Once downstream of a labeled valve, fine. Upstream, and including valve, no. A gang drain, for example uses materials complying with normal NFPA 13 materials. I’m assuming valve at each branch line in order to get adequate flow.
Best. Bruce Verhei > On Mar 30, 2018, at 14:59, Scott Futrell <sco...@ffcdi.com> wrote: > > A Friday afternoon conundrum for the group. > > I have a client with corrosion issues in several wet, twenty year old, ESFR, > warehouse systems. These are center-fed systems. Yes, center-fed. So all of > the branchlines are dead ends. Corrosion scale and sludge is pushed into the > ends of the lines. Flushing will be done. End of the day though the client > wants to add a tie-in drain line connecting all the ends of all the lines to > drain/flush in the future. It has been suggested that schedule 40 PVC might > be used for these tie-in drains. > > My response so far: > > Practically, plastic should be okay. > > But, it would not be recognized in NFPA 13. Also, because it could fail in a > fire, and we would expect high challenge fires in warehouses filled with > combustibles like pallets and plastics, if it failed before the sprinklers > operated, or before they were winning the battle you would have a potential > system failure. Chances are probably remote, but they would exist with the > right (wrong) conditions. > > I would expect that a knowledgeable inspector would question the installation > at least. > > I wouldn’t specify it, but schedule 40 PVC might be an option for what you > are trying to accomplish cost-effectively. > > What say ye all? > > Scott Futrell > Office: (763) 425-1001 x 2 > Cell: (612) 759-5556 > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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