Mechanical Integrity Inspection Frequency — OSHA Letters of Interpretation

OSHA's RAGAGEP enforcement memo explains that (j)(4)(iii) requires inspection and test frequencies consistent with manufacturers' recommendations and good engineering practice, and more frequently if prior operating experience shows it is needed, meaning the condition of the equipment at previous inspections. Inspectors review the employer's written procedures to identify the RAGAGEP it selected. Deviating from a "shall" in your chosen RAGAGEP is presumed a violation; departing from a "should" is not, if you document that the equipment complies with RAGAGEP.

A manufacturer with frequent routine and external visual inspections asked how much paperwork (j)(4)(iv) requires. OSHA said recording only conditions needing attention is acceptable if the procedure makes clear that no finding means a satisfactory result, records may be organized by process unit and kept electronically if readily retrievable, and inspection records must be kept for the life of the process. OSHA noted that both good and bad results are used to set inspection and test frequencies based on operating experience.

A chlorine repackager asked whether disassembling, inspecting, reassembling, and testing valves on returned cylinders and ton containers falls under mechanical integrity. OSHA said yes, including the documentation requirement in (j)(4)(iv), once the cylinder or container is connected to a covered process. A one-ton chlorine container is itself a covered process because it holds more than the 1,500-pound threshold, so its valve and appurtenances must be maintained under (j).