How do you get a building built in 67 that needs a 50 year test in 4 years when it is already 51 years old. Maybe it’s just time to change the heads. Bill
Sent from my iPhone > On Sep 13, 2018, at 6:32 PM, Jamie Seidl <[email protected]> wrote: > > To me this sounds like classic Solder creep. The solder softens furring warm > conditions, and after many many (years) of hot days, you start to have heads > pop as the solder has finally given in to the pressure it has been holding > back. I think your correction on this would be glass bulb sprinklers. > Jamie Seidl > >> On Thu, Sep 13, 2018 at 5:20 PM Larry Block, Property Manager >> <[email protected]> wrote: >> Hi to all! >> >> >> >> I manage a number of most warehousing industrial parks around Los Angeles >> and only 1 of them has a problem with heads popping off for no apparent >> reason. We really need some help here in identifying the cause and its >> correction. Many have said to just replace them but who is to say that this >> will not happen again soon, if not later. The facts: >> >> >> >> 1. Concrete tilt up bldg from 1967 with its roof at 20’ H. >> >> 2. Heads are Reliable model C with the fusible link >> >> 3. Heads will get the 50 year UL testing in 4 years (though I assume the >> 165degF rating is not relevant here) >> >> 4. We have lost 7 heads over 15 years, with 3 in the last 4 months! >> >> 5. The link assemblies are never found but the remaining “rings” show no >> issues. The bronze seats >> >> of the head’s water port are always in perfect condition. >> >> 6. We see that the head’s “knuckle” that is opposite the fusible link is >> usually perfectly aligned, >> >> but a few of them are offset up to a 1/16” and it appears that >> when they move like that, >> >> they are rotating in an arc from the pivot points . >> >> 7. The water utility swears that at the time of these events, there are no >> pressure surges. >> >> 8. No more than one head has ever gone off at a time and are not just at one >> location or riser. >> >> 9. A nearby similar bldg of ours from 1968 with the same heads has never >> had one such event. >> >> >> >> We have entertained the possibility of water pressure, birds, electrolysis, >> dezincification, vibration and are at a loss. >> >> >> >> Any helpful thoughts? >> >> >> >> Thanks, >> >> >> >> Larry Block, Property Manager >> >> >> >> >> Virus-free. www.avast.com >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > > -- > \ \ > (o> -- If life were easy... > \ \_/ /) It'd be called your mom... > \_/_) > _|_ > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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