Re: Parallel Pump Suctions

From: <Jacques>
Date: Tue Apr 12 2005 - 17:59:00 EDT

Yes, you got the idea. But do not add the NPSH, treat each pump separate. NPSHA is really an expression of how much pressure if available at the pump suction minus the vapor pressure.

Jacques
www.fluidedesign.com

• Original Message -----
  From: dornnalex
  To: <a href="/group/PipingDesign/post?postID=esU5Q-x9KrUqtztxiOPqn1Wm3GhjFSXWZHmp1iszqggDhWXOCvtVM_4mL5TIFOCtPIf9XkdBVQq3rn9sK97-Au3PTxk">PipingDesign@yahoogroups.com</a>
  Sent: Tuesday, April 12, 2005 4:26 PM
  Subject: [PipingDesign] Parallel Pump Suctions
  

How do you calculate the NPSH available when 2 pump are drawing from
the same suction line. I imagine I add the total flow of both pumps to
calculate the friction losses in the suction line. The absolute
pressure, vapour pressure and the static height remain the same.
NPSH avail = Habs - Hvpa +/- Hst - Hfs

Will this mean that the total "NPSH required" is just the sum of the
NPSH of each pump?

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[Non-text portions of this message have been removed] Received on Tue Apr 12 17:59:00 2005