Most backflow appliances are test pressure rated up to 350 PSI if I'm not mistaken. They all have a "case burst pressure" threshold and that's one of the things U.L. does in classifying them - try to blow 'em up.
Steve Leyton Protection Design & Consulting -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of IPA Sent: Thursday, May 29, 2008 3:03 PM To: sprinklerforum Subject: 200 psi test for components rated 175 I've got this question posed to me: Backflow preventor is rated at 175 (as are most of the fire sprinkler components) yet we are required to do a 200 psi test. Is the keyword here "working pressure" of 175 psi or am I missing something? thx, _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
