By American Petroleum Institute
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Additional resources for API RP 520 Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries-Part II—Installation
Inspect disk and holder for damage. Re-used holders shall be clean and free of debris, product buildup, and corrosion. Cleaning of holder should be done in accordance with the manufacturerÕs instructions. If the holder is damaged contact the manufacturer for repair or replacement. 7. Proper tools, including a torque wrench, should be used for installation. The ßange studs and nuts shall be clean and free running. 4 Removal of Used Devices 1. Verify there is no system pressure before loosening nuts.
With this arrangement, the pressure-relief valve with the lowest setting will be capable of handling minor upsets, and additional pressure-relief valves will be put in operation as the capacity requirement increases. For inlet piping to multiple relief valves, the piping that is common to multiple valves must have a ßow area that is at least equal to the combined inlet areas of the multiple pressure-relief valves connected to it. Refer to API RP 520, Part I, to determine set pressure of the pressure-relief valves based on maximum allowable pressure accumulation for multiple valve installations.
5. 1 API will consider written requests for interpretations of RP 520. API staff will make such interpretations in writing after consulting, if necessary, with the appropriate committee ofÞcers and committee members. The API committee responsible for maintaining RP 520, Part II meets regularly to consider written requests for interpretations and revisions and to develop new criteria dictated by technological development. The committeeÕs activities in this regard are limited strictly to interpretations of the standard and to the consideration of revisions to the present standard.
API RP 520 Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries-Part II—Installation by American Petroleum Institute