What should I do if the flange leaks?
National standard flanges occasionally leak during use, so if this happens, see what method can properly reduce the occurrence of this situation.
1. Leak elimination method
The basic way to repair the sealing element to eliminate leakage is to increase the pre-tightening force of the flange bolts, and to modify or change the sealing element. The national standard lens pad is easy to disassemble and the price is low. Generally, the method of dismantling the light knife or replacing it with a new one is used. For national standard pipelines, especially those with larger diameters, it is difficult to transform, disassemble, transship and manufacture, and it is not economically cost-effective. It is advisable to adopt the method of on-site correction. If the sealing surface of the pipe end is partially damaged, it can be corrected by spot welding the damaged part first, then grinding the sealing surface and carrying out coloring or magnetic particle inspection;
Second, the leakage reduction method
The majority of lens pad seal leakage is interface leakage, which occurs at the interface between the lens pad sealing spherical surface and the pipe end conical sealing surface, mainly caused by pipeline vibration, poor installation, medium corrosion, process fluctuations, etc. We have taken effective preventive measures based on the cause of the leakage and combined with the actual situation on site.
Oscillation reduction Oscillation is the main cause of damage to the national standard flange lens gasket seal. The vibration of the pipeline is mainly caused by the vibration of adjacent equipment, the air flow pulsation caused by the flow of fluid in the pipeline, and the excitation of pipe fittings (such as elbows and valves). Therefore, when the direction of the pipeline and the structural scale cannot be changed due to conditional constraints, most of the methods of strengthening the pipeline are adopted, and pipe brackets and pipe clamps are added to the bends, valves, reducing joints and positions with large spans. ;Repair the welding seam of the pipe frame separated from the pre-embedded iron in the foundation, and reinforce the original pipe frame with angle steel or channel steel to improve its rigidity loose.