Flange is also known as flange or flange. Flanges are parts that connect pipes and pipes and valves to each other, and are connected to the pipe end. There are holes in the flange, and the bolts tightly connect the two flanges. The flanges are sealed with gaskets.
There are many unqualified factors for flange quality. First, the roundness of the outer circle is not enough, the thickness of the middle plate is not enough, and the roundness of the inner circle is not accurate enough, etc. These are the main factors affecting the quality of the entire flange. In order to prevent micro-leakage of the flange, the protective gas in the furnace should maintain a certain positive pressure. If it is hydrogen protective gas, it generally requires more than 20kBar.
The most important thing is that the large-diameter flange must be tested for pressure when it leaves the factory. According to the result of the pressure test, it is determined whether the flange is qualified. The inspection method can also be wiped with soapy water on the joint gap of the large-diameter flange to see if there is air leakage. . As long as all inspections meet the standards, this is a qualified large-diameter flange.
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