On the safety valve calibration label, should the set pressure be the design set pressure or the actual operating pressure?
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Regarding the pressure on the safety valve calibration plate, I believe it should be the differential pressure from the cold-state test (i.e., the actual operating pressure at the calibration bench), rather than the set pressure indicated on the nameplate.
Your understanding is correct. The calibration label of the safety valve should indicate the actual operating pressure, that is, the differential pressure during cold tests, rather than the design set pressure or the set pressure stated on the label. Because safety valves are affected by various factors during use, such as temperature, the medium, and particles, there is a difference between the actual operating pressure and the set pressure. Therefore, when conducting verification, the actual operating pressure should be used as a reference to ensure the proper functioning of the safety valve. .