Cylinder oxide layer
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For carbon steel atmospheric pressure vessels, the design drawings do not require anti-corrosion treatment for the inner wall of the cylinder. As a considerable amount of time has passed since their manufacture, the oxide layer on some of the steel plates on the inner wall of these devices has peeled off. I wonder whether there are any explicit provisions in the standards for atmospheric pressure vessels that would classify such devices as non-compliant
Whether it is a pressure vessel at normal pressure or a pressurized vessel, corrosion margin must be considered during design. If the oxide layer thickness is within the allowable range specified in the design, it can be considered qualified. Only the service life is reduced.
No, it still depends on the process conditions you specified; it’s not necessarily the manufacturer’s fault
Surface oxidation and flaking are normal; corrosion allowance is generally taken into account during equipment design. The thickness can be measured to determine whether it meets the requirements for strength and stability, which in turn helps decide whether it can be used. If not used for an extended period, it should at least be kept dry; for critical equipment, nitrogen filling can be considered to prevent oxidation (nitrogen is generally used to fill equipment shipped by sea).