I would write the committee for an exception for tanks only but you might not make it. I think part of the reason for 3 year traditional measuring is also to verify the meter is accurate.
NFPA 20, 2013 edition requires an alternate means of measuring flow when a metering device is installed in a loop arrangement for fire pump flow testing. I assume (since it doesn’t say that you don’t have to) you still need the test header (alternative means) if your water supply is a water storage tank?? I understand the reasoning behind the alternative means if you have a city supply because you could pump water back to suction during your test with a meter and it doesn’t really test the water supply. With the meter arrangement you could potentially have a partially closed valve on the underground, but you wouldn’t necessarily know it. I didn’t look it up in 25, but I believe if you have a flowmeter arrangement you still have to flow water through the test header every 3 years. Just curious if there are multiple reasons for that requirement and if your supply is a tank, if it still makes sense to flow water at least every 3 years rather than just use a meter loop. Thank you. Reed Roisum
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