T/ZJBF 001-2024 Active

Main Technical Content: 5. General Design Requirements The design and use of oxygen flame arresters should be based on the design pressure, oxygen purity, adiabatic compression/expansion, friction, and vibration parameters of the piping system. A reasonable structure and suitable materials should be selected. **Length of the Intermediate Flame Arrester Section**: The length of the intermediate flame arrester section is determined according to the design needs, including the pre-valve zone and the outlet of the pressure regulating station, as well as the areas before and after the regulating valve. - **Pre-valve zone**: The length of the intermediate flame arrester section in the pre-valve zone should not be less than 500 mm. - **Pressure regulating station outlet and regulating valve**: The length of the intermediate flame arrester section at the outlet of the pressure regulating station and before the regulating valve should not be less than 1,500 mm, and it should not be less than 8 times the pipe diameter. - **Inlet and outlet manifolds**: - When the nominal size of the oxygen flame arrester section is ≥ DN150, the length of the inlet and outlet manifolds should not be less than 150 mm. - When the nominal size of the oxygen flame arrester section is < DN150, the length of the inlet and outlet manifolds should not be less than the outer diameter and not less than 50 mm. **Pipe Outer Diameter**: The outer diameter of the oxygen flame arrester section should be selected according to the standards specified in GB/T 9124.1, GB/T 9124.2, HG/T 20592, or HG/T 20615. The outer diameter of the intermediate flame arrester section and the inlet and outlet manifolds should be consistent. **Flange Type**: The connection of the oxygen flame arrester section should be a necked welded flange, and plate-type flat welded flanges should not be used. It should comply with one of the standards listed in 5.4 or according to the requirements of the order