When you have 25 or 30 seconds to bring the end heads up to operating pressure, the QRS isn't expensive- it's P R I C E L E S S
Let's face it, how else can you reliably trip a system in 3.5 seconds? There had to be a better way than the flying saucers that were shot after you trip test the original installation. And here it is. I'm still amazed how you can massage a system with the FTD calcs and even sleep well the night before trip testing a 1200+ gallon system. Quite a change from showing up with an accelerator, exhauster, 2nd DPV and 250' of 6" galv in case you don't hit yer 60 seconds. I don't miss those days a bit. glc -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tom Duross Sent: Wednesday, October 24, 2007 6:53 AM To: [email protected] Subject: RE: Supervisory Alarm - Low Air Have you seen what those are going for? Man! Tom Go Red Sox!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Good point- especially in the low tolerance Potter QRS, so ya don't lunch it ! glc -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tom Duross Sent: Wednesday, October 24, 2007 3:56 AM To: [email protected] Subject: RE: Supervisory Alarm - Low Air And a bleeder valve for testing/setting, like you would with any pressure switch monitoring (high-low not null, like PS-10's). I've had pretty good luck with the standard Ashcroft 1005 series 3-2-3 gauges, 0-80 w/retard. 5 year life cycle per #25. We've cut them into the main rather than at the dry pipe valve. Must the gauge be listed? I always thought so. Tom Just a word of caution regarding low differential DPV supervisory air or any critical low air alarm. Always use a calibrated test gauge to set the pressure switch. Trying to find 7 PSI on a the best gauge that $5.00 can buy will always be a challenge. At one time some of the valves came with gauges with 0-300 lb scales . . . a standard trim gauge. . . in my view not suitable for the application. A good gauge with a scale of 0-50 lb would be a worthwhile investment when dealing with such low pressures. Mike Cabral _______________________________________________ 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)
