I am working on a pump house that has a 1500 gpm pump with an 8” suction line
(no reducer). There is an elbow in the suction line parallel to the pump shaft
with a piece of pipe that is 38” from the suction flange and there is a problem
with the test. We have to add another 42” from the parallel elbow to the
flange. There is physically not enough room in the pump house to make it in a
single straight run. My proposal is to turn the offending elbow looking up (so
no linger parallel), add a 42” vertical piece to an elbow and pipe that back to
the discharge from the backflow preventer. Can the 80” be split into 2 pieces?
NFPA 20 says nothing about that but I was wondering how it works in real life.
FYI, the backflow discharge is already over the 80” threshold.
Todd G Williams, PE
Fire Protection Design/Consulting
Stonington, CT
860-535-2080 (tel:860-535-2080) (ofc)
860-554-7054 (tel:860-554-7054) (fax)
860-608-4559 (tel:860-608-4559) (cell)
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