I think the statistic is 1:16m heads leak. Could be 13m. So yes, It's possible and has occurred often enough that there is a statistic. Usual culprit is fitters banging heads around in a bucket and the result might not show up for years.
On Tue, Dec 1, 2009 at 8:54 AM, <[email protected]> wrote: > Exactly. Bulb is intact. No chance of freezing. No chance of being hit. With > the rust it's been going on a while. Fitter didn't look at other heads. > We've not seen this much. Thought it was related to Central and o-rings > only. Has anyone else had experience with non-o-ring and non-Central heads > weeping and rusting? These are 25 yo Viking. > Sent from my Verizon Wireless BlackBerry > > -----Original Message----- > From: "Thom McMahon" <[email protected]> > Date: Tue, 1 Dec 2009 09:13:02 > To: <[email protected]> > Subject: RE: O-rings/leaking seat > > Just a comment, and I haven't been following this thread that closely, but > didn't you say green "Rust", which would indicate corrosion of the brass > seat to me. Just a thought. > > 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 David de > Vries > Sent: Monday, November 30, 2009 8:30 PM > To: [email protected] > Subject: Re: O-rings/leaking seat > > Chris: > > I believe Ron is right that Viking never made sprinklers with O-ring seals > in the waterway. When they started making glass bulb, QR sprinklers, they > went with the Belleville spring seal, which was the type of seal that > replaced the O-ring seal in the Central sprinklers. The oldest of their 8 > mm bulb sprinklers that I have on my desk is 1988 and it also has the BV > seal. > > Could your sprinkler have been exposed to freezing temps? I have seen > sprinklers with BV seals that were frozen, the seal displaced, and then > dribbled when the thaw happened. The seal is a thin piece of Mylar (or > generic equivalent, I believe) and it bulges out away from the spring. > > There are other mfrs that made O-ring sealed waterways. Go to UL's website > and look around, or contact me off forum. To my knowledge only Central and > a limited number of Gem and Star sprinklers were recalled due to O-ring > problems. > > Dave > > David A. de Vries, P.E., CSP > Firetech Engineering Incorporated > > > > > --- On Mon, 11/30/09, Chris Cahill <[email protected]> wrote: > > > From: Chris Cahill <[email protected]> > Subject: O-rings/leaking seat > To: [email protected] > Date: Monday, November 30, 2009, 11:20 AM > > > We've only been following the issue a little bit. I know about the recall > on Central heads so that's not the question. The question is - are there > other brands that are "rusting" and leaking from the seat? I've got a > Viking head from 1984 (might be a model XHH) that was leaking. It has a > flat cap much like the Central o-ring heads. It has a green "rust" line > around the seat. Is there other brands with o-ring, were they subject to > recall? Is the leaking caused by an o-ring, maybe I'm mixing two different > issues? > > > > 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) > _______________________________________________ > 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) > > _______________________________________________ > 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) > > _______________________________________________ > 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) > -- Ron Greenman Instructor Fire Protection Engineering Bates Technical College Tacoma, WA Member: SFPE, ASCET, NFPA, AFSA, NFSA AFAA, WSAFM _______________________________________________ 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)
