How to Restrain Sidewall Sprinkler?

8/21/2019

In NFPA 13 under "Location of Hangers on Branch Lines", Section 9.2.3.6 (2016 Edition) states that "wall-mounted sidewall sprinklers shall be restrained to prevent movement."

This section does not relate to seismic restraint, and annex material clarifies as much.

How is this sidewall-restraint typically achieved?

Many sidewall sprinkler installations have an armover and a drop that goes down the wall before a reducing elbow serves the sprinkler in the wall, and I don't recall ever seeing a means to restrain the pipe (or sprinkler) for steel jobs.

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4 Comments

Mike

8/21/2019 10:09:19 am

If the drop isn't long enough to create enough torque, restrain the line with wire or fast clamp. There should be wall studs that could be used to fasten to or tek screws into corrugated decking.

Mike

8/21/2019 10:11:21 am

Could also use blocking in the stud channel and attach a pipe strap to the drop.

Anonymous

8/21/2019 10:20:47 am

Sometimes I'll list for the fitter some "split-ring" (Anvil 138R) hangers to attach to framing, or 1" CPVC "stand-off" hangers (one of the ones that is also listed for steel pipe in 1"). If any fitters are on-line here, I'd be interested in their input.

Jonathan

8/21/2019 10:47:49 am

Find a stud on the wall that fits your design coverage area and run the steel pipe 2 1/4 center of pipe off of the stud and we typically use Afcon/Anvil #514 offset hanger/No- Block within 6 inches from the reducing 90. This hanger can be used for CPVC, Copper and Steel.

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How to Restrain Sidewall Sprinkler?

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