Corrosion allowance of austenitic stainless steel in LNG medium
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I saw several drawings of large ASME storage tanks for export. When the medium is liquid nitrogen, oxygen and argon, the design temperature is -196°C, the cylinder is austenitic stainless steel, and the corrosion margin is 0 ； But when the medium is LNG, the corrosion margin is still 0. Let’s discuss, is this correct?
I have not heard that LNG corrodes austenitic stainless steel, so in my personal opinion, there is nothing wrong with setting the corrosion margin to 0.
We entered the LNG field relatively late. What I learned is that LNG generally has a lot of impurities and is said to be quite dirty. I don't know if there is corrosive media. So I'm a little worried, like: Carburization caused by carbon arc gouging during welding ； Whether ordinary austenitic stainless steel can resist corrosion from impurities.
Correct, if austenitic stainless steel is used for pressure vessels and pipes, as long as it is not a strong acid (except for acetic acid, Monel steel is used for acetic acid) or strong alkali, the corrosion allowance is generally 0.
should be correct. I checked the company's relevant information on LNG design and found that when it comes to 316L and 304 stainless steel, the corrosion margin is 0.
Is this also the case when the medium contains chloride ions?
The corrosion allowance of stainless steel is set to 0, mainly because of its good corrosion resistance.
Austenitic stainless steel can generally go to 0