1.1 This standard stipulates strength calculation methods and relevant structure regulation of pressure components for fixed type shell boilers and cast iron boilers with fire tube and (or) furnace pipe welded by soft steel or low-carbon manganese steel.
1.2 This standard is applicable to steam boilers with rated steam-pressure no larger than 2.5 MPa and hot water boilers with rated water outlet pressure be no less than 0.1 MPa, but hot water boilers with rated water outlet pressure less than 0.1 MPa may be used as reference.
1.3 Design, manufacture, installation, usage, repair, and rebuild of boilers shall confirm to current national regulations "supervision regulation of security technology for steam boilers", "supervision regulation of security technology for hot water boilers,” relevant boiler-making technical conditions, and other relevant national standard.
