RE: centrifugal pump suction

From: <Steve>
Date: Sat Mar 19 2005 - 19:31:00 EST

Hi ebyc75
I would put the reducer at the pump suction and use the 2" bend upstream. The reducer will help even out the flow entering the impeller. Use the longest reducer you can find; one with a cone rather than a step profile..
If there is no chance or air or gas accumulating at the suction (i.e. well flooded suction) I would use a concentric reducer so that the centreline of the flow leaving the reducer is at the centreline of the impeller.
Don’t forget to check your NPSHA and NPSHR.

Cheers

Steve

-----Original Message-----

From: ebyc75 [mailto:ebyc75@yahoo.com] Sent: Sunday, March 20, 2005 2:44 AM
To: <a href="/group/PipingDesign/post?postID=E44ThABGrrkY6GKbwImnfHqSFL6Ybbc6eSnOywYkOJiIshKTQlg_uxk27pwXj24pPZ-K4T2uBsbaqojGgs6-QI_UBw">PipingDesign@yahoogroups.com</a> Subject: [PipingDesign] centrifugal pump suction

The inlet size of the pump is 1" and the suction line is 2" dia. Due to the space constrain can a long radius elbow be installed directly with the pump mating flange. If so should the eccentric reducer (2x1) should be before the elbow or in between the elbow and mating flange.

Thanks

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Version: 7.0.308 / Virus Database: 266.7.4 - Release Date: 3/18/2005 Received on Sat Mar 19 19:31:00 2005