Not taking listed vs. unlisted. They may be as good but the cheap versions are only listed to 100 psi. It doesn't take a lot of temperature change to exceed 100 psi. And in this case I have 115 static. And even if I had the more typical 50 psi the general requirement is everything on the system side of a sprinkler system must be listed to 175. If a compressor fails at any point including during a fire it's not a big deal. If one responds to the low air alarm nothing happens. If they ignore the low air alarm the system trips until the water gets to freezing conditions it will still put out a fire and doesn't break the piping causing water on the ground. An expansion tank fails and you have a big mess to report to your insurance company and if it's only listed to 100 psi you will be paying for the loss. If listed to 175 you have a fighting chance to avoid payment.
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 Greg McGahan Sent: Thursday, February 11, 2010 6:06 PM To: [email protected] Subject: RE: AF Expansion Tanks Everything I have looked at says that the "cheap" ones are as good as the listed ones. We have NEVER used a non-listed one outside of 13D but I certainly do think it is ridiculous that an air compressor does not have to be listed but an expansion chamber does? Greg -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Chris Cahill Sent: Thursday, February 11, 2010 2:30 PM To: [email protected] Subject: RE: AF Expansion Tanks 13 Chris -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Thom McMahon Sent: Thursday, February 11, 2010 2:05 PM To: [email protected] Subject: RE: AF Expansion Tanks 13 or 13D? Thom McMahon, SET Firetech, Inc. 2560 Copper Ridge Dr P.O. Box 882136 Steamboat Springs, CO 80488 Tel: 970-879-7952 Fax: 970-879-7926 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Chris Cahill Sent: Thursday, February 11, 2010 1:08 PM To: [email protected] Subject: AF Expansion Tanks Anyone got a source for correct ones that aren't so expensive. 100 psi 5 gal about $70 (plumbers version). 2.5 gal from Firetrol(?) or Youngs in the $600+ range. Is this what you've been doing on AF systems? My supplier tells me they sell a lot of the plumber's versions and almost none of the correct ones. And yet I don't hear of problems. Could be my hearing, could be no problems. 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 _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.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 [email protected] http://fireball.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 [email protected] http://fireball.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 [email protected] http://fireball.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 [email protected] http://fireball.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)
