RE: Popping point tolerance for safety valve and rellief valve
Refer to ANSI API 576 and 510 Inspection of Pressure relieving Devices.
The recommended practice describes the inspection and repair practices for automatic pressure-relieving devices commonly used in the oil and petrochemical industries.
This is just a guideline. there might be state codes for high pressure vessels and the popping point tolerances.
http://www.api.org/certifications/icp/programs/upload/510BOK0607-3.pdf
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