NFPA 20 says that if the test header supply main is more than 15 feet from the fire pump, it must be increased one pipe size or hydraulically calculated based on 150 percent of the rated pump capacity.
What form does the hydraulic calculation take?
Are we trying to determine if the main can flow 150 percent of the pump rating without running out of pressure?
How low a pressure would be acceptable?
Is this a one time calculation to size the main or is this a calculation that must be performed during each annual fire pump test?
Thanks in advance.
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