Leakage problem of mechanical seal in gear pump and auxiliary seal

[1] Mechanical seal leakage problem of gear oil pump

(1) Pump mechanical seal leakage problem during the construction period of chemical equipment

During the construction stage of petrochemical equipment, there are problems such as poor external construction environment, inadequate product protection, and long construction period. Mechanical seal leakage may occur during pump installation, single machine debugging, and material debugging stages.

. During the pump installation stage, if the construction is not done properly and the protection of the finished product is not in place, the construction waste will enter the sealing end face from the pump inlet and outlet, which will cause wear on the sealing surface and lead to sealing leakage; During the pump debugging stage, impurities may enter the sealing end face due to incomplete flushing of the pipeline, causing wear and leakage of the dynamic and static rings; If the pump is left unused for a long time, it may cause aging of the sealing ring, inadequate sealing, and lead to leakage of the machine seal

(2) Mechanical sealing problems of pumps in the production stage of chemical products

1) External cracking of gear oil pumps

If uneven stress occurs during the operation of gear oil pumps in petroleum production, it will cause external cracking of gear oil pumps. The detection of this problem requires force analysis of gear oil pumps. However, in different periods and operating conditions, the degree of external force acting on gear oil pumps varies, making the probability of force analysis of gear oil pumps and increasing the difficulty of crack detection.

2) External corrosion of gear oil pump

The working environment of gear oil pump in petrochemical production will be corroded by external substances, and there are various types of petrochemical substances. In the actual material selection of chemical pump design, if the corrosiveness of the construction materials of gear oil pump cannot be grasped, it will cause serious corrosion damage to the external of gear oil pump and leakage phenomenon.

[2] Arc pump auxiliary sealing

The development and progress of technology have greatly improved the level of various technologies, promoting the development of the industry and social progress.

. As an important economic development industry structure in China, the chemical industry faces many problems in its normal operation, which require technological improvements. From the current actual situation of chemical industry, there is a large amount of fluid in its production. Due to its own characteristics, the entire production environment will have a serious impact on personnel. Therefore, in actual control, it is necessary to strengthen the treatment of mechanical seals to prevent the occurrence of fluid leakage problems

In order to improve its sealing performance, in specific work, it is necessary to select some substances for auxiliary sealing treatment according to the actual work needs. Currently, the following two auxiliary sealing materials are mainly used:

(1) synthetic rubber. The main function of synthetic rubber is that it can be made into rubber sealing rings to reinforce the entire structural part. The application range of using different sealing ring materials varies greatly. For example, using nitrile rubber material can be applied to fluid media such as mineral oil or animal and vegetable oil. It has strong performance and can meet the needs of normal use, which has a direct impact on the operation of the system

(2) Polytetrafluoroethylene. Although this material is widely used in chemical sealing treatment, the rubber ring sealing material made of polytetrafluoroethylene material has a relatively high coefficient of expansion and poor elasticity. Therefore, it is necessary to choose and use it according to the actual situation to meet the needs of use, otherwise it is prone to damage and poor sealing, leading to significant losses