Utilization of Available Metal and Commercial Thickness Plate

After the minimum thickness has been determined, including corrosion allowance, vessels are often brought to the next highest commercial plate thickness. This raises the question of what to do with the thickness gained by specifying standard commercial plate. The usual practice is to call this extra plate thickness corrosion allowance, for two reasons:

• Increasing the allowable pressure of a vessel might necessitate redesign of several other pieces of equipment in its system in order to prevent the other pieces from limiting the system.
• The ability to predict corrosion rates is not as precise as the ability to calculate pressure and structural requirements.

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