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Help On Pump Selection


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#1 surigaonon

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Posted 29 May 2011 - 09:28 AM

i have some queries regarding pump selection. i hope you guys can help.

Im currently working in a water feature company.here's the system i'm designing. there is a pool in the second level with a couple of fountain nozzles attached in a manifold pipe. the pump room is on the ground level. water suction comes from that pool and pump's discharge is connected to the nozzle manifold. the elevation difference is 4m and the tip of the nozzle above water level is 20mm.

--- my understanding is that my total static head is only 20mm since suction and discharge is from/to the same pool. ( am i right on this?)
--- assuming my total head loss is 2m ; that would give me 2.020mTDH ( my question is when i select a pump, should i based my TDH on 2.020m or i will need to add the elevation difference which would give me 6.020m)

--- what i did, i use the 6.020mTDH ( am i right on this?)

thank you very much in advance

#2 Art Montemayor

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Posted 29 May 2011 - 09:59 AM



Suriganon:

I think I can follow your description. But a simple schematic sketch, showing all of your piping and the lengths and heights should be much better for an accurate and engineering understanding.

Please furnish a sketch - preferably on an Excel spreadsheet - of the proposed installation. This will avoid a lot of questions and errors by our members. It also avoids language interpreations and mistakes in understandings.


#3 surigaonon

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Posted 02 June 2011 - 11:25 AM

Thank you sir for the reply. Attached is the system i am designing.

Attached Files



#4 fallah

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Posted 05 June 2011 - 01:21 PM

surigaonon:

It would be 2.02 m + V2/2g (velocity head)

V = Velocity of fluid exit from nozzle

No need to add 4 m elevation

#5 surigaonon

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Posted 06 June 2011 - 08:04 AM

fallah:

Sir thank you very much for the reply.




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