The fundamental method to eliminate leaks in the maintenance of sealing components is to increase the pre tightening force of flange bolts and modify or transform the sealing components. The national standard lens pad is easy to disassemble and has a low price. It is usually disposed of by removing the light knife or replacing it with a new one. Regarding national standard pipelines, especially those with larger diameters, it is quite difficult to transform, disassemble, transport, and manufacture them.
Economically speaking, it is not cost-effective to adopt on-site correction methods for disposal. If the sealing surface of the pipe end is partially damaged, the method of spot welding damage first, then repairing and grinding the sealing surface, and stopping coloring or magnetic particle inspection can be used for correction; The majority of leakage reduction methods, such as lens gasket sealing, involve interface leakage.
It occurs on the interface between the sealing spherical surface of the lens gasket and the conical sealing surface of the pipe end, mainly caused by pipeline oscillation, poor installation, medium corrosion, process shaking, and other reasons. We separated the on-site practice based on the revealed cause of the outbreak and adopted effective preventive methods to reduce the oscillation, which is the main reason for the damage to the sealing of the national standard flange lens gasket.
The oscillation of pipelines is mainly caused by factors such as the oscillation of adjacent equipment, the airflow pulsation caused by fluid movement inside the pipeline, and the excitation of pipe fittings (such as elbows and valves). Therefore, in cases where the direction and structural scale of the pipeline cannot be changed due to limitations, the method of stopping reinforcement of the pipeline is mostly chosen, and pipe racks and clamps are added to bends, valves, reducers, and positions with larger spans.
