Regarding fire sprinkler system flushing of a wet-pipe gridded system; NFPA 13 Section 16.6.4 “All branch lines on gridded systems shall be arranged to facilitate flushing”.
We are doing a project which has more than 50 branches in a gridded system. Do all these branch lines need to be provided with a flushing capability? How is this commonly achieved? FM Global data sheets say to provide a small nipple between two flexible couplings, assuming removal of the nipple to flush the lines. Are there alternatives to this? Sent in anonymously for discussion. Discuss This | Submit Your Question | Subscribe
5 Comments
Mike
1/22/2021 09:08:07 am
I usually design tailbacks on grids and on those put a tee and plug, grooved add-a-cap, or grooved cap beyond the last head.
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CJ Bonczyk
1/22/2021 11:03:25 am
A future accepted proposal from NFPA Technical committee meeting will be removing this section from NFPA 13 due to its impracticality. This will be removed from the future edition.
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Fred Moore
3/22/2022 08:34:58 am
What if there was a sprinkler head adapter with a spring loaded valve that shuts off the flow when the head is removed. You would
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Dan Wilder
1/22/2021 11:29:10 am
Is the flushing due to known obstructions or just to comply with the "ability" to flush?
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Pete D.
1/22/2021 11:57:16 am
2 1/2" hose on the remote capped end of the float main for 15 minutes.
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