We have a project where the contractor tied in a new 4-inch standpipe into the existing 6-inch sprinkler main riser. Now it becomes a combination standpipe/fire sprinkler riser.
My question is - does the contractor still need to install riser isolation valves on every floor?
Per NFPA 13 18.104.22.168.2* the following restrictions shall apply:
(3) Each combined sprinkler and standpipe riser shall be equipped with a riser control valve to permit isolating a riser without interrupting the supply to other risers from the same source of supply. (For fire department connections serving standpipe and sprinkler systems, refer to Section 6.8).
As of now the sprinkler main riser is not a part of their scope. Thanks in advance.
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