Countermeasures for leakage maintenance 1. For the countermeasure of bad movement, the o-ring with good wear resistance and good rubber elasticity is used first. This o-ring can keep its original shape and size and keep the sealing function when slight damage occurs. The o-ring used for sealing is usually rubber or polytetrafluoroethylene. The polytetrafluoroethylene is primarily corrosive and can be used as a corrugated gasket or as a v-shaped tube. If in high or low temperature conditions, the general choice of stainless steel and other materials as a bellows seal ring, if the rotating type of mechanical seal, seal ring to use the o-ring sliding seal. We may consider using a long-life static mechanical seal, in which the static ring is mounted on one side of the shaft and the dynamic ring is mounted on the other side of the casing, so as not to affect the device due to mechanical deformation, at the same time, it also has a good maintenance function for the structure of flatness. At the same time, the installation method does not contact with the sealing fluid, and the movement of the spring is greatly improved, which provides great convenience in cleaning the slurry, keeping the flatness of the seal and the precision of the machine. The mechanical seal is also very big because of the influence caused by the heat, the heat will cause the material denaturation and the part distortion, will cause the load ability to change, thus greatly reduced the seal working performance and has been burnt the situation. The treatment method needs to pass the size of heat depending on the situation, including natural cooling, Inner Circulation Cooling, Outer Flushing Cooling and inner circulation cooling, and control the temperature of the seal to achieve the best sealing effect. 2. For the sliding surface of the countermeasures in equipment maintenance and repair, carefully check whether the equipment wear and sliding mark phenomenon, to ensure the accuracy of the static ring surface. At the same time, the static mechanical seal can solve the problem of wear and tear. Another way to solve the problem of thermal deformation is to change the holding mode of o-ring or graphite ring from sliding mode to inserting mode. 3. Countermeasures against dry sliding if the sliding surface is damaged due to insufficient cooling when the sliding heat is generated, we can choose to configure a more complete seal fluid and cooling water and temperature control unit, at the same time also need to supply the pipeline for the inspection tour, to prevent the occurrence of blockage. When selecting mechanical seal, it is best to use static mechanical seal with good slurry resistance, which can better prevent dry friction. In addition, it is very important to strengthen the running management of rotating machinery, check the pressure of mechanical seal and other parameters and states, and solve the related problems in time. In conclusion, the leakage of chemical mechanical seal is a very important problem, which directly affects the safety of the whole chemical production. Once the leakage occurs, it is likely to cause a major accident. Therefore, we need to focus on the mechanical seal on the issue of research, research out a better maintenance and prevention policy.