What Are The Causes Of Flange Leakage

Flange leakage is commonly caused by the following 7 reasons:

1. The wide mouth

Deflection, refers to the pipe and flange is not vertical, different center, flange surface is not parallel. Flange leakage occurs when the pressure of the internal medium exceeds the load pressure of the gasket. This situation is mainly caused in the process of installation and construction or maintenance, which is easy to be found. As long as the real inspection at the completion of the project, the occurrence of such accidents can be avoided.

2. Wrong

Wrong mouth, refers to the pipe and flange vertical, but the two flanges different center. The flange has different cores, resulting in the surrounding bolts can not be freely penetrated into the bolt hole. In the absence of other options, reaming or inserting a smaller bolt into the bolt hole will reduce the tension of both flanges. In addition, the sealing surface of the sealing surface line is also biased, so it is very easy to leak.

3. The open mouth

Opening, refers to the flange gap is too large. When the gap of flange is too large and causes external load, such as axial or bending load, the gasket will be impacted or shaken, lose compression force, and gradually lose sealing kinetic energy, resulting in failure.

4. The wrong hole

Wrong hole, refers to the pipe and flange concentric, but the distance between the two flange opposite the bolt hole deviation is large. The wrong hole will make the bolt produce stress, the force is not eliminated, will cause shear force on the bolt, a long time will cut off the bolt, resulting in seal failure.

5. Stress effect

When the flange is installed, the joint of the two flanges is relatively standard, but in the system production, after the pipeline enters the medium, the temperature of the pipeline will change, so that the pipeline will expand or deform, so that the flange will be subjected to bending load or shear force, which is easy to cause gasket failure.

6. Corrosion effect

Because of the corrosive medium to the gasket erosion for a long time, so that the gasket chemical changes. The corrosive medium penetrates into the gasket, and the gasket becomes soft and loses its compression force, resulting in flange leakage.

7. Heat expands and cold shrinks

Due to the thermal expansion and cold contraction of the fluid medium, the bolt expands or contracts, so that the gasket will produce a gap, and the medium leaks through the pressure.

There are many reasons for flange leakage, which will not be described here.

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