RE: Re: pump spoolpiece

reference: pump handbook by igor karrasik, page 10.24. here's what igor recommend regarding intakes and suction piping.

"... to provide optimum flow pattern to avoid impeller disturbance, it may be necessary to have a straight run of pipe of as much as 8 dimaters immediately prior to the pump suction (e.g. following a shirt radius elbow oe tee). Following a long radius elbow or in-line reducer, a straight run of at least 3 large suction dia is recommended...."

the arrangement is shown on fig.20. Igor has more to say regarding the used of eccentric reducer, plane of elbows, etc.. Note that it is a faily common practice to install a strainer (cone) at he pump inlet requiring at least a straight spool.

> ----------
> From: Isibankwa Tours[SMTP:avsb@mweb.co.za]
> Reply To: <a href="/group/PipingDesign/post?postID=ozpoH_JQumdgW4WR_o4AKXG_VxsfLD_7H-T0uvKoTiUmcTsodv8i4jGnBhhflRZ_e6iWigB2_h1HWtARkt4wKhT2zkbA3g">PipingDesign@yahoogroups.com</a>
> Sent: 03 September, 2001 8:39 PM
> To: <a href="/group/PipingDesign/post?postID=ozpoH_JQumdgW4WR_o4AKXG_VxsfLD_7H-T0uvKoTiUmcTsodv8i4jGnBhhflRZ_e6iWigB2_h1HWtARkt4wKhT2zkbA3g">PipingDesign@yahoogroups.com</a>
> Subject: [PipingDesign] Re: pump spoolpiece
>
> Could anyone clear this for me.
>
> 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
>
>
>
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Received on Tue Sep 04 02:11:00 2001