JD, that k you for the information. When is says “…pressure doesn’t exceed 15 psi…”, does that mean air pressure, water pressure or both? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080 (tel:860-535-2080) (ofc) 860-554-7054 (tel:860-554-7054) (fax) 860-608-4559 (tel:860-608-4559) (cell)
> > On Mar 3, 2026 at 11:32 AM, <JD Gamble (mailto:[email protected])> > wrote: > > > > > > > Consider a Low Pressure Dry Pipe System > > > > Unlike wet systems, dry pipe systems aren’t prone to freezing because the > pipe is not filled with water. Instead, it’s filled with pressurized air or > nitrogen that keeps the valve to the water supply closed. When a sprinkler > head activates, the air pressure in the system drops, causing the valve to > open and releasing water into the pipes to be delivered to the fire sprinkler > heads. > > > > Tyco (Johnson Controls) and Viking BlazeMaster pipe is UL listed for use in > Light Hazard and Residential dry pipe sprinkler systems where the pressure > doesn’t exceed 15 psi and the ambient temperature is above -20ºF (-29ºC). A > dry pipe system utilizing BlazeMaster CPVC must be designed to provide > pressure relief when the system pressure exceeds 15 psi. Alternatively, the > system may be equipped with an alarm that sounds when the pressure exceeds 15 > psi. Other design and installation parameters are outlined in the > manufacturer’s installation guide. A link to Tyco’s is here > (https://docs.johnsoncontrols.com/tycofire/api/khub/documents/Y7NN9_1q7PoIN9081~sZ9Q/content), > and Viking’s is here > (https://www.vikinggroupinc.com/sites/default/files/documents/080712.pdf?__hstc=120511383.ac16f0333100f67a732406dc8ddd60c5.1668094726860.1700233678466.1700494728935.153&__hssc=120511383.1.1701212585389&__hsfp=1999393944&hsCtaTracking=b491017c-9540-4865-90). > > > > > A key benefit to using BlazeMaster pipe in a low pressure dry system is > that BlazeMaster CPVC is naturally resistant to corrosion and > microbiologically influenced corrosion (MIC), completely eliminating the > corrosion concerns, and the associated maintenance costs, that plague > metallic dry systems. > > > > > > > > > From the BlazeMaster Website > > > > > > > > > > > > > > From: Patrick Tomaszewski <[email protected]> > Sent: Tuesday, March 3, 2026 9:28 AM > To: Discussion list on issues relating to automatic fire sprinklers > <[email protected]> > Subject: [Sprinklerforum] Re: CPVC in dry system > > > > > > > > > > Never heard of this. > > > > Ive only ever seen standards and manufacturers documentation saying that CPVC > products are approved for wet systems only. > > > > > > > > Maybe instead of telling him no, you can ask client to produce the > documentation saying it is acceptable – we can do whatever the client wants > as long as it complies with codes, standards, manufacturer’s docs, and AHJ > approval. > > > > > > > > That way you don’t have to risk being wrong, while maintaining compliance > based on your own knowledge. > > > > > > > > > > > > > > > > > > > Patrick tomaszewski |Estimator > > > > www.valiantfireco.com (http://www.valiantfireco.comorg) > > > > [email protected] (mailto:[email protected]%C2%A0) > > > > 📍3910 Howe rd. Wayne, MI 48184 > > > > “Every Second Matters.” > > > > IG (https://www.instagram.com/valiantsec.mi/) • FB > (https://www.facebook.com/valiantsec.mi) • LINKED IN > (https://www.linkedin.com/company/valiant-security-llc) > > > > > > > > > > > > > > > > > > > From: Fpdcdesign <[email protected] (mailto:[email protected])> > Sent: Tuesday, March 3, 2026 11:21 AM > To: Sprinklerforum <[email protected] > (mailto:[email protected])> > Subject: [Sprinklerforum] CPVC in dry system > > > > > > > > > > > I had a client tell me this morning that there was something about CPVC being > approved for residential dry systems where low pressure dry valves were used. > I have never heard of it and can’t find any references about it. Before I > tell him no, is there something that I am missing? > > > > > > > > > > > Todd G Williams, PE > > > > > Fire Protection Design/Consulting > > > > > > Stonington, CT > > > > > > 860-535-2080 (tel:860-535-2080) (ofc) > > > > > > 860-554-7054 (tel:860-554-7054) (fax) > > > > > > 860-608-4559 (tel:860-608-4559) (cell) > > > > > > _________________________________________________________ SprinklerForum > mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to [email protected] >
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