I can’t see a valve at the end of each line being practical. Then you’d need a lift to drain them when you wanted to use it and these are >25K square foot systems, so many valves.
Scott Office: (763) 425-1001 x 2 Cell: (612) 759-5556 From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Jeff Normand Sent: Friday, March 30, 2018 5:07 PM To: sprinklerforum@lists.firesprinkler.org Subject: Re: PVC drain line I say it's fine if you have drain valves at the end of each line and transition to pvc after the valve. But that may be expensive. So I say pvc is ok after the drain valve. But is that practical? On Fri, Mar 30, 2018 at 4:59 PM, Scott Futrell <sco...@ffcdi.com<mailto: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<mailto:Sprinklerforum@lists.firesprinkler.org> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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