ASTM A192 Standard Specification for Seamless Carbon Steel Boiler Tubes for High-Pressure Service
Amazon.com: WUXUN-Valve 1/8 1/4 3/8 1/2 Check Valve BSP Female Air Check Valve Nickel-Plated 1 Way Non Return Valve for Boiler Pressure Vessel ( Specification : 1/2") : Industrial & Scientific
BS 3059-2 620-460 Standard Specification for Steel Boiler and Superheater Tubes Part 2. Carbon, Alloy and Austenitic Stainless Steel Tubes with Specified Elevated Temperature Properties, Boiler Steel Pipes, Boiler Steel Tubes, Superheater