Can Trapeze Support Two Sprinkler Pipes?

8/2/2021

Is there anything in NFPA 13 that forbids multiple pipes (two, in this case) being supported by a single trapeze?

Assumption here would be that the trapeze has been accurately calculated to support the combined weight of the two pipes (per NFPA 13 Chapter 9, 2016 Edition).

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5 Comments

Mike

8/2/2021 08:20:41 am

Yes, it would be no different than hanging 2 pipes from the structure if it is adequately designed.

Jon Griffin

8/2/2021 08:27:50 am

Also, you only need to include a single instance of the 250-Lb. man-weight in your Trapeze calculation.

Dan Wilder

8/2/2021 08:30:49 am

I've done 4 in the past (increased the ATR and was using angle iron). Had to get structural sign off, put them well short of max spacing and placing them on Panel Points that were reinforced.

Just add up the section modulus accordingly.

CJ Bonczyk

8/2/2021 08:54:10 am

Yes, you can. You have to do the math using the modulus in the back of NFPA 13. Once that is completed it is advisable to send the calculations and information over to a structural engineer for the project. We have had very odd requests by the structural engineer of record in order to hang from the structural with multiple lines above.

Alex

8/5/2021 07:43:19 am

Hi Anonymous,

NFPA 13 (2013) 9.1.1.3.1.2 states that “sprinkler pipe and other distribution systems shall be permitted to be supported from a shared support structure design to support five times the weight of the water-filled sprinkler pipe plus 250 lbs, and one and one-half times the weight of all other supported distribution systems”.

Water filled pipe weight can be found in NFPA 13 Table A.9.3.5.9.

When working with hangers, I always consult a structural engineer. You may adequately design the hangers, but if the structure or another component can’t within stand your load, all the calculations are useless.

Best of luck with your design,
Alex

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Can Trapeze Support Two Sprinkler Pipes?

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