I have a system with a 6” backflow preventer, which reduces to 4” immediately
after. There is approximately 48” of 4” pipe to the suction flange on a 4 x 3
pump. All elbows are turning correctly. Is this sufficient? Does the 10x rule
apply to the size of the backflow preventer or the fitting directly attaching
to the pump?
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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