Had an old thought challenged and I think I have learned something. Situation:
High rise building with a fire pump. Churn plus static to provide 100 psi (discharge side of most demanding hose valve) on combined standpipe creates just over 200 psi on bottom floor. Instantly I think to use pressure regulating valve for the lower systems, feed lower systems before pump boost or run a secondary standpipe. Another estimator tells me that most sprinkler components are rated for well over 175. I didn't believe it but looking at several products from several manufacturers seems to prove him right. There were a few exceptions such as some sprinkler heads and hose valves but for the pipe, fittings, valves etc there was no problem. If the project was FM it would be tougher as most of the standard 5.6 heads were 250 UL but 175 FM. NFPA 13 2007 6.1.3 System components shall be rated for the maximum system working pressure to which they are exposed but shall not be rated at less than 175 psi for components installed above ground..." Am I missing something here or does over pressurization of the lower floor only require pressure reducing hose valves and not system prv's as long as the components are rated for more than the "... maximum system working pressure to which they are exposed..." which seems to be the case for the vast majority of components. [Description: LOGO_10] Rod DiBona Vice President Rapid Fire Protection office : (605)348-2342 fax : (605)348-0108 cell : (605)391-3553 www.rapidfireinc.com<http://www.rapidfireinc.com> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20120517/8f1261f3/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: image001.jpg Type: image/jpeg Size: 6561 bytes Desc: image001.jpg URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20120517/8f1261f3/attachment.jpg> _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
