Modern design pumps particularly thise running at two
pole motor speed have nozzles several sizes smaller
than the suction line. To put a piece of pipe at the
suction of the pump only increases the frictyion loss.
This will reduce the NPSHa not improve it.
Suggest you get another advisor..
Some designers in our office advise that a suction
line should contain a +-
150mm straight pipe spoolpiece between the reducer and
the flange on the
pump. They reckon it reduces the chances of
cavitation. Any comments and/or
references would be greatly appreciated!
Regards
Bossie Boswell
</tt>
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