Figure 14:
2.8 Piping - suction
General
Properly installed suction piping is of extreme importance for trouble-free centrifugal pump operation.
1.
Use of elbows close to the pump suction flange should be avoided. Where used, elbows should
be long radius.
On double suction pumps, if an elbow must be used at the pump suction flange, it must be in a
vertical position only. If an elbow must be used in other than a vertical position, it is permissible
only providing there is a minimum of two diameters of straight pipe between the elbow and pump
suction flange.
Figure 15:
2.
The suction pipe should never be of smaller diameter than the pump suction. Use of suction pipe
one or two sizes larger than the pump suction, with a reducer at the pump suction flange, is de-
sirable.
3.
Reducers, if used, should be eccentric and preferably at the pump suction flange, sloping side
down.
2.8 Piping - suction
18
3107 Installation, Operation and Maintenance Instructions
