It's not just the ID of the sensing line piping, it's the potential to clog the 3/32" orifi. You could use SS tubing with swagelock couplings if they're easier to locate in an industrial construction setting- they're often used for control and hydraulic lines for machinery, if copper is difficult to find.
glc -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Gus Olson Sent: Sunday, July 15, 2007 12:19 PM To: [email protected] Subject: Re: Why brass, copper or stainless steel, in Pressure Sensing Lines? Aydin, I've heard of a case where Galv. pipe was used for the sensing lines for the fire pump as you are referring to with disastrous results. The galv. flaking inside broke off and clogged the mercoid pressure switch thus preventing the pump from operating. I would recommend you stick with the brass, copper or stainless steel as noted in the book. Regards, Gus Olson GoCad, LLC ----- Original Message ----- From: "Aydın ÖZKAYA" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, July 14, 2007 1:53 PM Subject: Why brass, copper or stainless steel, in Pressure Sensing Lines? Dear All, I wonder why, "brass, cooper or stainless steel" piping (but not galvanized steel for instance) is specified for pressure sensing line for Fire Pump Controls in NFPA 20 7-.5.2 & 9-5.2. What is the rationality behind the "brass, copper or stainless steel" limitation? _______________________________________________ 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)
