Corrosion protection for oxygen pipelines?
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The company has the previous oxygen station; since the users require that the oxygen contain no iron and that its water content be extremely low (dew point of -60 degrees Celsius), I would like to know whether it is necessary to use stainless steel pipes for transportation, or whether carbon steel pipes can be used instead Based on an oxygen flow rate of 10 meters per second in the pipeline, what will be the degree of wear caused by oxygen on the pipeline? Thank you!
I haven’t checked the relevant standards, but the oxygen pipes in our factory are all made of stainless steel. Moreover, the areas where these pipes come into contact with the pipe racks are insulated using asbestos boards. Before transporting the medium, the inside of the pipes is thoroughly degreased; the requirements are very strict. We have experienced a serious accident involving an oxygen pipeline here; it is said to have been caused by residual grease inside the pipe, so be extremely careful.
Stainless steel is too expensive; if the transmission pressure is low, carbon steel pipelines with internal coating can be considered, for reference only.
It is dangerous to use coated pipes. The most common choice is stainless steel pipes, and the degreasing requirements are quite strict. As for the wear amount, it is generally determined based on experience
Oxygen pipelines can be constructed using stainless steel or seamless fluid steel pipes for transportation. Before pipeline installation, the pipes must undergo strict degreasing treatment before they can be used. The welding requirement is to groove the pipe and perform TIG welding. Welding with electric welding is not allowed. After the piping is installed, a strength test must be conducted. Withstand voltage test. And conduct flaw detection testing. The pipeline needs to be equipped with grounding wires, as well as jumper wires for the valve flanges. Oxygen valve instruments must be valves and instruments specifically designed for oxygen. It must be degreased with carbon tetrachloride during installation before it can be used. Wear can be ignored. “If the conveying pressure is low, carbon steel pipelines with internal coating could be considered,” but I have never heard of such a method. I don’t know how I came up with it either.
How exactly is defatting done? Are there any references available? Thank you.
Degreasing solutions vary depending on the material. You can look up the **standards** for degreasing equipment pipes. There is also the pipeline purging, which must be carried out rigorously before pipeline transportation. This is very important, remember that! The purge standard is oil-free and water-free compressed air or nitrogen. The flow velocity should be no less than 20 m/s