To address Mike's concern about trip time, the QRS switch is pretty dependable- it samples the air pressure every .1 seconds and after enough degradation is detected 3x in a row, it trips. We input 3.5 second trip time even tho it would be a little less since it takes less than a .5 second to trip it, but :) maybe on one we'll need to make it 3.1 seconds so we gain .4 seconds in FDT. There have been days, eh Ken, when .4 seconds is the dif between making it or not making it.
I'd not rely on the sampling rate in my memory and look at Tyco's electronic acelerator data page, or Potter's QRS sheet. The 3.5 seconds is right. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ken Holsopple (forum) Sent: Wednesday, June 17, 2009 4:00 PM To: [email protected] Subject: RE: Slow responding dry pipe valves-FDT Chris wrote: >Let me clarify, I thought it was way too far off in the 1 example I was >involved with. 45 sec. calc after it repeatedly failed in the real world at >any place between 70 sec and 80 seconds. The contractor used it after the >fact when they failed the 60 second test on at least 3 occasions. Tyco did >the calc's not the contractor, I checked the input. This was not long >after >it was released. My mistake Chris....sorry to put words in your mouth. Was not my intent. Even since we have been using the software there have been several factors identified by Tyco that would cause delay in the real world. Such as delay in the start-up of fire pumps and large underground loops causing delay because of inertia. Ken Holsopple Designer Rowe Sprinkler Systems, Inc. _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
