Causes of flange gasket failure-temperature changes and cooling

Causes of flange gasket failure-temperature changes and cooling

Temperature changes and cooling also have a great influence on the sealing effect. The pipes are installed at room temperature. When heated, the pipe expands and compresses. The pipe shrinks when the temperature drops. Leaks often occur during the cooling process of flange joints. After cooling, the compression force, stress relaxation of the gasket and cooling shrinkage of the pipe will change, resulting in tension in the bolt direction, resulting in leakage.

The reason for the failure of flange gasket-the surface of the sealing surface

During the installation process, attention should be paid to the surface condition of the sealing surface, and the surface roughness of the sealing surface must be the same as the shape of the sealing surface.

Causes of flange gasket failure-stress relaxation and torque loss

Stress relaxation and torque loss are also the main causes of leakage. After the bolts are tightened on the flange due to mechanical vibration and temperature rise or fall, the gasket will experience stress relaxation during the working process, and the bolt torque will gradually decrease, resulting in torque loss and leakage. Generally speaking, the longer the bolt length, the greater the residual torque and the smaller the diameter. This will help prevent torque loss. Therefore, the use of slender bolts is an effective way to prevent torque loss. In addition, the greater the temperature change and the longer the duration, the greater the torque loss. By heating the bolt for a period of time to extend it, and then maintain the given torque, the loss of torque can be effectively prevented. The thinner the washer, the smaller the torque loss. In addition, preventing the strong vibration of the machine and the pipeline itself and eliminating the influence of adjacent equipment vibration has no significant impact on the sealing surface, and can prevent torque loss without the need for bolt tapping.

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