Selection of steel material for the blind flange at the liquid level gauge port of natural gas pipeline separators
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Currently, the level gauge needs to be removed from the outlet of the gas pipeline separator, and then the opening should be sealed with a blind flange. The diameter is DN25, and the pressure ratings are either Class 600 or Class 900. In our case, is it acceptable to use a blind flange made of grade 20 steel, or must it be made of 16Mn3 steel? What are the differences in strength and corrosion resistance between these two materials?
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Natural gas storage tanks are all made of 16MN material; there is also a small amount of S in the natural gas, which still causes corrosion of the solution.