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?
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