Alternative Methods to Retrain Long Sprigs?

4/6/2022

Sprigs that are over 4-feet in length are required to be restrained under NFPA 13.

What options do we have to achieve this?

I'd like to hear some different methods used to do this to expand my own knowledge here. Different situations like construction type and if the structural members are above or below the sprig. Thanks so much.

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6 Comments

Alex

4/6/2022 07:14:37 am

Hi,

NPFA 13 (2013) A.9.3.6.6 states that restraining wire can be used.

When it comes down to how individual sprigs are restrained, that's harder to answer. This will depend greatly on your construction type and where the sprigs are located.

For example, are your sprigs located near trusses? What other structural elements do you have to tie into?

Alex

Pete H

4/6/2022 07:18:23 am

Taking a shot in the dark, so take with a grain of salt:

https://dps.alaska.gov/getmedia/d52d0f17-29e3-4647-af0e-063022d9d073/Sprig-Supporting-Sprinklers

That is a quick summary from 2009 that shows it clamped to a truss.

Any listed hanger for affixing vertical pipe should apply.

From the Cast Iron Soil Pipe & Fittings Handbook:

Vertical Piping:
Secure vertical piping at sufficiently close intervals to keep the pipe in alignment and to support the weight of the pipe and its contents. Support stacks at their bases and at sufficient floor intervals to meet the requirements of local codes. Approved metal clamps or hangers should be used for this purpose.
If vertical piping is to stand free of any support or if no structural element is available for support and stability during construction, secure the piping in its proper position by means of adequate stakes or braces fastened to the pipe.

-

If you're in a Seismic situation as well, seismic vertical supports would apply. Including cable.

Justin

4/6/2022 08:26:36 am

What we use out in field and have found to have the most and quickest for field installation no matter what building type might be, is rod with swivels and a 1" hanger. The swivel allows you to be at multiple angles. It's what we our guys use on all of our installs that need this. This way and cable allow you the flexibility as a designer so you don't have to hit building members perfectly for clamps. It gives the field guys flexibility as well if other trades may be close or in the way. Installers are already used to using swivels and rod. We also span unistrut between members and attach swivels and rod for the random times the building members are too low or something like that.

Brad K

4/6/2022 08:31:05 am

Several things we see for this solution. We have used tees in the sprig to arm over and support the sprig below adjacent structure. Unistrut and u-bolt if sprig exists between structure. Lateral sway bracing or 4-way bracing.

Manny Rios

4/6/2022 09:06:02 am

In our jurisdiction most if not all projects are a seismic zone that requires additional restraint. Taking into account the construction design wires, cables and or rods with swivel clamps have been the preferred products to use.

Dan Wilder

4/6/2022 11:44:54 am

Any time we've dealt with this:

1. ATR w/ swivels with the rod locked at the hanger (typically with a surge clip) in a wide "V" or opposite each other
2. Ceiling grid wire 4x wrapped at each end and installed opposite each other

Now, I'm not is a seismic zone but anytime I've been in one, we kept the sprigs below that 4' or did them on a T/Run/Cap or 90/run/cap.

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