I have seen recently where the fine print on a load factor already included the 250 plus 5x. In my case your 300# would actually be 1750# yielding 300# useful for our intent. It wasn't what you are working on, just check the fine print or talk to the mfg. Of course at 300#/5#/ft = 60 ft which is 4x over designed if this is the case.
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 Todd Williams Sent: Monday, June 21, 2010 11:40 AM To: [email protected] Subject: Hanger capacity I am having to go through some calculations on hangers to see if a particular truss can handle the sprinkler pipe. The problem is involving Sammys and since they are not specifically listed in NFPA 13 (2002), we need to do the calculations. My question has to do with the swivel rings. Section 9.1.1.2 requires the 5x wt of water filled pipe + 250 lbs. According to the PHD Manufacturing literature I have, a 2" swivel ring has a design load is 300 lbs. If we deduct the 250, you have 50 lbs left. Divide that by 5 and you get 10 lbs as the maximum weight that can be supported. Since 2" water filled pipe weighs 5.17 lb/ft., the maximum span a 2" hanger can support and meet the NFPA 13 requirements is 1" - 11". Am I missing something here? Todd G. Williams, PE Fire Protection Design/Consulting Stonington, CT 860.535.2080 www.fpdc.com _______________________________________________ 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)
