For pressure vessels, are welds that are not part of the main structure subject to flaw detection? In addition to the welds on the cylinder body and end caps, do the welds at the pipe openings and manholes also need to be inspected for flaws?
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For pressure vessels, are welds that are not classified as part of the main structure subject to flaw detection? In addition to the welds on the cylinder and end caps, do the welds at the pipe openings and manholes also need to be inspected for flaws? What standards must be followed for inspecting this for defects?
Whether welds of pressure vessels need to be inspected is usually determined based on the relevant design requirements and standards. For the welds of the cylinder body, heads, and other key connection points such as pipe ends and manholes, flaw detection inspections are generally required to ensure the quality of the welds and the safety of the container. Whether flaw detection is necessary and what method of flaw detection should be used shall be determined in accordance with the \"Regulations on Safety Supervision of Pressure Vessels\" as well as the relevant design documents and **or international standards, such as GB 150 \"Pressure Vessels\" and the ASME Boiler and Pressure Vessel Code. Based on these standards, it is possible to determine what types of welds require which types of non-destructive testing (such as X-ray inspection, ultrasonic testing, etc.). Generally, welds of higher importance and areas subjected to greater pressure or stress have stricter inspection requirements. .
The welds at the openings and manholes of pressure vessels also need to be inspected for defects. Refer to GB/T150.4-2024. As for how the so-called extraclass welds are defined?