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Does NFPA 13D require trapped air to be removed in a sprinkler system?
In the 2016 NFPA 13, Section 7.1.5, Air Venting - a single air vent for a sprinkler system, with a connection conforming to 8.16.6, shall be provided in each wet pipe system utilizing metallic pipe. I am using CPVC with anti-freeze in most residential systems. Is there a code requirement for a vent for what I'm doing? Thanks in advance. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
7 Comments
Jim Phifer
8/11/2023 08:07:26 am
The requirement in NFPA 13 for air venting is only required when using metallic pipe in a wet pipe system. You're using CPVC, a non-metallic pipe.
JI
8/11/2023 08:10:35 am
The air vents are used to help reduce corrosion. Corrosion is not an issue for CPVC. An expansion chamber would be required for thermal contraction.
Jesse
8/11/2023 08:23:33 am
The standard only applies to metallic pipe, not CPVC.
BK
8/11/2023 08:49:04 am
In addition to the comments by others, understand in the 2016 edition that air venting can be a manual valve per 8.16.6. These are helpful for hydrostatic testing when not concerned with corrosion.
Alex
8/11/2023 11:44:59 am
echoing others - not required with CPVC
Robert
8/14/2023 08:28:38 am
Anti-Freeze? I thought there is a ban to anti-freeze use because of the flammability issue.
Janak Patel
8/16/2023 02:05:56 pm
Though corrosion is not an issue for CPVC pipe, venting the trapped air is a 'best practice'. The trapped air delays the anti-freeze/water to come out from the opened sprinkler. Expansion of the trapped air during summer exerts additional pressure on the valve flapper further delaying the opening of the valve in an event of the system activation due to a potential fire. Leave a Reply. |
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