Mechanical Seal Operation and Maintenance
Mechanical Seal Preparations Before Starting
Comprehensively check whether the mechanical seal, as well as the installation of accessories and pipelines are complete and meet the technical requirements.
Before starting the mechanical seal, perform a static pressure test to check whether the mechanical seal is leaking. If there are too many leaks, the cause should be found out and tried to eliminate. If it is still invalid, it should be disassembled, checked and re-installed. The general static pressure test pressure is 2~3 kg/cm2.
Rotate the pump according to it’s rotation direction to check whether pump is brisk and even. If pump is difficult or does not move, check whether the assembly size is wrong and whether the installation is reasonable.
Installation and Shutdown
Keep the seal chamber full of liquid before starting. When conveying solidified media, the sealed cavity should be heated with steam to melt the media.
Rotate the pump before starting to prevent the soft ring from breaking due to sudden start.
For mechanical seals that utilize the oil sealing system outside the pump, the oil sealing system should be activated first. Finally stop the oil sealing system after shut down. After the hot oil pump is out of operation, the cooling water in the sealing oil cavity and the end face seal cannot be stopped immediately. The cooling water can only be stopped when the oil temperature at the end face seal drops below 80 degrees, so as to avoid damage to the sealing parts.
If there is a slight leakage after the pump is started, observe it for a period of time. If the leakage is still not reduced after continuous operation for 4 hours, the pump should be stopped for inspection.
The operating pressure of the pump should be stable, and the pressure fluctuation should not be more than 1 kg/cm2.
During the operation of the pump, the evacuation should be avoided to avoid dry friction of the sealing surface and seal damage.
The seal should be checked frequently.
During operation, when the leakage exceeds the standard (the heavy oil is not more than 5 drops/min, and the light oil is not more than 10/min), if there is no improvement within 2-3 days, the pump should be stopped to check the sealing device.