Effective thickness for the verification of pressure equipment
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Measured minimum thickness – corrosion margin to the next cycle. However, a corrosion rate of no more than 0.1 mm/a can be considered mild for pressure vessels, while it is 0.05 mm/a for pressure pipelines. If this corrosion rate is exceeded, can the minimum thickness measured in the older version minus 2* the corrosion amount over the subsequent period be used?
When using the older version to calculate the minimum thickness as -2* plus the corrosion amount over the subsequent period, special attention is required; this method is only applicable to cases of mild or moderate corrosion. If the corrosion rate exceeds the specified values, more rigorous calculations and verifications must be carried out in accordance with relevant standards and specifications. Therefore, an analysis should be conducted based on the actual circumstances, an appropriate calculation method should be selected, and it is necessary to ensure compliance with relevant standards and specifications. .