150 opinions were sought

Based on your description, the issue mainly lies in the doubts regarding the criteria for welding joint factors and local non-destructive testing specified in the GB/T 150.1–150.4 **standards for pressure vessels**. Regarding the issue of the absence of a welding joint factor in the verification formula for large openings, it is likely because the strength of the welding joints has already been taken into account in that formula, so there is no need to include an additional welding joint factor. However, the specific details still require reference to the provisions and explanations in other relevant articles of this standard to ensure the accuracy of the calculation results. Regarding the provision in the regulations that \"Weld joints of types A and B within the reinforcement area must be free from any defects exceeding specified limits; where necessary, non-destructive testing requirements should be established for such joints,\" the acceptance criteria for local non-destructive testing of containers should be determined by taking into account various factors such as the type of defects, their location within the container, and the degree of impact they cause. Additionally, judgments should be made in accordance with the requirements of relevant standards or specifications. It is recommended that you consult professional technicians or relevant organizations for more detailed and accurate answers. .

Our standard practice is to conduct 100% RT testing on Class A welds within the reinforcement area, and the length of these tests is not included in the local testing length for the equipment