I'm looking at a few projects that have fire pumps and above-ground cylindrical storage tanks for fire protection.
Some projects I have seen have recirculation after the fire pump discharge underground and back into the storage tank. Frustrated I can't find much on this in NFPA 22 or elsewhere.
Is this part of a means for freeze-protection, or to keep the water from getting stagnant, or for pump testing (in which case I guess it would have to branch off from the flow meter)?
Or is it likely engineer preference? Is it a military requirement?
Thanks in advance.
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