Do flow meter nozzles belong to pressure pipeline fittings?
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Do the flow meter nozzles at the Dangyang Gangshi Power Plant in Hubei belong to pressure pipeline fittings? Is the connection between the nozzles and the main steam pipeline a butt joint or a fillet joint? Additionally, experts have identified defects such as lack of fusion and incomplete welding in the welds; I wonder how to distinguish a lack of fusion defect from cracks
It should be a pressure fitting; the connection to the pipeline is likely to be done by butt welding.
The Special Equipment Inspection Institute in Dangyang, Hubei, says that the list of special equipment does not exist
It is indeed difficult to distinguish between lack of fusion and cracks; the conditions at the layer interfaces, at the groove edges, and at the root are all different. The image of lack of fusion is faint, with a gradual change in contour and a blurred tip, while cracks are thin but deep, with sharp tips that tend to extend along the direction of the stress. Watch more videos like this, and when doing repairs, after making an incision, take a closer look at the actual item and compare it with the videos – this way, knowledge can be acquired quite quickly.
Thank you, I’m referring to the actual item on site
Visual inspection of the actual product: No fusion? :lol
It is difficult to determine lack of fusion and cracks based on the fracture surface