I'm not sure your formula works for GPM. The capacity of the pump is
driven by the system demand. You may need to be looking at break tanks
based on your method. But, regardless, the system demand will drive the
pump capacity.
As far as pressure, for a max (when staying with 175 psi rated
components), I take (175 - static - elevation pressure differences) /
1.2 for an estimate of max pump pressures before I need to be looking at
higher rated components or pressure reducing devices.
The 1.2 is based on most pumps churning at 120%...you can be more
conservative and go with 1.4 since that is the max churn permitted by
NFPA 20.
Travis Mack, SET
MFP Design, LLC
2508 E Lodgepole Drive
Gilbert, AZ 85298
480-505-9271
fax: 866-430-6107
email:[email protected]
http://www.mfpdesign.com
https://www.facebook.com/pages/MFP-Design-LLC/92218417692
Send large files to us via: https://www.hightail.com/u/MFPDesign
LinkedIn: https://www.linkedin.com/in/travismack
On 5/18/2016 12:23 PM, Zachary Siegrist wrote:
Is there an equation to specify an appropriate pressure when sizing a
fire pump? For example, when sizing gpm, I've always taken the GPM
available at 20 psi divided by 1.5 to give me the maximum GPM rating
of the pump. I'm inquiring to see if such a formula is available to
size the pressure correctly. Can anyone help?
Zach Siegrist
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