Ron, I'm not familiar with fire dept operating procedures (you've gotten pretty good input from that perspective from others). Just a couple comments that have to do with simple hydraulics:
Due to friction loss, 20 psi at the supply hydrant will equate to something less than 20 psi at the pumper truck. If the pumper truck happens to be located higher than the supply hydrant, the elevation difference will decrease the 20 psi also. The 20 psi seems like a reasonable (though somewhat arbitrary) safety margin to prevent soft suction hose from collapsing. Ed Kramer Littleton, CO > 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)
