ESFR Pendent Allowed on 4-inch Sprinkler Pipe?

9/8/2022

Can a pendent ESFR sprinkler be installed directly on a welded outlet of a 4-inch branch pipe?

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11 Comments

Dan Wilder

9/8/2022 07:22:25 am

Yep, no issues as long as the deflector stays within its min/max distances.

Previous field installs have made this difficult in reality as the depth of the truss upper chord, angled webbing members, TBC & the ring hanger, the outlet, and the size of the pendent make an install very difficult without a lot of coordination.

Glenn Berger

9/8/2022 08:16:00 am

Dan nailed the issue. Location of the deflector with respect to the ceiling or roof as applicable.

Alex

9/8/2022 08:18:50 am

As Dan mentioned, no issues as long as you stay within the requirements outlined in NFPA 13 (2019) Chapter 14 Installation Requirements for Early Suppression Fast-Response Sprinklers.

Casey Milhorn

9/8/2022 08:44:54 am

As others have said, no issue other than deflector distance. We had a job many moons ago, where it made more sense to use 4" branch lines and ESFRs than a fire pump. Basically it was an existing building, with multiple lead-ins that were technically each coming off of a semi-public water main (one of those installed back before public vs private demarcation was really worried about). Long story short, 4" branches with ESFRs had to be used. Due to some sagging structure and wind bracing we had to really jam the pipe up tight to get the deflector distance correct. Not as bad as the old days of sch. 40 6" and 8", but it was a draining install for the guys in the field.

Jesse

9/8/2022 08:53:14 am

Yep. Just make sure the deflector is within the minimum and maximum distances required by its listing.

9/8/2022 08:55:42 am

Is this possibly a typo and you were asking about an Upright and not a Pendent? With an Upright your answer is no.
I feel like people just answer to get their name noticed... when you all answer the exact same thing, wasting readers time. Anyone agree? (rhetorical) Have a nice day all. LOL

Fernando

9/8/2022 09:33:10 am

Maybe

Jon Griffin

9/8/2022 09:15:03 am

"S",
I am so sorry that your time was wasted reading everybody's comments... LOL

The writer specifically stated Pendent, which can be a problem on any size Branch Line as a direct drop; since to accomplish the task one has to raise the Branch Line closer to the deck to maintain deflector spacing to the deck. It is a valid query.

And, why not have several responses that agree on a given point. Such response numbers offer veracity to the original response and offer credibility.

Apparently, you felt the need to be noticed yourself with your response. Sir, you were successful! I saw it.

Franck

9/9/2022 09:17:39 am

Fully agree

And yes, you can put pendent ESFR on a 4" pipe

;)

David Kendrick

9/8/2022 10:36:38 am

Well said.

This is an open forum to seek counsel from peers and authorities.

To the question a short arm over would add expense but perhaps gain the necessary distance to place the deflector and operating element within it's listing and the applicable standard.

Mike

9/8/2022 02:52:10 pm

Agreed

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ESFR Pendent Allowed on 4-inch Sprinkler Pipe?

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