Such installations require extremely careful and precise attention to hot alignment procedures.
Refer to
4.5 Alignment - final on page 31
5.
On units handling corrosives, the piping can be arranged so that corrosives can be flushed from
pump prior to opening unit for service. See
Figure 14: Pump flushing on page 17
tion, valves l and 3 would be closed, 2 and 4 open. Prior to dismantling, close valves 2 and 4,
open l and 3. Introducing water at valve 3 will allow water to flush pump and drain at valve 1.
Figure 14: Pump flushing
2.7 Piping - suction
General
Properly installed suction piping is of extreme importance for trouble-free centrifugal pump operation.
1.
Use of elbows dose 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 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 suc-
tion 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.
2.7 Piping - suction
Model 3415 Installation, Operation, and Maintenance Manual
17
