How does this crack occur?
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After three years of operation, the medium is low-pressure steam, the pipeline material is No. 20 steel, and the location is the welding between the straight pipe section and the elbow. Is this crack caused by erosion and corrosion, a welding quality problem, or fatigue vibration during pipeline operation?
Welding quality There are pores in the bottom layer of the weld,
Welding quality is the main factor, temperature change is the supplement
In addition to welding quality, it may also be related to pipe stress. Also consider the load relationship of your low-pressure steam when it enters the system.
Welding quality is the main issue. If it is legal, you can check the completion data corresponding to the pipeline. There should be non-destructive photos of the pipeline recorded in it, and just look for the corresponding welding joint. Generally speaking, there is a special inspection every two to three years.
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