When should sprinklers be installed on CPVC systems, before or after the drop is "glued" in place?
NFPA 13, 2016 Edition, Section 184.108.40.206 "Where solvent cement is used as the pipe and fittings bonding agent, sprinklers shall not be installed in the fittings prior to the fittings being cemented in place."
From my time in the trade; about 13 years I have always seen fitters "prepping" their CPVC sprinkler drops by "gluing" the sprinkler adapter on, then tightening the sprinkler into the adapter, and then sitting the drop vertically in a bucket with the sprinkler on the top.
They say that way if any glue runs down from the joint it just goes into the drop and not down in to the sprinkler itself.
That is easy enough, but what about the Tee or Elbow that the drop is going to be glued in place into?
Personally the way I did jobs while I was a foreman is we would pre make the drops, cut in a 1/2 to a whole floor and then run back through and install the sprinklers into the drops.
Personally I liked that because I only had the sprinklers on the job the day they were getting installed, no worries about getting stolen or damaged from being on site, and then no worry about glue getting into the sprinkler at all. Plus when we went around just putting sprinklers in it was extremely fast and no hold back wrench required. And it was literally just taking that process of removing the sprinkler from the box and tightening it in to a fitting and shifting it to a different day.
Plus I have personally pulled sprinklers out of CPVC systems where the head/button was filled solid with glue.
The way I read Section 220.127.116.11, I take it as all the fittings, not just the particular fitting that the head is installed in to.
But I definitely can see how it could be interpreted as only the fitting the head is installed in.
How do you other code followers see it?
Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
5/10/2023 08:26:58 am
Pre-gluing drops with sprinklers installed is a bad practice due to the potential for glue clogging the sprinkler orifice and contraindicated by the manufacturer’s installation manual. If our AHJ catches this happening, drops are required to be cut out and replaced, possibly with a witnessed internal drop inspection prior to sprinkler installation.
Attention to detail when gluing and installing sprinklers in a CPVC system is critical.
5/10/2023 09:56:41 am
The RC's upside down is only one part of the process as you indicate, the upper Tee or Ell and the potential interior glue lines running down. The glue runs also weakens the CPVC pipe walls and have replaced piping with visible exterior degradation.
5/10/2023 11:24:40 am
It's supposed to be after.
5/10/2023 12:05:33 pm
I 100% agree that heads should basically be the last thing installed. Spears Flamegaurd installation book says…
Leave a Reply.
Subscribe and learn something new each day:
Top May 2023 Contributors
Get 100 Days of Free Sample Questions right to you!
PE PREP SERIES