Proportion of weld inspections for process pipeline joints
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I would like to ask the experts here: does anyone know what the proportion of flaw inspection for welds in process pipelines is? The medium inside the pipe is liquefied petroleum gas, primarily composed of propylene and C4 components. I hope fellow users can provide an answer; thank you all for your help
The information provided by the poster is not sufficient, so it’s difficult to give a direct answer. You can refer to the \"Code for Construction and Acceptance of Industrial Metal Piping Projects\" GB50235-1997, as the relevant regulations are outlined there.
Liquefied gas falls under Category A1, but it lacks design temperature and design pressure. 100% radiographic inspection is required when the design pressure is 10 MPa or higher, or when the design pressure is 4 MPa or higher and the design temperature is 400°C or higher ； 20% radiographic inspection is performed when the design pressure is less than 10 MPa and the design temperature is less than 400°C.
Reply to the comment on floor 2: The conditions provided by the original poster are not sufficient, so it’s difficult to give a direct answer. You can refer to the \"Code for Construction and Acceptance of Industrial Metal Piping Projects\" GB50235-1997, as the relevant regulations are outlined there. It seems to be outdated; are there any newer standards for pressures below 4 MPa? The temperature is below 150 degrees. In response to the comment on floor 3: Could you tell me where your regulations come from? Could you provide me with more detailed information? Thank you.