Figure 13: Incorrect
3.
Do not connect piping to pump until grout has hardened and pump and driver hold-
down bolts have been tightened.
4.
It is suggested that expansion loops or joints, if used, be properly installed in suction
and/or discharge lines when handling liquids at elevated temperatures, so linear expan-
sion of piping will not draw pump out of alignment (Fig. 12 & 13).
5.
The piping should be arranged to allow pump flushing prior to removal of the unit on
services handling corrosive liquids.
6.
Carefully clean all pipe parts, valves and fittings, and pump branches prior to assembly.
3.6.2 Suction piping
WARNING:
NPSHA must always exceed NPSHR as shown on Goulds performance curves received with
order. Reference Hydraulic Institute for NPSH and pipe fraction values needed to evaluate suc-
tion piping.
Properly installed suction piping is a necessity for trouble-free pump operation. Suction piping should be
flushed before connection to the pump.
1.
Use of elbows close to the pump suction flange should be avoided. There should be a minimum
of two pipe diameters of straight pipe between the elbow and suction inlet. Where used, elbows
should be long radius (Fig. 14).
3.6 Piping
20
3196CC Installation, Operation and Maintenance Instructions
