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This post was last edited by chenjdvip on 2022-8-27 15:07 under Regular Inspection
This post was last edited by xlxuiin on 2021-11-12 at 12:58. If the depth of the pit is greater than the wall thickness allowance, the crack must be ground away; G0 should be less than 0.1. If the pit is within the allowable range, it does not affect the grading
1. The original poster has created a good series; thumbs up. 2. Is it a design issue or a manufacturing issue with the cross-weld seams? Should this problem be referred back to the design office and the manufacturing plant? 3. Regarding crack treatment, I agree with your view; however, care needs to be taken when operating this equipment
The initial inspection for general equipment is every 3 years; in this scenario, the specific causes of the cross-welds are not taken into account, only whether the safety rating of the equipment’s current condition is affected.
The rating for cross welds alone is level 3. According to the code, patch welding the pit is the simplest method. Is the material special, or are the conditions on site insufficient?
No, it should be set at level 2-3. Reason: Due to the reasonable structural layout, no new defects appeared in the cross welds during the inspection period, so it does not affect the grading. After grinding the crack defect, the depth of the pit is greater than the remaining wall thickness; the dimensionless value G0 is < 0.1, so the pit is within acceptable limits and does not affect the grading.
If the pit does not exceed the specified limits, it is still best not to perform welding repairs; the stress resulting from local welding repairs is difficult to eliminate
Cross welds are difficult to resolve, but the others can be repaired by welding!