Is Blazemaster Permitted Underground?

8/31/2021

Working on a new resort hotel and it is necessary to have buried pipe before and after a sprinkler control valve.

Is it allowable by code to substitute C900 PVC pipe with Tyco Blazemaster pipe?

According to the installation guide of Tyco Blazemaster it could be installed underground.

If not, which material can be installed instead of C900 because 4-inch is the smallest size for this pipe?

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8 Comments

Alex

8/31/2021 07:20:26 am

Hi Anonymous,

NFPA 24 Chapter 10 discusses the requirements for underground piping. NFPA 24 (2019) 10.1.1.2 states that “piping specifically listed for use in private fire service mains shall be permitted to be used”.

From Tyco Blazemaster Installation Handbook (link below), Page 20 Listing and Approvals, it states that “Tyco CPVC pipe complies with the requirements… and is listed for a rated pressure of 175 PSI for underground service”

(FYI: When running your hydraulic calculations, the C factor for underground Blazemaster is 150)

Thanks,
Alex

Tyco Installation Handbook: https://www.tyco-fire.com/e-catalog/Tyco-CPVC-BlazeMaster-Install-Guide/#p=1

Anonymous

8/31/2021 10:40:17 pm

Thanks for the information, Alex!

According to local requirements (Mexico fire protection local code) is necessary to install Class 2 standpipes. In this scenario, with the new pressure and flow requirements Blazemaster is not longer an option. In conclusion, with the new scenario a 4" underground pipe is required.

Regards!

Glenn Berger

8/31/2021 08:12:39 am

***Verify the pressure losses through the underground network to the known supply point. *** 4 inch underground, while not unallowed, is atypical. Also check with the local authorities for having buried plastic pressure piping below a building slab.

Anonymous

8/31/2021 10:41:40 pm

Thanks for your comment Glenn!

John G

8/31/2021 11:12:22 am

I agree that most municipalities do not allow plastic underground. And also that the fire main be rated for 200 psi minimum. So please check local requirements and spec.
Class 200 blue brute is a much better pipe, when permitted.

Anonymous

8/31/2021 10:44:03 pm

Thanks John! I will check if Mexico fire code allows plastic underground.

Andres

8/31/2021 10:19:06 pm

By your description, I don't think your underground pipe can fit into "fire service mains". But if that's the intent of your piping I think you can get away with it following Alex's comment. Checking both NFPA 24 and 13, neither considers CPVC for Underground Pipe.

Something you need to take in mind is that both NFPA 13 and 24 mention plastic piping greater than 4" for Underground Piping, probably because the section is centered on its use for fire service mains.

Anonymous

8/31/2021 10:52:00 pm

Thanks Andres! As Alex said it could be an option according with their approvals. But as you mentioned, plastic pipes must be greater than 4" for fire service mains and for this new scenario ( Class 2 standpipes requirement per local code) there is no option to install a smaller supply pipe.

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Is Blazemaster Permitted Underground?

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