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:[email protected]. > 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]" <sprinklerforum@lists. > firesprinkler.org> > *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 > >
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