If they aren't properly protected the bolts on the couplings will be the Achilles heel. The safe, long-term way would be to use proper underground pipe and fittings, in accordance with their listing.
Scott Futrell (763) 425-1001 Office (612) 759-5556 Cell -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Mark Sornsin Sent: Monday, July 30, 2012 6:00 PM To: [email protected] Subject: RE: Galvanized underground main Greg: NFPA 13 forbids steel pipe underground, with the exception of 'dry' FDC piping. In that case you are allowed to use galvanized. Don't recall all of the specifics (like if wrapping is required). But to your point the problem is corrosion - the galvanizing doesn't help much underground. However, I don't know why a properly wrapped pipe couldn't do just fine underground. Except that 'properly wrapped' may be too difficult to achieve...? There may be too much risk of an Achilles heel in the form of an unprotected surface somewhere along the run. So how about cut-grooved ductile iron instead? Mark A. Sornsin, PE| Fire Protection Engineer Ulteig Engineers, Inc.| Fargo, ND [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Gregory Lindholm Sent: Monday, July 30, 2012 3:10 PM To: SprinklerFORUM Subject: Galvanized underground main I think I have seen this before, but could not find it. We need to run a wet main underground from one building to another. They are about 15' apart. The main will be 7' deep to get below frost. We plan to run 3" galv. sch. 40 with galv. grooved fittings. There will only be 2 ell & 4 couplings underground, and plan to wrap it with what the plumber use to wrap underground. Is there anything wrong with this idea, either code or common sense? Greg Lindholm -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20120730/e7a4d52d/attachment.html> _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
