Specs, UL&cUL

  We offer ASTM A135/A795 SCH 7,10,40 UL&cUL listed external galvanized/internal black hot-rolled steel fire sprinkler pipes in various sizes, including 1-1/2", 2", 2-1/2", 3" and 4". 

UL&cUL Listed: Yes (UL 852), EX15151. The following is UL document.

Engineering & Insurance Compliance Note: Navigating FM Standard

​  Our steel sprinkler piping is UL & cUL listed (UL 852) and engineered with a highly specific, dual-surface configuration: an externally galvanized surface paired with a 100% clean, non-galvanized bare-metal interior.

​  Because this advanced hybrid design is uniquely engineered to physically eradicate MIC, it currently falls outside the legacy testing scope of the standard FM Approvals program for basic steel pipe. This is a classification limitation, not a performance failure. For Mission-Critical facilities insured by FM Global, this system is strategically designed to be approved via Owner Variance. Here is why our UL/cUL listed piping remains the optimal, risk-averse specification:

Aligned with FM’s Own Risk Data: Our design directly supports FM Global Property Loss Prevention Data Sheet 2-1, which strongly cautions against internally galvanized steel pipe in wet systems due to heightened corrosion risks. Our clean, non-galvanized interior perfectly answers this exact FM mandate.

Passive Component Acceptance: In the eyes of property insurance reviewers, steel piping acts as a passive structural component. As long as active equipment (like the Nitrogen generator) holds the required FM certifications, field engineers routinely accept our UL-listed, ASTM-compliant piping because it actively eliminates the massive financial risk of MIC leaks.

​The Comprehensive Acceptance Package: To empower underwriters to confidently approve the system, we provide a complete engineering package. This includes our UL/cUL listings, the Clean-Pipe Evidence Pack, and project-specific commissioning records (WPNI/DPNI).  By explicitly aligning with FM Global Data Sheet 2-1, our system provides the exact verifiable data risk reviewers require—effectively eliminating the financial risk of MIC, and positioning the facility to safely secure and maintain its premium FM insurance coverage. 

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