Besides the obvious regarding 4" soft hose, the reason is because the fire code requires a minimum 20 PSI residual pressure. There are various reasons for this including equipment and failure mitigation (such as collapsing hose), pulling a vacuum or near vacuum in the mains, freaking out the backflow appliance, etc. A long-standing provision, 20 PSI.
Steve Leyton Protection Design & Consulting -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Fletcher, Ron Sent: Tuesday, July 08, 2008 3:50 PM To: [email protected] Subject: FD Pumper Suction Hose Does anyone have experience with 4" pumper truck suction hose of the soft variety? According to a City FPE Phoenix FD requires 20 psi (flowing) at private hydrants to avoid collapsing the soft suction hose. Sounds fishy to me but I have no way of knowing. I can understand not taking the city main below 20 psi but I don't see why a private fire main can't go below 20. Ron Fletcher Aero Automatic Phoenix, AZ _______________________________________________ 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)
