Building The Trapeze Sizer (Week 2 of 3)
Thanks for those who have provided feedback thus far - here's the progress on the Trapeze Sizing Tool.
Also, quick note: today is the last day to get the custom mousepad with the Toolkit. If you're an all-access subscriber of the Toolkit (new today or prior), be sure to fill out your information to get a free one on the dashboard. Those will be sent out starting next week.
The tool was not allowing any entry when it initially posted but that's cleaned up now.
I've updated some hanger detailing, labels, and Unistrut sizing.
What else would be helpful to incorporate here? I plan to add some flexibility on structure types, include a graphic scale, and offer options for which trapeze to show (the default is Schedule 10 pipe).
Also, for contractors - what is your preferred method of attachment and hanging for the trapeze? A washer and nut would typically be used for Unistrut and angle iron, but what about pipe as a trapeze? I'd like to detail what is realistic and preferred in the field.
As always, feel free topost comments here or shoot me an email with ideas. Thanks in advance!
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10/31/2018 12:23:44 pm
Forgive me if I missed earlier discussion on this, but one thing I have found designers and installers not to be current on, is that per paragraph 220.127.116.11.5 of recent editions of NFPA 13 (I believe revised and clarified in the 2007 edition), all components of each hanger assembly that attach to a trapeze member shall be sized to support the suspended sprinkler pipe. However, per paragraph 18.104.22.168.6, the ring installed on a pipe trapeze shall also be manufactured to fit the size of the trapeze member. So, it is my belief (and supported by informal interpretations) that unless you are using rings specifically made for trapeze loads (available, but seldom utilized) suspending the ends of trapezes with rings, and certainly ring-to-ring support of the suspended load, is rarely acceptable. (I interpret the "suspended sprinkler pipe" as being the sprinkler pipe being supported, not the trapeze member.) This leaves rod, with flat washers and nuts, through holes in the trapeze member no larger than 1/16-inch greater than the diameter of the rod one of the few remaining acceptable methods. I welcome your opinion and possible disagreement regarding this.
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Joe Meyer, PE, is a Fire Protection Engineer out of St. Louis, Missouri who writes & develops resources for Fire Protection Professionals. See bio here: About