Isn't PEX used as the piping in heated floors where you would have a large change in temperature from winter (using it to halt the floor cum building, and summer where you wouldn't?
On Fri, Oct 7, 2016 at 6:31 AM, Steve Leyton <[email protected]> wrote: > I think an investigation of the potential for thermal expansion would be > prudent. The applications I described topped with 3-8 feet of earth, so > temperatures were stable year-round. But PEX is designed to expand and > contract without loss of structural integrity, so it's well suited for > embedment in concrete. > > > Steve > > > -------- Original message -------- > From: Ben Young <[email protected]> > Date: 10/7/16 6:27 AM (GMT-08:00) > To: [email protected] > Subject: Re: Monolithic domes > > I thought about PEX as well Steve, its no four letter word for me. At > least with the CPVC we can comply with the pipe requirements from NFPA 13, > which would require less 'selling' than PEX use. Although as Mark points > out about thermal expansion, PEX does have a lower rate of I think about an > inch per 100 feet. Because the concrete acts as a thermal sink and they > are insulated on the outside, I think the temperatures inside are > incredibly stable. The Wikipedia page for these things makes them sound > incredibly attractive for almost any building type, but there are some > drawbacks. > > > I'm just really surprised at the complete and utter lack of information on > sprinklering these except for the one I posted. > > > Benjamin Young > > On Thu, Oct 6, 2016 at 10:41 PM, Steve Leyton <[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]> >> Date: 10/6/16 7:23 PM (GMT-08:00) >> To: [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]> >> 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:sprinklerforum-bounces >> @lists.firesprinkler.org <[email protected]> >> ] *On Behalf Of *Maurice Marvi >> *Sent:* Thursday, October 06, 2016 12:58 PM >> *To:* [email protected] >> *Subject:* re: Monolithic domes >> >> Repairing buried CPVC branch lines sounds like fun. >> Not. >> >> >> Maurice Marvi >> ------------------------------ >> >> *From*: "Ben Young" <[email protected]> >> *Sent*: Thursday, October 06, 2016 3:18 PM >> *To*: "[email protected]" < >> [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] >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum- >> firesprinkler.org >> >> >> >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum- >> firesprinkler.org >> >> > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler. > org > > -- Ron Greenman 4110 Olson Dr., NW Gig Harbor, WA 98335 [email protected] 253.576.9700 The Universe is monstrously indifferent to the presence of man. -Werner Herzog, screenwriter, film director, author, actor and opera director (1942-)
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