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Generally, it is recommended that PSVs be inspected and tested at least once a year to verify that they are operating correctly and within design specifications. Additionally, PSVs should be periodically calibrated to ensure that the opening pressure is within acceptable limits and certified to demonstrate compliance with applicable standards and regulations.

However, depending on operating conditions, PSVs may require inspections, tests, and calibrations at shorter or longer intervals. For example, if the valve is exposed to corrosive fluids or gases, more frequent inspections and tests may be necessary. On the other hand, if the PSV is operating in a controlled environment and does not exhibit performance issues, it may be possible to extend the intervals between inspections.

In any case, it is important to follow the manufacturer's recommendations and applicable standards and regulations to determine the appropriate frequency of inspections, calibrations, and certifications of PSVs.

The identification of industrial valves that require maintenance during a factory shutdown can be done through advance planning, which involves a detailed analysis of each equipment and its operating condition. Some common strategies used to identify valves that need maintenance include:

1. Maintenance History Analysis: Checking which valves had issues during previous factory shutdowns or during normal plant operation.
2. Visual Inspection: Conducting a visual inspection of all valves to detect signs of wear, corrosion, or damage.
3. Data Analysis: Using data collected by sensors or monitoring systems to identify valves that have performed below expectations.
4. Risk Analysis: Prioritizing maintenance of valves that pose a higher risk to plant operation, such as those that control critical processes or handle hazardous fluids.

A combination of these strategies can be used to ensure that all valves needing maintenance are identified and included in the factory shutdown planning.