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Are there any requirements for sloping drain pipe on sprinkler systems? In this case the project is just a basic wet pipe sprinkler system.
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4 Comments
Wayne Ammons
1/23/2019 10:05:19 am
Wet pipe system piping is permitted to be installed level. Only dry pipe and preaction system piping is required to be pitched to drain and tie-in drains on dry pipe and preaction systems shall be pitched as well. Sections 8.16.2 and 8.16.2.5 - NFPA 13, 2016 edition.
Rusty Scott
1/23/2019 11:36:40 am
Sprinkler Drain piping not being required does not necessary mean it shouldn't be done. If running a long horizontal distance before exiting (with most drain piping being 2" or smaller) a sloped drain would be a logical idea. On the Plumbing side, a 2" waste/rain water pipe would be sloped 1/4" per foot. Looking at it with a non-code perspective lens a 1/8" per foot slope is a reasonable idea since this is relatively "clean" water, I say that knowing people will disagree with that statement. Especially if you've ever been dumped with sprinkler water like I have. It will only aid the system in the drain time wise. Drain Time normally isn't a factor unless you're the installer who's waiting to fix a leak. Also an air relief valve at the highest point of the system aides in the filling and draining time.
I work with fire alarm systems. I can't tell you the number of times I have had to go on site to fix the fire alarm system because of false alarms on the sprinkler system.
Piero Piemonte
1/23/2019 11:07:27 am
European Norm EN12845 on 17.1.8 indicates minimum slope values only on dry and preaction systems (branches at least 0,4% and distribution 0,2% towards the drain valve). Leave a Reply. |
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