I’d be highly surprised if anyone could guarantee 100% circulation in the system to prevent freezing. I wouldn’t put my name on it.
But if presented with an unheated area I’d prefer to use Dry or preaction in lieu of heat tracing an entire wet system. That just doesn’t make sense. Craig L. Prahl Fire Protection Group Lead/SME CH2M 200 Verdae Blvd. Greenville, SC 29607 Direct - 864.920.7540 Fax - 864.920.7129 CH2MHILL Extension 77540 craig.pr...@ch2m.com From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Gary Stites Sent: Monday, August 07, 2017 1:41 PM To: sprinklerforum@lists.firesprinkler.org Subject: Re: Heating cable and 1" wrap. [EXTERNAL] I once saw a grid system (with no dead ends,drops etc.) that had a small circulation pump on it that would start pumping when the temperature reached freezing. Thus circulating water from the remote point of the system to the base of the riser. I thought it was an interesting solution (though probably not legal)! It was in an area that rarely reached freezing temps. Gary Stites RLH Fire Protection On Wed, Jun 14, 2017 at 11:52 AM, Jamie Seidl <jamie.se...@gmail.com<mailto:jamie.se...@gmail.com>> wrote: I've done a heat trace system on a full foam system, branch lines and all. it was the P.E. that required it due to the division 2 classification, and the owners insistence on not installing Div 2 heaters in the chemical storage room. we asked him to provided manufacture, and a letter from the local authority authorizing the use on branch lines. The local FM was fine with it, and we haven't seen any problems out of it. It was a smaller room, approximately 3,500 sqft. The insulation he specified was pretty thick 2" isosomething. Jamie _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org<mailto:Sprinklerforum@lists.firesprinkler.org> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org -- Gary Stites 805-769-GMAN RLH<http://www.rlhfp.com> WWW.K25.Rocks<http://WWW.K25.Rocks> Pandora Station<http://www.pandora.com/?sc=sh43464983213902734>
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