Selection of valves for oxygen pipelines
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According to GB16912 Section 8.5.1, gate valves are strictly prohibited for oxygen pipelines with a working pressure greater than 0.1 MPa. Does this regulation apply only to gas-phase pipelines? Are liquid oxygen pipelines not included? If liquid oxygen pipelines are not included here, then do chapters 8.4, 8.5, 8.6, and so on also not cover liquid oxygen? I hope experts can give me some guidance!
“According to GB16912, clause 8.5.1, gate valves are strictly prohibited for oxygen pipelines with a working pressure greater than 0.1 MPa. Are the operating conditions for oxygen pipelines the same as those for liquid oxygen pipelines?
Rust, dust, and slag inside the pipes come into friction with the inner walls of the pipes or valve openings, generating high temperatures that lead to combustion. This phenomenon is related to the type and size of the impurities as well as the flow velocity of the gas; iron powder tends to burn easily in the presence of oxygen, and the finer the particle size, the lower the ignition point； The faster the gas flow rate, the more likely combustion will occur. Given the characteristics of gate valves, they are not suitable for regulating flow and pressure; otherwise, the sealing surfaces wear out quickly, resulting in a decrease in tightness. Since gate valves cannot be used to regulate pressure by opening them slowly, they are not suitable for oxygen pipelines
I want to know if gate valves can be used for liquid oxygen pipelines