Forum, *envision if you will...* Underground piping enters building - sprinkler point of connection is 'typically' @ 1'-0" a.f.f. at which we provide a gate valve - backflow assembly (or similar) - gate valve; then we proceed to our system. Next, envision a dual system - (1) wet and (1) dry... After the gate - a tee which branches off en route to the dry system... include a gate valve - dry pipe valve- piping to system. Off the tee outlet we go to the wet system... gate / b'fly valve - riser manifold - piping to system. Question: can this valve (whether a gate of b'fly) be omitted? I've seen it installed both ways - arguing that the gate on the discharge side of the B.F.P. and the Gate on the suction of the Dry can both be closed to isolate work on the Wet - if and when needed. I have been on both sides of the argument... dependent on the job / zones / etc... I've searched through NFPA 13 and cannot locate a specific code or installation practice that lays this to rest. Anybody else? Much Appreciation in advance. Chuck H. *go Twins* _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
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