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Analysis Of Causes Of Leakage Of Slurry Pump Mechanical Seal

Released on Oct. 12, 2018

The mechanical seal itself is a highly demanding precision component, which has high requirements for design, machining and assembly quality. The mechanical seal of the slurry pump has a low leakage relative to the packing and the dynamic seal, but the mechanical seal also causes leakage. What is the cause of the leakage of the mechanical seal of the Slurry Pumps, and what is the treatment method, which Slurry Pump Manufacturer will be explained in detail today. 

Common leakage

Mechanical seal leakage accounts for more than 60% of all maintenance conditions. The operation of mechanical seals directly affects the normal operation of horizontal slurry pumps. The summary analysis is as follows.

Periodic leakage.

(1) The axial displacement of the pump rotor is large, the interference between the auxiliary seal and the shaft is large, and the moving ring cannot move flexibly on the shaft. After the pump is turned over, the moving and static rings are worn, the compensation displacement is not obtained.

Countermeasure: When assembling the mechanical seal, the axial yaw of the shaft should be less than 0.1mm, and the interference between the auxiliary seal and the shaft should be moderate. While ensuring the radial seal, the moving ring can be flexibly moved on the shaft after assembly ( Pressing the moving ring against the spring can bounce back freely).

(2) Insufficient amount of lubricating oil on the sealing surface causes dry friction or brushed end faces.

Countermeasure: The height of the lubricating oil surface in the oil chamber cavity should be added to the upper and lower sealing surfaces.

(3) The rotor periodically vibrates. The reason is that the stator is not centered with the upper and lower end caps or the impeller and the main shaft are unbalanced, cavitation or bearing damage (wear), which shortens the seal life and creates leakage.

Countermeasures: The above problems can be corrected according to the maintenance standards.

Slurry Pumps

Boye Dinghe Road Urban Sector,Baoding,Hebei 071300, China
+86 312 8306 113
+86 312 8327 015
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