Aren't you supposed to replace with new heads if the old ones are unscrewed?
Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT www.fpdc.com On Feb 28, 2013, at 12:18 PM, Ron Greenman <[email protected]> wrote: > And perhaps you let it go since the change of heads is for remediation of > another problem, and so that that remediation does not cause another > problem. When talking about the changes in demand basis calcs the heads are > the same, only the numbers have been changed to be more conservative. As > good as it would be to update calcs and upgrade the system if necessary, > that might be an onerous requirement. reusing the old heads though is a > different matter as we've found that taking heads out and replacing often > causes damage to the heads from over-stressing. > > On Thu, Feb 28, 2013 at 8:54 AM, John O'Connor <[email protected]> wrote: > >> The facility was a high-rise residential occupancy, designed to NFPA-13. >> Heads were QR semi-recessed chrome pend, K=5.6, ½" orifice, 155°. We >> replaced with same, but used 286° for a week or two until remediation was >> complete. No design change at all, only downside to entire project would >> have been a short time delay to fuse temperature should a fire occur in the >> interim. >> John O'Connor >> >> -----Original Message----- >> From: [email protected] >> [mailto:[email protected]] On Behalf Of Cahill, >> Christopher >> Sent: Thursday, February 28, 2013 9:54 AM >> To: [email protected] >> Subject: RE: Bedbugs >> >> How do you replace heads based on a minimum density that no longer exists? >> Speaking of the residential heads before the 0.05 minimum of today? Sounds >> like a few nightmares having to re-calc and replace piping in some >> circumstances? >> >> Chris Cahill, PE* >> Senior Fire Protection Engineer, Aviation & Facilities Group Burns & >> McDonnell >> 8201 Norman Center Drive _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
