Let me follow-up on Pete's message. I'm the one that submitted that public input. I'm looking for guidance for the permitted slot sizes in angles based on the section modulus. I understand fabrication shops will slot angles for you from what I hear but I can't get my hands on the reference material for permitted slot sizes. Other contractors were forced (probably by the AHJ) to have these engineered by a structural engineer based on the loading of the pipe and backed with a very thick washer.
I'm not a structural engineer, but I know slotting angles will lessen it's structural integrity. How wide and long is too much? I want the approach to slotting angles for trapeze members to be correct. What is the reference guide for slots in structural steel? I found some online information - everything on the internet is true, correct? Tom On Aug 2, 2013, at 8:24 PM, Ben Young <[email protected]> wrote: > Why don't you just attach beam clamps to the angle iron in all three points > of attachment? > > Personally, I've always preferred pipe trapeze hangers since you always > have scraps of that laying around. Just make sure you put some beam clamps > on the ends of the trapeze member so it can't slip out for any reason. > > > Benjamin Young > > > On Fri, Aug 2, 2013 at 8:31 PM, Pete Schwab <[email protected]> wrote: > >> Group >> >> There is a PI (Public Input) to Hanging and Bracing in regards to trapeze >> hangers. I am trying to get some information in regards to how other >> contractors are doing trapeze hangers and whether there have been issues. >> We primarily use angle iron when installing trapeze hangers. In that angle >> iron we have slots cut to attach to the bar joists. This is because the >> joists are never "perfectly" installed and the joists can be "wavy". We >> install the trapeze member with ATR, nuts and washers supported through the >> slot. I have pasted the PI language below. Your opinions are welcome and >> will probably be used in the committee meeting. >> >> >> >> 9.1.1.7.7 >> >> Holes for bolts or rod shall not exceed 1⁄16 in. (1.6 mm) greater than the >> diameter of the bolt. >> >> >> >> Statement of Problem and Substantiation for Public Input >> >> The referenced term bolt also applies to all thread rod used commonly to >> support fire sprinkler >> >> piping. Slots in the trapeze member may weaken the member. Like fire to a >> structural member, >> >> the size of the slot permitted? - "it depends" due to the number of >> variables. The permitted slot >> >> size based upon the structural >> >> member has not been verified prior the submission date of this public >> input. >> >> >> >> Peter Schwab >> >> VP of Purchasing & Engineering Technologies >> >> >> >> Wayne Automatic Fire Sprinklers Inc. >> >> 222 Capitol Court >> >> Ocoee, Fl 34761 >> >> >> >> Mobile: (407) 468-8248 >> >> Direct: (407) 877-5570 >> >> Fax: (407) 656-8026 >> >> >> >> www.waynefire.com >> >> >> >> >> >> >> >> Celebrating over 34 years of life safety >> >> >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >> > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
