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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 8.17.5.2.2* 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. Sent in anonymously for discussion. Discuss This | Submit Your Question | Subscribe
3 Comments
Glenn Berger
3/9/2021 09:19:22 am
Contractually - Do not know the details of the specific contract.
Casey Milhorn
3/9/2021 09:20:14 am
Might need a little clarification on this one. So the existing system consisted of a wet automatic sprinkler system only and another contractor came in and added a new 4" standpipe with hose valves? If so, then at least an isolation valve will be required at the base of that standpipe. But it sounds like you may be asking if each floor should be zoned by floor now with its own valve, flow switch, drain, etc..? If that is the question, I would say that is an AHJ call but my opinion would be not unless the total area of all floors are over 52,000 sqft, and even then it sounds like someone approved it at some point, which is why the AHJ should step in possibly. Was that the question being asked though? Thanks for any additional info.
Colin Lusher
3/9/2021 11:56:39 am
The riser isolation valves you're referencing are not required "per floor". These valves are only required at the base of the standpipe riser. These isolation valves are normally located just before the standpipe riser enters the stairwell and goes vertical. So If a building has two stairwells, with a standpipe riser in each stairwell, then you will need to have an isolation valve at the base of each stairwell standpipe riser. This will allow you to shutdown the standpipe in one stairwell without affecting the standpipe in the other stairwell. Leave a Reply. |
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