I believe its ratio based. Not sure on the Viking but the Reliable DDX-LP has a 15 psi air at 100 psi water.
From: Fpdcdesign <[email protected]> Sent: Tuesday, March 3, 2026 9:47 AM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: [Sprinklerforum] Re: CPVC in dry system 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]<mailto:[email protected]>> Sent: Tuesday, March 3, 2026 9:28 AM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]<mailto:[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. [signature_2544299208] Patrick tomaszewski | Estimator www.valiantfireco.com<http://www.valiantfireco.comorg> [email protected] <mailto:[email protected] > 📍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]<mailto:[email protected]>
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