What is the cause of flange leakage?

What is the cause of flange leakage? French factory staff summarized the following seven leakage reasons, hoping to help friends in need.
1, flange leakage reason: wrong mouth
A staggered joint is where the pipe and flange are perpendicular, but the two flanges are not concentric. The flange is not concentric, so the surrounding bolts cannot pass freely through the bolt hole. In the absence of any other means, reaming or small bolts can be screwed into the bolt holes, which reduces tension on both flanges. Moreover, the sealing surface of the sealing surface is also biased, which is very easy to leak.
2, flange leakage reasons: corrosion effect
Because the gasket has been corroded by the corrosive medium for a long time, the gasket has undergone chemical changes. The corrosive medium penetrates into the gasket, which begins to soften and lose compression, causing the flange to leak.
3, flange leakage causes: bias
Deflection refers to the pipe and flange are not vertical, different center, flange surface is not parallel. Flange leakage occurs when the internal medium pressure exceeds the load pressure of the gasket. This condition is mainly caused by installation or maintenance and is easier to spot. As long as the actual inspection is completed, the accident can be avoided.

4, flange leakage causes: mouth opening
Opening refers to the flange gap is too large. When the flange clearance is too large and causes external loads (such as axial or bending loads), the gasket will be impacted or vibrated, losing its compression force and gradually losing the kinetic energy of the seal, resulting in failure.
5, flange leakage causes: pressure action
When installing flanges, the joint of two flanges is more standard, but in system production, after the pipe enters the medium, the temperature of the pipe will change, resulting in expansion or deformation of the pipe, so that the flange becomes subjected to bending load or shear force, which can easily lead to gasket failure.
6, flange leakage reason: wrong hole
The wrong hole indicates that the pipe is concentric with the flange, but the distance between the two bolts is large relative to the bolt hole. The wrong hole will cause the bolt to stress and will not remove the force. This will create shear forces on the bolt and the bolt will be disconnected for a long time, resulting in seal failure.
7. Flange leakage causes: thermal expansion and cold contraction
The bolt expands or contracts due to the thermal expansion and contraction of the fluid medium, so the gasket will create a gap, and the medium will leak through pressure.
The above seven points are the common reasons for flange leakage. If you need to know more about flange and elbow or order flange elbow, you can consult us. We look forward to cooperating with you.