If a vessel is structurally sound but corroded, what can be done regarding its operation?

When a vessel is found to be structurally sound but has areas of corrosion, derating the vessel is a prudent approach to ensure safety and integrity during operations. Derating involves reducing the allowable operating pressure and/or temperature of the vessel, which compensates for the loss of material due to corrosion. This adjustment recognizes that although the vessel may still be structurally sound, the corrosion could affect its performance and long-term reliability.

By derating the vessel, operators can minimize the risk of failure and maintain safe operating conditions while allowing for continued use. This practice helps ensure that the vessel remains within acceptable safety margins, considering the diminished thickness of the material in corroded areas. It also provides an opportunity for further monitoring and assessment to plan for repairs or replacements as needed.

Continuing operations at usual levels, raising operating pressures, or shutting down immediately may not necessarily address the underlying issues effectively, nor might they support optimal operational safety under the circumstances of corrosion. Derating allows for a balanced approach to management and operational continuity while prioritizing safety.