pipingdesign: Re: Re: pump spoolpiece

From: <geoff>
Date: Sun Sep 09 2001 - 19:20:00 EDT

YeEs I agree except where the when this elbow is in a plane at right angles to the pump shaft.

refer Hydraulic Institute Standards for Centrifugal, Rotary and Reciprocating Pumps. My copy is the 14th edition and the explanation is on page 141.

Paul Bowers <pbowers@pipingdesign.com> wrote:
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Side suction pumps DO "require" a 3D straight run though. No?

Good question for
<a href="/group/PipingDesign/post?postID=S2lV_PcnrWo8OUp1AfDeLUzZ1TZKcIIEkwKwfYVNb9dyyZMStAsb2r8zvYfJEUdDbA-Pe2qlNi0Ihy7OFNfN9GDX80PLOJ-n">centrifugal_pumps@yahoogroups.com</a>

Paul

> 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.

</tt>

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