Summary of Technical Requirements for Pressure Vessels (13)

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Mandatory requirements for high-pressure vessels: The mandatory requirements for high-pressure vessels (10 MPa ≤ P < 100 MPa) are as follows: 01 When the thickness of the steel plate used for the vessel shell (excluding the plates of multi-layer vessels) is 12 mm or more, ultrasonic testing must be conducted on each plate, with a pass grade of Grade II. 02 Steel pipes of Classes III and IV as specified in GB/T12771 shall not be used. 03 Steel pipes specified in GB/T24593 shall not be used. 04 Heat exchange tubes shall not be of Class VI steel pipes as specified in GB/T21832. 05 If a fixed-type fitting is used, there shall be no delamination in the steel plate section at the shell opening: (1) The steel plate at the opening shall undergo ultrasonic testing and meet Grade II standards. (2) After boring, the cross-section of the shell steel plate shall undergo magnetic particle or penetrant testing, with a Grade I result being acceptable. Mandatory requirements for containers with large vibrations: The mandatory requirements for containers subjected to large vibrations are as follows: 01 When there are large vibrations, the tube sheet should be joined using expansion welding. 02 In cases of fluid pulsation, the unsupported span of the heat exchange tubes should be minimized as much as possible, or the flow pattern should be altered to prevent tube bundle vibration.