Hello Tom, Based on : >> 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.
MY opinion is that slots of any size more then 1/16" wider then the fastener are not allowed. We always field drill them to fit. Monday, August 5, 2013, 8:13:15 AM, you wrote: > 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 -- Best regards, Charles mailto:[email protected] _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
