Analysis of mechanical seal leakage of water pump

Analysis on the reason of water pump mechanical seal leakage:
Core tip: water pump mechanical seal leakage fault is one of the most prone to failure of the pump, so the pump mechanical seal is also part of the more critical parts of the pump vulnerable parts.
Pump selection of mechanical seal material must be suitable for liquid medium conveying pump factory, usually are some manufacturers is fluorine rubber mechanical seal NBR mechanical seal, if serious corrosive must choose the PTFE material mechanical seal,
Steps / methods:
1, the installation of mechanical seal tight observation of dynamic and static ring plane, such as severe burning phenomenon, the plane black and deep traces, sealing rubber hardens, loss of elasticity. This phenomenon is due to the installation caused by tight. Solution: adjust mounting height, impeller after installation, use a screwdriver to toggle the spring, there is a strong tension spring, after the reset release, mobile distance to 2-4 mm.
2, mechanical seal leakage of the first kind may be mechanical seal of the dynamic, static ring plane wear and tear, and caused the mechanical seal of the dynamic, static ring plane wear for six reasons.
3 installed over send. To observe the mechanical seal of dynamic and static ring plane, its surface has a thin layer of the scale, be able to wipe the surface, no wear, this is the loss of flexibility and spring assembly caused by bad or axial movement caused by motor.
4, the water quality is poor. Due to poor water quality, containing small particles and medium hydrochloride content high, formation of abrasive wear of the mechanical seal of the plane or surface of the groove of the ring strain ditch phenomenon. Treatment: to improve the water pressure or media, the replacement of mechanical seals.
5, cavitation. Cavitation is mainly produced in hot water pump. The medium is water, the water temperature is too high to produce steam, gas pipeline into the high pump cavity, this part of the gas can not be excluded, resulting in running water, dry grinding machine seal failure, cavitation automatic exhaust valve, replace seal.
6, water shortages caused by running dry mill damage. This phenomenon is more common in valve mounted form inlet pressure, inlet air, air cavity pump, pump boot, high temperature operation of the mechanical seal friction at high speed, can not be cooled, check sealing machine, spring tension, friction surface charred black, rubber hard crack. Treatment methods to exhaust pipe and pump cavity air, the replacement of mechanical seals.
Reason 3 liquid containing particles
Inspection methods: to understand the situation of the liquid (with no debris, such as sand and silt, etc.). Check the pump, observe and inspect the mechanical seal.
Status features: pump seal cavity with debris, or sediment or slag, etc.. Machine sealing damage (liquid pipe damage or static ring, dynamic ring friction surface wear).
Treatment methods: the pump cavity and the sealing cavity with debris, welding slag or sand, etc., will cause damage to the machine, the machine must be replaced.
4 reasons for the selection of the wrong (not in accordance with the requirements of the use of the use of suitable for the use of the machine seal, especially the use of corrosive liquid transport environment).
Inspection methods: a detailed understanding of liquid composition, temperature, corrosion resistance. Check the pump, observe and inspect the mechanical seal.
State characteristic: the deformation, metamorphism and melting of the seal such as the wave grade pipe. Dynamic and static ring friction surface may be grinding flowers (especially the use of a long time, time is not necessarily a short time to wear).
Processing method: according to the temperature of the liquid, the composition, the corrosion to select the suitable condition of the machine seal.