Is it acceptable to use a flexible coupling in a pump suction line that runs from a fire water storage tank to a pump house which sits on a separate foundation? We expect the tank to settle .65" initially and another 1.17" over 5 years and the pump house foundation is on piles so it will not settle. I seem to get conflicting answers when doing research. NFPA 20 shows using flexible couplings for strain relief, while other sites say to route my flexibility in the line. My opinion is that if NFPA 20 is ok with it, then I am ok with it. Unfortunately it is too late to make changes to the suction line, but will 2 flexible couplings in the straight run out of the tank be sufficient to handle the settlement? Any opinions would be greatly appreciated.
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