Equipment corrosion exceeds the corrosion margin
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What if the equipment’s corrosion exceeds the corrosion allowance?
Whether it is a pressure vessel or a atmospheric storage tank, if the corrosion margin has been exceeded, a strength check is carried out first. Then analyze each case on its own.
First, conduct a strength check, and then determine based on the results whether it can be used further
Conduct a strength check to determine whether it can still be used, and then determine the inspection interval based on the corrosion rate.
Strength verification – we’ll discuss it after calculating the corrosion rate!
First, conduct a strength check to determine that the corrosion rate has exceeded the corrosion margin； If it is equipment in a critical area, the equipment should be replaced immediately, or it should be protected or its material upgraded. Since the material of the equipment and the corrosion rates vary in different parts, accidents can easily occur; one cannot rely on luck.
Even for the same material in the same area, the corrosion rate can vary. Accidents caused by perforations or thinning are relatively common, especially in equipment operating under high temperature and pressure.
How can one tell that the equipment corrosion has exceeded the corrosion allowance? Is it measured?
Just because it exceeds the corrosion allowance doesn’t necessarily mean it has to be scrapped; the strength needs to be re-evaluated. The equipment thickness takes into account a negative deviation in the steel plate thickness as well as the corrosion allowance, and it is also adjusted afterward.