About oxygen in pipes
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As shown in the picture, when designing the oxygen pipeline, why should the oxygen between the two quick shut-off valves be drained before 28 kilograms of oxygen enters the ethylene mixer? Why are the delay time settings of the two quick shut-off valves different?
This is relatively high-end @RedLee_ZZHI @great.wang @liuquan1100 @ylb913 @leo_0088 @sea7000
Why didn’t the great gods reply? Isn’t the New Year over yet?
High-pressure oxygen is very dangerous, and accidents can happen even if you turn it on and off quickly.
The picture is not clear. Personally, I think the valve must be made of stainless steel. If the flow rate is too fast suddenly, static sparks may occur and cause a deflagration accident.
I have seen this done with fuel gas, but not with oxygen. I don’t know if it is necessary.
Article 5.5.9 of GB 50316-2000 (2008 edition) shall not use quick-opening or quick-closing valves for oxygen pipelines. The provisions are under interpretation: Valves whose handles are rotated 90° to open or close, or valves whose switching speed is equivalent or faster, are quick-opening and quick-closing valves. Personally, I think the original intention of this article is to ensure the intrinsic safety of the system. In actual selection, it is difficult to guarantee that 100% quick-opening and quick-closing valves will not be used. In this case, other measures need to be taken to ensure system safety. The question raised by the poster may be based on the measures taken based on the intrinsic safety of the system.