Regarding the issue where the manufacturing date of the pressure vessel is later than the calibration date of the safety valve

The safety valve should be calibrated once a year. When supplied together with the pressure vessel at the time of shipment, it is necessary to ensure that it is still within its calibration validity period, and that its operating pressure meets the requirements of the safety technical specifications.

There is no requirement that the calibration date of the safety valve must be later than the date of manufacture of the container; these are two entirely different concepts. Safety valves are generally calibrated once a year; as long as the calibration is still valid when the container is in use, there is no issue. A usage permit must be obtained before using the container (within 30 days before and after it is put into use). Whether a safety valve can be used on this equipment depends on the requirements specified in the as-built drawings; the set pressure shall not exceed the container’s design pressure or its maximum allowable operating pressure ； The diameter is generally not less than that of the safety valve opening on the container; special requirements shall be followed in case of any such requirements ； For liquids, a fully open type is generally chosen; for liquids, a slightly open type is generally selected ； It is generally not allowed to install things such as stop valves between the safety valve and the container ； Safety valves must be calibrated before being put into use, with the calibration date typically being every 1 year.

It is acceptable as long as the next calibration date for the safety valve is after January 2019