News to me, laying one out for bid now where we are adding heads to maybe avoid the pump and tank. Existing building, top clg. probably 50' above street, 5/8" meter, 3/4 ug. Don't know static yet. A few extra heads will probably be cheaper than a pump.
Recall the base spacing in the original development was 12'x12' so your room as an example would have had 6 heads back in the day. The reduction in flow is a matter of density. Over the sq.ft. you are putting the same amount of water with the reduced spacing. It's wet stuff on the red stuff that puts a fire out. The EC needs more total water because more of it is going the wrong direction as compared to a regular coverage. Might even theoretically need more density because of the slight delay in fusing time of the head. I'd take any day less water but closer to the fire as better protection. Chris Cahill, P.E. Fire Protection Engineer Sentry Fire Protection, Inc. 763-658-4483 763-658-4921 fax Email: [email protected] Mail: P.O. Box 69 Waverly, MN 55390 Location: 4439 Hwy 12 SW Waverly, MN 55390 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Travis Mack, SET Sent: Thursday, June 18, 2009 2:51 PM To: [email protected] Subject: RE: 13D Question 1988 Edition Again, going from memory as well. Isn't / Wasn't there something saying that you need to use the fewest number of sprinklers able to protect the area. So, if you have a 20'x30' room, you need to use 2 sprinklers at 20'x20' spacing, instead of using 4 at 16'x16'. Using 2 sprinklers, you are calculating flowing 40 gallons for the 2 sprinklers vs 26 gallons for 2 sprinklers with 4 heads in the room, both scenarios protecting the same space. Is that possibly what he is referring to? -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Bob Knight Sent: Thursday, June 18, 2009 12:36 PM To: [email protected] Subject: RE: 13D Question 1988 Edition Mike, Going from memory, I don't have any standards with me, there is a requirement for QR sprinklers not exceeding 4. I believe that this is actually a 13R requirement though. Maybe this is the confussion. Bob Knight -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Mike Cabral Sent: Thursday, June 18, 2009 12:06 PM To: [email protected] Subject: 13D Question 1988 Edition I have an AHJ that is telling a designer that there can not be 4 sprinklers in a single compartment. I was told that he is working off an old standard from 1988 or so. Anyone have recollection of this. Mike Cabral _______________________________________________ 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) __________ NOD32 4168 (20090618) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com _______________________________________________ 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)
