We found some- actually quite a bit, of sodium silicate, in the FDC drop above the check valve (about 3" thick 4" diameter).
The FDC is located off the end of the feed main side of a gridded system. This is after doing a 100 head TI where we didn't see anything unusual from the branch piping. NFPA 25 Annex D.5 directs a flushing of the entire system. Am I correct? Jeff Bridges
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