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Fire Pump with high negative suction pressure and high ampere reading
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11/30/2015 at 12:58:40 PM GMT
Fire Pump with high negative suction pressure and high ampere reading

Hi Fellow Engineers

I have existing problem with the fire pump on-site, having a high suction pressure of -5 psi during flow test @150% flow (minimum of -3 psi as per NFPA 20) at the same time with high ampere reading above the service factor ampere of 353A. Fire pumps specs at 250HP, 1000 gpm & FLA @ 307A. 2 nos. Fire Tank with outlet at 6 inch. We suspect that this is the reason for the pressure and high amps. We change the first outlet to 8 inch but with same result and now changing the 2nd tank outlet. The routing of the suction pipe is in series connection at 8 inch and the suction nozzle is 5 inch. Please give a sensible solution to solve this issue.

Refer to attached photo for the pipe layout.

Thanks in advance


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