Causes of centrifugal pump leakage
The reasons for centrifugal pump leakage can be analyzed from multiple aspects, mainly including sealing problems, pump structure problems, changes in working conditions, and improper operation and maintenance. The following is a specific summary of these reasons:
1. Sealing problems
Improper use of sealing rings:
The material, size, installation and other factors of the sealing ring will affect its sealing performance. If the inappropriate material is selected, the installation is improper, or the sealing ring itself is damaged and worn, it will cause leakage.
Mechanical seal damage:
Mechanical seals are a commonly used sealing method, but during use, they will cause leakage due to material wear, improper spring adjustment and other reasons. At this time, the mechanical seal needs to be replaced or repaired and maintained.
Packing seal aging:
Packing seals are another common sealing method, but during use, they will cause leakage due to problems such as aging of packing and loose glands. The packing needs to be replaced in time and tightened.
2. Pump body structure problem
Poor pump body structure design:
The pump body structure is related to parameters such as back pressure and flow rate. If the pump body structure is improperly designed, such as unreasonable design of the pump body cavity causing excessive medium resistance, improper pump body processing causing rough sealing surface, etc., leakage will occur.
Poor pump body processing quality:
Whether the internal burrs, pores, convex and concave surface defects are handled well during the pump body processing, and whether the accuracy of the internal sealing surface is strictly controlled is also a key factor affecting the leakage problem.
3. Changes in working conditions
Excessive temperature changes:
During the operation of the centrifugal pump, due to factors such as transmission power and fluid compensation, the temperature at the seal will also change to varying degrees. For some sealing materials whose material properties are greatly affected by temperature, leakage problems will occur.
Changes in working conditions:
Large changes in working conditions, such as vacuuming, cavitation or long-term pressure holding, may cause seal damage, which in turn causes leakage.
4. Improper operation and maintenance
Improper operation:
During the operation of the centrifugal pump, if the pump is not started and stopped according to regulations, the system pressure and temperature are too high, etc., which will have an adverse effect on the service life and sealing effect of the seal, and then cause leakage problems in the pump body.
Improper maintenance:
When restarting after a long period of shutdown, there is no manual cranking, and the friction pair is torn due to adhesion and the sealing surface is damaged; or the maintenance of the pump is not timely and thorough, which will also cause leakage problems.
