"Chris" wrote in message
.. .

|
| Head is calculated on the pressure end of the pump. Question was by
| placing @3' od pipe and 2 elboes on the supply end of the pump 2x
input
| size will this affect pump performance.

I think I may be catching up. Let me get this straight. You have a
return pump. Is it in the sump, or external? Placing too small a
supply line on almost any pump can cause cavitation, which will tear
up a pump. Elbows add friction, increasing the chances of this.

I think we're just confused by the 'supply pump' term.


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