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Horizontal End Suction Pump for Chemical Process, ASME B73.1-2001
Installation, Operation, and Maintenance Manual – CPP21
5.1 PIPING THE SYSTEM
1. Check whether the piping is loosely laid, so that no strain is placed on the pump.
• Piping layout and installation shall provide adequate maintenance and
operation accessibility. Field installed auxiliary equipment shall not interfere
with removal of the machine or driver.
2. Remove the covers of the pump flanges.
3. Check whether the seals are correctly mounted.
4. Install a check valve and a gate valve in the discharge pipe. When the pump is stopped, the check valve will
protect the pump against excessive back-flow pressure and will prevent the pump from running backward.
• The check valve should be installed between the gate valve and discharge flange
in order to permit its inspection.
5. A spool piece should be installed in suction line so that the suction strainer may be installed and removed
with a pressure gauge between the strainer and pump.
6. The suction strainer should be installed between 5 to 20 pipe diameters upstream from the suction flange.
7. Cone type strainers (otherwise known as “witches –hat” strainers) should be mounted as recommended
within the Hydraulic Institute, that is with the cone pointing upstream away from the pump, into the
oncoming flow. As the strainer gradually gathers particles from the liquid and blocks up, this direction will
result in the lowest turbulence impact onto the liquid flow entering the pump.
8. Disconnect the piping from the pump if diamond heating the pipes is performed to align the pipe to the
pump.
9. Pump and pipe flanges must be parallel; they should mate together without effort, and with the bolt holes
properly in line
10. Check the fine alignment by clocking or using a Dial Type Indicator (DTI) on the coupling. Check the
operating instruction for the coupling.
11. Connect and tighten the suction pipe and compare the alignment with the values of the fine alignment. In
the case of deviations, warm the pipe so that the values of the fine alignment are reached.
• When heating takes place close to the flange, there is a danger that the flange
seal will become rippled and leaky. No more welding work can be carried out on
the piping when it is screwed to the pump.
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