One thing no one has mentioned on this thread concerning the installation of sprinkler pipe in cast in place concrete, is the differential rate of thermal expansion. While concrete and steel have very similar rates of thermal expansion, the rate of thermal expansion for pvc and cpvc is quite different. Cpvc pipe in any diameter has a thermal expansion rate of around 2 1/4" per 100 lineal feet at 50 degrees F temperature chance. I've not been able to read the information in the Monolithic Dome/Sprinkler report, also on a long weekend, but I would be curious to know how one would allow for this much movement in a long run of sprinkler pipe with sprinkler "drops" penetration the surface of the cast concrete every 10 to 15 feet!?
Mark at Aero 602 820-7894 Sent from my iPhone On Oct 6, 2016, at 7:41 PM, Steve Leyton <[email protected]<mailto:[email protected]>> wrote: Listed PEX A and I think the sprinklers were screwed right into the branch fittings because we only needed 30 minutes per UL 1821. If you really need the details, I have to look at my technical report and may not be able to do that for a couple days as I'm taking a long weekend. Wine caves are a little different than overhead domes because we ran a CPVC main down the corridors under the floor and branched off with 1" PEX that wrapped halfway around the vault serving a single sprinkler. The CPVC was directly buried and the floors were made of hand-laid stone on a sand bed. But I think you could drop to the sprinklers with CPVC or even use PEX because I'm not as worried about protecting piping that has a sprinkler between it and the heat source as I might be concerned about a piping span that's between sprinklers. Steve -------- Original message -------- From: AKS-Gmail-IMAP <[email protected]<mailto:[email protected]>> Date: 10/6/16 7:23 PM (GMT-08:00) To: [email protected]<mailto:[email protected]> Subject: Re: Monolithic domes If I may ask, was that PEX A or B and how were the last bit of drop piping handled where the sprinklers screwed in? Allan Seidel St. Louis, MO On Oct 6, 2016, at 3:32 PM, Steve Leyton <[email protected]<mailto:[email protected]>> wrote: It's a dirty word on this Forum to some, but I would consider looking into PEX tubing if you can get it to work hydraulically. The challenges with PEX are smaller ID and temp/pressure rating. However, PEX can easily be attached to the formwork for concrete or Gunnite and we have used it with great success in wine caves out here on the Left Side. Aggregate concrete has a fire resistance rating that can be extrapolated as about 22.2 minutes per inch and I've done tech reports for two wine cave applications where we obtained equivalency approval for this application. Steve Leyton From: Sprinklerforum [mailto:[email protected]] On Behalf Of Maurice Marvi Sent: Thursday, October 06, 2016 12:58 PM To: [email protected]<mailto:[email protected]> Subject: re: Monolithic domes Repairing buried CPVC branch lines sounds like fun. Not. Maurice Marvi ________________________________ From: "Ben Young" <[email protected]<mailto:[email protected]>> Sent: Thursday, October 06, 2016 3:18 PM To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: Monolithic domes Does anyone have any information at all about putting sprinklers in a concrete monolithic dome? I was able to find one article about it at the monolithic dome institute's website here: http://static.monolithic.com/construction/sprinklers/index.html Looks crazy, but also interesting. Benjamin Young _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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