Hi,
* If you are not using nitrogen as your supervisory gas, you must use pipe that is resistant to internal oxidation and internally galvanized steel has historically been the most common choice for that. * If you are using nitrogen, you may use ordinary black steel instead, because nitrogen is inert and will not oxidize the pipe interior Regards, Yasser Amer Ahmed Senior Associate Fire Protection & Plumbing Specialist Registered Fire Protection Consultant MBA, LEED AP BD+C™, CPD, CFPS, MIFireE, PMSFPE, NFPA Technical Committee Construction Technical Support | Project Management & Contracts [cid:[email protected]]<http://dar.com/> Please consider the environment before printing this document [cid:[email protected]]<https://dar.com/news/details/dar%E2%80%99s-para-os-wins-digitalisation-initiative-of-the-year-at-the-big-5-global-impact-awards-2025?org=about> From: Fpdcdesign <[email protected]<mailto:[email protected]>> Sent: Monday, August 3, 2026 9:14 PM To: Sprinklerforum <[email protected]<mailto:[email protected]>> Subject: [Sprinklerforum] FM dry system piping ! External Email, Use Caution ! I am designing a small dry system for a FMGlobal insured. Their DS2-0, section 2.4.1.1.2.3 states for dry systems, use pipe that is “…resistant to internal oxidation…”. Exactly what does that mean? Internally galvanized? Other form of protection? 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) Confidentiality & Disclaimer Note: This e-mail (including any attachments) contain protected and confidential information intended for the sole use of the individual or organization addressee. If you are not the addressee or an authorized agent acting on their behalf, or if you have received this message by error, please notify the sender immediately be returning the message. It must not be copied, distributed or used in any other way but should be immediately deleted from your system. While Dar and the Dar Group strive to maintain high standards of communication, reliability, authenticity and integrity, neither shall be liable for the improper or incomplete transmission of the information contained in this communication nor for any delay in its receipt or damage to your system. Neither Dar nor the Dar Group guarantees that the integrity of this communication has been maintained or that this communication is free of viruses, interceptions or interference.
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