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IN PRESSURE CONTAINMENT, the inspector shall verify that the installation of new materials is consistent with the selected or specified construction materials. This material verification program should be consistent with API RP 578. Using risk assessment procedures, the owner/user can make this assessment by 100-percent UL Standard verification, PMI testing in certain critical situations, or by sampling a percent- age of the materials. PMI testing can be accomplished by the inspector or the examiner with the use of suitable methods as described in API RP 578. If a piping system component should fail because an incor- rect material was inadvertently substituted for the proper pip- ing material, the inspector shall consider the need for further verification of existing piping materials.
The extent of further verification will depend upon circumstances such as the con- sequences of failure and the likelihood of further material errors. The owner/user shall assess the need and extent regarding application of the practices consistent with API RP 578 addressing inadvertent material substitution in existing alloy Control valves or asme bpvc section viii div 1 other throttling valves, particularly in high-pressure drop-and-slurry services, can be susceptible to localized corrosion/erosion of the body downstream of the orifice. If such metal loss is suspected, the valve should be removed from the line for internal inspection. The inside of the downstream mating flange and piping also should be inspected for local metal loss.
When valve body and/or closure pressure tests are per- formed after servicing, they should be conducted in accor- dance with API Std 598. Critical check valves should be visually and internally inspected to ensure that they will stop flow reversals. An example of a critical check valve may be the check valve located on the outlet of a multistage, high head hydroprocess- ing charge pump. Failure of such a check valve to operate correctly could result in overpressuring the piping during bing.com a flow reversal. The normal visual inspection method should include: a. Checking to insure that the flapper is free to move, as required, without excessive looseness f
