What is the meaning and function of the holes on the side of the backing ring flange?
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Ask the experts what the holes on the side of the backing ring flange mean and what they do.
Used for product thinking. Leak detection of the gasket seal.
Does the number 7 below the DN mean the welding distance between the sub-joint welded to the flange and the lining ring?
Pressure test, leak detection, leak signal hole.
I have only seen this kind of flange in standards before, but I have never come into contact with it in actual work. Please tell me, under what conditions is this kind of ring flange generally used, what are its advantages and disadvantages, and what are the key points to pay attention to compared with ordinary flanges?
It is used for leak detection in air tightness tests to check whether the welds between the flange and the sub-joint and the weld between the sub-joint and the flange lining ring are leaking. Another purpose is to discharge the air in the gap of the lining ring when the equipment is running.
So that’s it. This kind of small hole in the flange is often seen but never thought about!
The biggest advantage can significantly save costs. During the manufacturing process, special attention must be paid to the quality of welding and post-weld leak detection.