I was backed into a corner a few years ago where I had to put a dry pipe feed main underground. We used galvanized sch 40 in polyethylene wrap. The civil engineer had to specify a manhole dug halfway to China for a drum drip. Luckily, the storm invert elevation in the area was more than halfway to China so it was feasible to put a floor drain in the bottom of the manhole.
I hated doing it, but the Architect refused to put a dry pipe valve house at curbside. This was at an airport, and somehow the valet parking shack, the guard shack, the shuttle bus shack, etc. were all architecturally OK. Go figure. Eric Shelton Hankins and Anderson, Inc. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Todd Williams - work Sent: Wednesday, April 18, 2007 10:04 AM To: [email protected] Subject: RE: Underground Dry Pipe Craig, How do you handle elbows or tees? I would think that in order to make that work, the outer pipe diameter would have to be significantly larger than the inner pipe, at best. Plus, you would have to cut the pipe lengths so that radii of curvature would have the same center point. It could get ugly. (or am I over-engineering again?) At 09:41 AM 4/18/2007, you wrote: >Why not run your galvanized within a ductile iron casing. There are >pipe inserts for suspending one pipe within another (double >containment). Then you have the DIP in contact with your soil, but the >galvanized is still your dry system piping. > > >Craig L. Prahl, CET >Fire Protection Group >Mechanical Department >CH2MHILL >Lockwood Greene >1500 International Drive >PO Box 491, Spartanburg, SC 29304-0491 >Direct - 864.599.4102 >Fax - 864.599.8439 >[EMAIL PROTECTED] >http://www.lg.com > > >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of Richard >Matsuda >Sent: Wednesday, April 18, 2007 9:30 AM >To: [email protected] >Subject: Re: Underground Dry Pipe > >what kind of pipe?...good question. >Okay, I'll stick my neck out...thinking outside of the box. > >CPVC is not listed for dry pipe use...but why? >(1) is this for just overhead piping where the water in pipe of a >wet-pipe system will help keep the pipe from failing during a fire? >(2) or is this because air and CPVC are not compatible? >(3) or because the air will leak out thru the CPVC? >(4) some other unknown reason? > >CPVC is listed for underground use...so why not use the CPVC if reason >(1) above is the only problem. I don't know why CPVC is not listed for >dry pipe systems, and I'm not the AHJ on this project...so I'm just >wondering out loud. > >rick matsuda, city of dallas, bldg insp dept > > >>> [EMAIL PROTECTED] 04/17/07 04:05PM >>> >I've got a outdoor amphitheatre that needs sprinkler protection. The >only option allowed to get from the controls (adjacent heated building) >to the arch on the amphitheatre is to go underground. We will be using >galvanized pipe for the dry system for the amphitheatre. > >The question is what pipe should I spec for the dry underground? Can >(should) I use galvanized? Do you sleeve it? Any other suggestions? > >Thanks, >Reed Roisum >Fire Protection Technician >Ulteig Engineers, Inc. >3350 38th Avenue South >Fargo, ND 58104-7079 > >_______________________________________________ >Sprinklerforum mailing list >[email protected] >http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > >To Unsubscribe, send an email >to:[EMAIL PROTECTED] >(Put the word unsubscribe in the subject field) >_______________________________________________ >Sprinklerforum mailing list >[email protected] >http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > >To Unsubscribe, send an email to:[EMAIL PROTECTED] >(Put the word unsubscribe in the subject field) Todd G. Williams, PE Fire Protection Design/Consulting Stonington, Connecticut 860-535-2080 www.fpdc.com _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
