This standard is applicable to the strength calculation of pressure components such as newly-built chemical industrial furnace tubes (including straight tubes and bent tubes) and related connecting parts such as headers (manifolds), tees, and special-shaped pipe fittings. This standard does not apply to the calculation of the strength of internal pressure cylinders, heads and components of new chemical industrial furnaces with refractory linings, such as gasifiers, two-stage reforming furnaces, etc.
HG/T 20589-2011 Referenced Document
API RP 941 Steels for Hydrogen Service at Elevated Temperatures and Pressures in Petroleum Refineries and Petrochemical Plants (Eighth Edition)*, 2016-01-01 Update
ASTM A106 Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service