This is how I did it when we used welded outlets: Cut short pipe nipples or use plugs. Nipples are better, because they let air escape and zinc flow in when the pipes are dipped in the zinc-bath.
Before screwing the nipples in, apply a little bit of anti-seize compound on both threads of the outlets and the nipples. Anti-seize compound is a kind of grease that is used for trucks (somewhere in the brakes as far as I recall). It withstands high temperatures, although not upto the temperature of the melted zinc. Remove the nipples after galvanizing. Thanks to the anti-seize compound this can be done by a less hulky fitter than without the compound. Restore the thread of the outlet to original condition by a bolt die. Since most of the original thread is still there, the die doesn't wear much. Hot dip applied zinc even protects bare steel upto a few millimeters (1/8 to 1/6 inch) next to the galvanized part. If you need perfect protection: apply zinc-compound to the thread of the outlets and the pipes before screwing them together. If you find zinc-compound too labour-intensive: use zinc-spray. Frans Stoop TOS architecture & fire protection Netherlands <[email protected]> Tel. +31-24-324 0112 At 10:11 21-5-2010 -0500, you wrote: >The biggest fitter AND the biggest wrench. > >David Autry >Plans Examiner >Nebraska State Fire Marshal's Office >246 S. 14th Street >Lincoln, NE 68508 >402-471-9659 >402-471-3118 fax >www.sfm.ne.gov > >** Note new email address: [email protected] > >-----Original Message----- >From: [email protected] >[mailto:[email protected]] On Behalf Of Thom McMahon >Sent: Friday, May 21, 2010 10:00 AM >To: [email protected] >Subject: RE: Galv fittings? > >I was thinking of cut to length pieces and holes for MT's. > >So how big a wrench did it take to get the plugs out? > >Thom McMahon, SET >Firetech, Inc. >2560 Copper Ridge Dr >P.O. Box 882136 >Steamboat Springs, CO 80488 >Tel: 970-879-7952 >Fax: 970-879-7926 > >-----Original Message----- >From: [email protected] >[mailto:[email protected]] On Behalf Of Autry, David >Sent: Friday, May 21, 2010 9:00 AM >To: [email protected] >Subject: RE: Galv fittings? > >"or have the >galv. Applied after fab." > >This is what I did at a petroleum refinery in Texas. Fabricated black pipe >with welded outlets, then installed plugs in the outlets, then off to be >hot-dipped. The plugs were a major challenge to remove. > >David Autry >Plans Examiner >Nebraska State Fire Marshal's Office >246 S. 14th Street >Lincoln, NE 68508 >402-471-9659 >402-471-3118 fax >www.sfm.ne.gov > >** Note new email address: [email protected] > >-----Original Message----- >From: [email protected] >[mailto:[email protected]] On Behalf Of Thom McMahon >Sent: Friday, May 21, 2010 9:35 AM >To: [email protected] >Subject: RE: Galv fittings? > >This gets us back to the point of there really is no good way to have an >outlet in Galv. Pipe without exposing the raw steel to some extent. >Threaded, Mech tee, cut to length and roll groove or cut groove. To keep the >factory galv. Un-marred you've got to use full length pieces or have the >galv. Applied after fab. > >Thom McMahon, SET >Firetech, Inc. >2560 Copper Ridge Dr >P.O. Box 882136 >Steamboat Springs, CO 80488 >Tel: 970-879-7952 >Fax: 970-879-7926 > > >-----Original Message----- >From: [email protected] >[mailto:[email protected]] On Behalf Of George Church >Sent: Thursday, May 20, 2010 4:43 PM >To: [email protected] >Subject: RE: Galv fittings? > >That was in the spec and since our shop does welded outlets, I took it out. >Chris, surely you have "insta-galv" spray in your shop, too? > >From: [email protected] >[mailto:[email protected]] On Behalf Of Chris Cahill >Sent: Thursday, May 20, 2010 6:24 PM >To: [email protected] >Subject: RE: Galv fittings? > >So when you want galv pipe o you allow welded outlets? Noting the outlets >and weld aren't exactly galv even with a coat of paint. > >Chris Cahill, P.E. >Fire Protection Engineer >Sentry Fire Protection, Inc. > >763-658-4483 >763-658-4921 fax > >Email: [email protected] > >Mail: P.O. Box 69 > Waverly, MN 55390 > >Location: 4439 Hwy 12 SW > Waverly, MN 55390 > >-----Original Message----- >From: [email protected] >[mailto:[email protected]] On Behalf Of >[email protected] >Sent: Thursday, May 20, 2010 4:00 PM >To: [email protected] >Subject: Re: Galv fittings? > >Chris, >I understand your plight and even I don't require screwed galvanized >fittings. We all know how difficult it is to thread pipe into them. >However, why are they made? Is there really a market for them? Not to >mention that newly threaded pipe has threads exposed that are not >galvanized. The only place that I have seen these required is on cooling >towers. > >Thank You > >Rahe Loftin, P.E. >Region 7 - GSA >Office - 817-978-7299 >Fax - 817-978-8644 >Cell - 817-371-3102 > > "Chris Cahill" > <chr...@sentryfir To > emn.com> <[email protected]> > Sent by: cc > sprinklerforum-bo > un...@firesprinkl Subject > er.org Galv fittings? > > 05/20/2010 03:49 > PM > > Please respond to > sprinklerfo...@fi > resprinkler.org > >How often do you see galv fittings required on galv piping? Usually >ductile >or cast are permitted aren't they? Don't ask where just know your tax >dollars are being put to good use - NOT! SIPA in a 20k office building >with >galv required on both. We're not talking some secret agency or historic >where wet paper is an issue. Yes they have a smoke detector in each room. >I can't make this stuff up I'm just not that creative. > >Chris Cahill, P.E. >Fire Protection Engineer >Sentry Fire Protection, Inc. > >763-658-4483 >763-658-4921 fax > >Email: [email protected] > >Mail: P.O. Box 69 > Waverly, MN 55390 > >Location: 4439 Hwy 12 SW > Waverly, MN 55390 _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
