will be necessary, write the serial number on the pump (for example on the flange).
Should additional information be required, please do not hesitate to contact POMPETRAVAINI or the closest
representative. Should there be any difficulties in repairing the pump, it is recomm ended to send the pum p for repair to
POMPETRAVAINI or the local authorised representative.
Pump repairs and/or service carried out by customer or unauthorised personnel are not guaranteed by
POMPETRAVAINI or by its subsidiaries.
Note: Pump parts list identify all pump components by item number (VDMA) in connection with the sectional drawings.

All drawings are for reference purpose and not are certified for construction, however should additional
information be required, contact POMPETRAVAINI or its closest representative.

INDEX

1 - Steps to be followed prior to pump disassembly
2 - Disassembly and assembly

2.1 - Disassembly

2.2 - Assembly

3 - Spare parts
4 - Section drawings
5 - Nomenclature of pump parts
6 - Engineering tables

The liquids handled by the pumps and also their parts could be potentially dangerous for persons and
environment: provide their eventual disposal in conformity with the laws into force and a proper
environment management.

The present manual is not as signed for pumps subjected to the ATEX 94/9/CE directive. In case the
pump is ass igned in environm ents s ubjected to the applic ation AT EX 99/92/CE direc tive or in cas e the
pump is provided with a nameplate indicating the AT EX stamp, it str ictly forbidden proceed to start up
the pumps but necessary to consult POMPETRAVAINI for clarifications.
For pumps subjected to the ATEX 94/9/CE directive it is available a dedicated integrative manual.

In preparing this m anual, every possi ble effort has been m ade to help the custom er and operator with the proper installation and operati on of the
pump. Should you find errors, misunderstandings or dis crepancies please do not hesitate to bring them to our attention.

1 - STEPS TO BE FOLLOWED PRI OR TO PUMP DISASSEMBLY

Should pump repairs be required, it is recommended to acquire full familiarity of the procedures to be followed by
studying these instructions and the “Operating Manual for Centrifugal Pumps”.

FOLLOW T HE SAFETY INSTRUCTIONS LISTED UNDER CHAPTER 2 OF THE AFORE MENTIONED
OPERATING MANUAL.

Disassembly & assembly instructions single stage centrifugal pumps series TCHM & TCTM

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It is important to adhere to the following before working on the pump:

- use the appropriate steps to stop the pump

- close the isolating valves at suction and discharge piping

- wear the safety clothing (hard hat, safety glasses, gloves, safety booths, etc.)

- disconnect the electrical power to the motor and all the electrical instrumentation and, if necessar y, disconnect the
electrical cables

- if the pump is handling hot liquids, let it cool down to ambient temperature

- drain the pump casing through by removing the drain plugs, rinse the pump with neutral liquid, if required

- adopt all safety precautions when the pump handles hazardous liquids, pollutant or toxic; these liquids
as well as the liquid used for rinsing the pump must be collected and disposed of with the maximum caution
and always in compliance with the local safety regulations.

To remove the pump and the motor (if required) from the installation proceed as follows:

- remove the bolts on the suction and discharge flanges

- disconnect any flushing lines, accessories and/or instrumentation connected to the pump assembly

- remove the motor, if necessary, by removing the anchor bolts from the motor flange

- remove the pump by removing the bolts from the pump’s feet

- disconnect the pump from the installation with caution, do not damage any components

- refer to the “Operating manual for centrifugal pumps” for instructions on transporting the pump.

2 – DISASSEMBLY AND ASSEMBLY

2.1 – DISASSEMBLY

(Refer to sectional drawings fig. 1 and 2 of chapter 4).
To remove the im peller VDMA 230 from the pump c as ing VDMA 102 remove the nuts from the studs VDMA 902.2. Pumps
fitted with Vortex type impeller, series TCMT, remove spacer ring VDMA 110 from pump casing or casing cover VDMA 161.
Remove impeller nut VDMA 925, impeller VDMA 230 and impeller key VDMA 940.2 from shaft VDMA 210.
Measure (making a r ecord) the location f or seal locating ring VDMA 485, or mark its location on the s haft, then loosen the
set screw VDMA 904, remove the locating ring from the shaft and remove the seal rotating part VDMA 433.2.
In the event the mechanical seal is f ixed on the shaf t with its own set screws then the loc ating ring may not be in the pump
assembly.
Remove the nuts from studs VDMA 902.1, remove casing cover VDMA 161 from lantern flange VDMA 341.
Particular care should be given when rem oving the mechanical seal components from the pump, mechanical seals are
fragile and may easily get damaged when mishandled.
Remove the stationary mechanical seal face from the casing cover, replace if necessary.

For complete pump disassembly proceed as follows.
Remove bolts VDMA 901, r emove motor f rom lantern flange, remove snap ring VDMA 932.1 and shaft complete with snap
ring VDMA 932 and ball bearing VDMA 320.
Remove snap ring VDMA 932 and the ball bearing from the shaft.
Finally remove the radial seal ring VDMA 421 from bushing VDMA 542.

2.2 – ASSEMBLY

Proceed with visual and dimensional inspections of the components to be replaced (use only original parts from
Pompetravaini), check the parts for wear and tear (for critical dimensions see tab.1 and 2 on chapter 6).
When in doubt, contact Pompetravaini or the closest representative.
To replace the wear rings ( only for TCHM series) VDMA 502, it is necessary to remove the set scr ews VDMA 904 and
remove the wear rings with a gear puller or, if it is too difficult, machine them off with a lathe.
It is good practice to replace all gask ets even if they do not show any defects, replace also bearings and m echanic al seals
that have excessive play or grooved faces.
Thoroughly clean the parts with suitable cleaning products that are also compatible with the pump materials.
The bearings should be washed with a solvent or Diesel fuel, let them dry and then oil them. To f acilitate their installation
over the shaft it is required to pre-heat the bearings to about 80

0

C.
If there are no complications and the components are free from defects, wear or markings over the sealing areas, the pump
assembly can be done proceeding with the sequences in the reverse of the disassembly.
Assembly of the pump wear ring should be done without forc e to prevent damages. To help keeping the gaskets firm in
their respective sealing faces, it is suggested the use of compatible liquids such as oil or equivalent fluid.
Fig. 3 in chapter 6 lists recommended torque values for various screws and bolts in relation to their diameter.

ONLY FOR TCHM

Insert and press the wear ring VDMA 502.1 (if it is being r eplaced) in the pum p c asing VDMA 102, drill and tap between
the wear ring and pump casing then install set screw VDMA 904 to secure the wear ring.