There are 7 common reasons for flange leakage.

There are 7 common reasons for flange leakage.

Partial mouth
Partial mouth means that the pipe and the flange are not perpendicular, not concentric, and the flange faces are not parallel. When the internal medium pressure exceeds the load pressure of the gasket, flange leakage will occur. This situation is mainly caused during installation, construction or overhaul, and is easier to find. As long as the actual inspection is carried out when the project is completed, such accidents can be avoided.
2. Wrong words
Wrong mouth means that the pipe and the flange are perpendicular, but the two flanges are not concentric. The flanges are not concentric, causing the surrounding bolts to not penetrate the bolt holes freely. When there is no other way, only reaming or using a smaller bolt to penetrate the bolt hole, and this method will reduce the tension of the two flanges. In addition, the sealing surface line of the sealing surface is also deviated, so leakage is very easy to occur.
　3. Open your mouth
Opening the mouth means that the flange gap is too large. When the flange gap is too large to cause external loads, such as axial or bending loads, the gasket will be impacted or vibrated and lose its pressing force, thereby gradually losing the sealing kinetic energy and leading to failure.
　4. Wrong hole
Wrong hole means that the pipe and the flange are concentric, but the distance between the bolt holes of the two flanges is relatively large. The wrong hole will cause stress on the bolt. If this force is not eliminated, it will cause shearing force on the bolt. If it takes a long time, the bolt will be cut and the seal will fail.
　5. Stress
When the flange is installed, the two flanges are relatively standardized, but in the production of the system, after the pipeline enters the medium, the temperature of the pipeline will change, which will cause the pipeline to expand or deform, so that the flange will be subjected to bending load or shear force, which is easy Cause the gasket to fail.
　　 6. Corrosion effect
Due to the long-term erosion of the gasket by the corrosive medium, the gasket will undergo chemical changes. The corrosive medium penetrates into the gasket, and the gasket begins to soften and lose its pressing force, causing flange leakage.
　　7. Thermal expansion and contraction
Due to the thermal expansion and contraction of the fluid medium, the bolt will expand or contract, so that the gasket will create a gap and the medium will leak through pressure.

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