Radiographic and ultrasonic testing of the weld joints between the inserted and fixed nozzles and the cylinder and head?
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Clause 10.3.3 of GB/T150.4-2024: Radiographic and ultrasonic testing of welded joints between plug and socket nozzles, as well as the shell and heads. Do all welding joints between the plug-in and fixed-type nozzles of pressure vessels and the vessel shell or head require radiographic and ultrasonic testing? For example, are pressure vessels of Class I such as some air storage tanks necessary?
According to the standards in GB/T 150.4-2024, radiographic and ultrasonic testing is required for the weld joints between the inserted and fixed nozzles and the cylinder and head. However, whether to apply this requirement to all pressure vessels still requires consideration of the specific types of pressure vessels and their operating conditions. For Class I pressure vessels, such as air storage tanks, whether such testing is required is usually determined by the design documents and safety assessments. It is recommended to consult relevant professionals or testing agencies for more specific guidance. .
Aren’t there still prerequisites specified in the new standard? DN≥250
This post was last edited by maiyi on 2024-11-16 at 17:19. So how should we understand 10.3.3b)? \"Weld joints between the inserted and fixed nozzles and the cylinder or head, which are not covered by the provisions of clause a) of this section, shall be subject to radiographic or ultrasonic testing in accordance with the requirements specified in the design documents.\" ”Huh? Paragraph a) refers to pressure vessels that are subject to “10.3.1 full (100%) radiographic or ultrasonic testing”; “other than as specified in paragraph a) of this article” refers to all pressure vessels that are subject to partial radiographic or ultrasonic testing ； The keyword “conduct radiographic or ultrasonic testing as specified in the design documents” means that only one of these two methods can be chosen; no other non-destructive testing methods are permitted. The design documents can only specify radiographic or ultrasonic testing, and it is not allowed to opt out of testing or to use magnetic particle testing or penetrant testing. Personally, I think this requirement is too strict; I hope everyone can discuss it.
According to the standard requirements, testing is necessary when DN≥250; failing to conduct such testing constitutes a violation of the standards
It is necessary to clearly understand the standard requirements; conditions are required
Whether to conduct testing or not depends on the provisions in the design documents. If the design documents specify that testing is required, then testing must be carried out. Conversely, if no provision is made, no testing is required.
The old version wasn’t tested either, and it’s managed to get through all these years.