It could have been a factor determined from the average duty cycle of these small incremental HP air compressors. A lot of these small ones can not run constantly or for too long before the thermal overloads in the motor shuts them down. That's just speculation and I'm not sure you'll find the actual reasoning for the decision anywhere unless you find an old handbook with some commentary.
Craig L. Prahl, CET Fire Protection Specialist Mechanical Department CH2MHILL Lockwood Greene 1500 International Drive PO Box 491, Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 [email protected] http://www.ch2m.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Thom McMahon Sent: Friday, June 19, 2009 12:54 PM To: [email protected] Subject: RE: Air compressors No it was still there, but it doesn't apply does it? You wanted to know where the 30 min. came from right? The fact that certain types of systems are allowed 60 min. does not help you know where the 30 min. requirement came from. 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 Subject: RE: Air compressors Thom didn't mention the 60 minute statement in his earlier reply so it must have been removed between'72 and '74. Russell Rewis _______________________________________________ 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)
