Pressure pipeline
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For pipes at 16 MPa, with 100% flaw detection, what grade are the inspection films? Is a pressure test for leak detection also required after 100% flaw detection?
Generally, 100% X-ray inspection at grade II is considered satisfactory; however, 100% inspection does not exempt the equipment from pressure testing, unless approved by the designer.
It is specified in GB50184
This post was last edited by ycyycy1000 on 2018-7-11 09:11. Part 5 of the Code for Pressure Piping GB/T20801.5-2006, which is titled \"Code for Pressure Piping – Industrial Piping\", specifies the basic safety requirements for the inspection, testing, and examination of industrial metal pressure pipes. Section 6.3.2 of the standards, titled \"Radiographic and ultrasonic testing of welded joints,\" specifies that it depends on the type of inspection method used: radiographic testing or ultrasonic testing. 2) Welded joints that are subject to 100% radiographic testing are considered to meet the requirements of JB 4730 Grade II, while those that are inspected by sampling or only partially through radiographic testing meet the requirements of JB 4730 Grade III ； 3) Welded joints subjected to 100% ultrasonic testing meet the requirements of JB4730 Grade I, while those tested by sampling or partially by ultrasonic testing meet the requirements of JB4730 Grade II.
Generally, 100% X-ray inspection at grade II is considered satisfactory; however, 100% inspection does not exempt the equipment from pressure testing, unless approved by the designer.
Neither party will agree without conducting a withstand voltage test: lol