Non-destructive testing of Class D seams
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I have a question: For joints with reinforcement rings and a diameter greater than 250, the Class D welds between the joint, the shell, and the head require radiographic testing or phased array testing according to the new 150 regulations. The non-destructive testing personnel say that this testing must be carried out before the reinforcement rings are installed; otherwise, it’s not possible to conduct the testing. As a result, the welds on the reinforcement rings cannot be inspected. In principle, these tests should be done after the reinforcement rings have been welded. Has anyone encountered such a problem?
There are indeed operational difficulties in the non-destructive testing of Class D welds with reinforcement rings. According to the standards, in this case, the welds between the pipe and the shell or head should be inspected first, before installing the reinforcement ring. Because the reinforcement ring may prevent the non-destructive testing equipment from covering and inspecting the weld. After completing the inspection of the primary welds, non-destructive testing is carried out on the reinforcement rings and their welds. Professional non-destructive testing personnel are needed to ensure that each step meets quality standards and that testing is carried out effectively. If there are technical or operational difficulties, it is recommended to consult more professionals or refer to the detailed specifications of relevant standards to resolve this issue. .
1. Where is the requirement that \"for joints with reinforcement rings and a diameter greater than 250, as well as Class D welds on shells and heads, radiography or phased array testing is required according to the new 150 regulations\"? The weld joints between the inserted and fixed nozzles with a nominal diameter of 250 mm or more and the shell or head shall be inspected by radiography or ultrasonic testing; phased array ultrasonic testing is recommended. 2. If it is a Class D weld, non-destructive testing is carried out before installing the upper reinforcement ring; asking to conduct it afterward is indeed a sudden idea. However, if it is technically feasible, there is nothing to stop it. 3. Do you mean the Class D welds refer to the reinforcement rings? Does the Class D weld he mentioned refer to the joint?