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RR729 - Establishing the requirements for internal examination of high hazard process plant

Low pressure cryogenic storage vessels are routinely left in service for long periods of time without examination of the internal surfaces. This approach to examination is being considered and applied for pressure vessels storing other products at warmer temperatures, but where the 'service' may also be declared 'clean and non-corrosive'. However, there is a need to establish the circumstances where intervals between internal examinations could be justifiably extended on the basis of a risk-based inspection (RBI) assessment, especially when the consequences of failure would be high.

This report and the work it describes were funded by the Health and Safety Executive (HSE). Its contents, including any opinions and/or conclusions expressed, are those of the authors alone and do not necessarily reflect HSE policy.

Visit the RR729 report (PDF) [12]

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Updated 2021-04-23