Cause Analysis of Water Pump Mechanical Seal Leakage

     Water pump failure is one of the mechanical seal leakage fault most prone pump, pump mechanical seal so that also belong to one of the more critical consumable pump components.

       Pump selection of mechanical seal material must be able to transport the liquid medium, usually the pump factory is Viton mechanical seal Some manufacturers are nitrile rubber mechanical seal, if corrosive more serious choice PTFE mechanical seal,

       Steps / methods:

      1, the installation is too tight observe the mechanical and electrical ring seal plane, if serious burning phenomenon, the plane black and deep marks, seal rubber hardened, loss of elasticity. This phenomenon is caused by the installation is too tight. Approach: Adjust the installation height, the impeller installed, use a screwdriver to pull the spring, the spring has a strong tension, release after reset, 2-4 mm of the moving distance can be.

      2, the mechanical seal at the first possible leakage of mechanical seal, static plane wear, and seal the movement, static plane wear for six reasons.

      3 installed to send. Observer seal, static ring plane, the surface has a thin layer of scale, to wipe the surface of the basic wear and tear, which is caused by the loss of spring flexibility and poor assembly, or motor caused by the axial movement.

       4, poor water quality with particles. Due to poor water quality, containing small particles and high chloride content in the medium, the formation of abrasive wear seal plane or surface of the groove to produce grooves and other phenomena. Approach: improve water pressure or medium, replace the machine seal.

      5, cavitation. Cavitation is mainly caused by hot water pump. As the medium is hot water, the water temperature is too high to produce steam, the gas inside the pipe into the pump chamber height, this part of the gas can not be excluded, resulting in water running, machine seal dry failure, cavitation with automatic exhaust valve , Change machine seal.

      6, running dry water damage caused by lack of water. This phenomenon is more common at the end of the valve installation form the entrance of negative pressure, air inlet pipe, the pump cavity air, the pump boot, machine seals friction high speed operation produces high temperature, can not be cooled, check the machine seal, spring tension normal , The friction surface burns black, the rubber hardens and cracks. Disposal of exhaust piping and pump chamber air, replace the machine seal.

      Cause 3. The liquid contains particles
　　
Inspection methods: to understand the liquid situation (with or without debris sediment, etc.). Remove the pump inspection, inspection and inspection mechanical seal damage.
　　
State characteristics: pump seal cavity with debris, or sediment or welding slag and so on. Machine seal damage (liquid tube damage or static ring, ring friction surface wear).
　　
Treatment: pump chamber and seal cavity debris, welding slag or sediment, etc., will result in machine seal damage, must be replaced machine seal.
　　
Reason 4. The wrong type of selection (not according to the requirements of the use of suitable conditions for the use of mechanical seal, especially the transport of corrosive liquid environment).
　　
Inspection method: Learn more about pumping liquid composition, temperature, corrosivity. Remove the pump inspection, inspection and inspection mechanical seal damage.
　　
State characteristics: Wave tube seals and other deformation, deterioration or melting. Moving, static friction surface may have spent grinding (especially the use of a long time, short time may not be spent).
　　
Approach: According to the liquid temperature, composition, corrosive re-select the conditions for the use of mechanical seal.

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