It's very well possible. It all depends on the size and gauge of the structural member. More and more installations are using pre-engineered buildings which are typically of a light weight construction and not really designed for much static loading from the steel. Often you end up only having light weight "Z" or "C" purlins to hang from and if the structural design team didn't take into consideration your point loads, they have problems.
Typically hanging from the bottom is discouraged due to initiated bending stresses the load places on the structural member. Only your structural engineer can tell you what you can and can't hang to and what the maximum loading can be. Sometimes you may need to span more than two purlins to distribute the load. But again, check with the Structural EOR. Once you've got your layout complete give it to them to figure out how to support it. Supporting utilities is their problem. 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 Jay White Sent: Tuesday, July 14, 2009 3:16 PM To: [email protected] Subject: Trapeze hangers? We are installing a sprinkler system in a new warehouse. The structural engineer is saying that the point load for hanging with a top beam clamp is only 50 pounds max. Our grid main piping well exceeds this limit. Does this point load seem low? Can you hang a trapeze hanger from the bottom of a truss purlin? The truss purlin is not the same as a typical bar joist. Anyone run in to this problem? Jay White Estimator/Design Manager Dynamic Fire Protection 1807 Hwy. 25 South Starkville, MS 39759 Phone: 662-324-1550 Fax: 662-324-1545 Cell: 662-312-2426 _______________________________________________ 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)
