Installation
TT Twin-Screw Pump -
Installation, Operation & Maintenance Manual
39
Pump Piping
General piping requirements and checklist
Precautions
WARNING:
Risk of premature pump failure.
Casing deformation can result in misalignment and contact with rotating parts, causing
excess heat generation and sparks. Flange loads from the piping system, including those from
the thermal expansion of the piping, must not exceed the limits of the pump.
CAUTION:
The pump is not designed to be a pipe anchor. Never draw piping into place at the
flanged connections of the pump. This can impose dangerous strains on the unit and
misalignment between the pump and driver. Pipe strain adversely affects the operation of the
pump, which results in physical injury and damage to the equipment.
Flange loads from the piping system, including those from the thermal expansion of the piping,
must not exceed the limits of the pump. Casing deformation can result in contact with rotating
parts, which can result in excess heat generation, sparks, and premature failure.
NOTICE:
Never attempt to throttle the flow from the either the suction side or discharge side of a PD
pump. This action can result in decreased performance, unexpected heat generation, and
equipment damage.
Piping guidelines
Guidelines for pump piping are given in the Hydraulic Institute Standards 9.6.6 and 9.8.
These should be referred to when making any system design.
Checklist
Check
Explanation/comment
Checked
All major piping must be
supported independently of the
pump and properly aligned with
pump flanges.
See Alignment criteria for pump
flanges.
Piping strain on the pump may cause distortion
resulting in misalignment or vibration
Keep the suction and discharge
piping as short and direct as
possible.
The pump cannot overcome deficiencies in system
design such as long runs of suction piping, possibly
undersized and containing many elbows, valves, and
particularly high points that are above the pump suction.
In such cases, the pump runs increased risk of being
noisy and with higher vibration.
Long discharge piping runs with many fittings will
increase system losses and reduce overall efficiency.
Use long radius elbows to change direction wherever
possible.
Check that only the minimum
necessary fittings are used, and
the fittings used are a type that
minimizes losses.