Normal operation and maintenance of mechanical seals

1. Preparation and precautions before startup

1.1. Conduct a comprehensive inspection of the mechanical seal, as well as whether the installation of auxiliary devices and pipelines is complete and meets technical requirements.

1.2. Conduct a static pressure test before starting the mechanical seal to check for any leakage. If there are many leaks, the cause should be investigated and efforts should be made to eliminate them. If it is still ineffective, it should be disassembled, inspected, and reinstalled. The general static pressure test pressure is 2-3 kilograms per square centimeter.

1.3 Rotate the pump towards the turning wheel and check if it is light and even. If the turning gear is difficult or stationary, the assembly dimensions should be checked for errors and the installation should be reasonable.

2. Installation and shutdown

2.1 Before starting, the sealed chamber should be filled with liquid. When transporting solidified media, steam should be used to heat the sealed chamber and melt the media. Before starting, it is necessary to turn the car to prevent sudden starting from causing the soft ring to break.

2.2. For mechanical seals that utilize the pump's external sealing oil system, the sealing oil system should be started first. Stop the oil sealing system after parking.

2.3 After the hot oil pump is shut down, the cooling water for the sealing chamber and end face seal should not be stopped immediately. The cooling water should only be stopped when the oil temperature at the end face seal drops below 80 degrees to avoid damaging the sealing parts.

3、 Operation

If there is a slight leakage after the pump is started, it should be observed for a period of time. If the leakage does not decrease after running continuously for 4 hours, the pump should be stopped for inspection.

3.2 The operating pressure of the pump should be stable, with pressure fluctuations not exceeding 1 kilogram per square centimeter.

During the operation of the pump, it is necessary to avoid the occurrence of vacuum pumping to prevent dry friction and seal damage on the sealing surface.

3.4 The sealing condition should be checked regularly. During operation, when the leakage exceeds the standard, the heavy oil should not exceed 5 drops/minute and the light oil should not exceed 10 drops/minute. If there is still no improvement trend within 2-3 days, the pump plug should be stopped to check the sealing device.