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The issue of the inspection ratio for buried metal pipelines in CJJ33-2005

2022-02-10View Original

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In CJJ33-2005 5.2.8, regarding buried metal pipelines, it is stipulated that for welds for which the design documents specify a weld coefficient of 1, or those for which 100% internal quality inspection is required, the radiographic inspection of the internal quality of such welds must meet the quality requirements of grade II as specified in the current **standards for radiographic testing and quality grading of fusion welded butt joints in steel pipes». Could you please explain how exactly \"welds with a weld coefficient of 1\" are defined and classified? Is it the same concept as the \"weld joint coefficient\" mentioned in 3.2.5 of the \"Code for Design of Industrial Metal Piping\" (GB 50316)?

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