RE: centrifugal pump suction

From: <yoram>
Date: Sun Mar 20 2005 - 08:45:00 EST

Steve McKenzie <Mechproj@xtra.co.nz> wrote:

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=o81r6LVr1WQY8z-Zx4XAG98nTAqqUo9_PA-2wrsQQwHvnuuvvfrkj7iH13j7HiyR8AqOy8R2WYBLn-vYRENRrWDhj8cS3ag">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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how to avoid cavitation and over damage to the pump.

1.install the pump direct to the inlet pump of resorver (same hight if you
instal the pump lower air pocket produced)

1.1.gate valve in the suction side no butterfly or ball valve.

2.after the gate valve you put eccentric reducer or equal pipe sizeif the
suction size in the pump is the same in the resorvier.

3.install the pump and be carfel about the aligment.

4.conccentric reducer in the outlet .

5.check  valve (diagonal is recomendment)

6.air pocket release valve in the outlet of pump .

gabai yoram







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Received on Sun Mar 20 08:45:00 2005