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Mechanical Seal Maintenance Issues
May 24, 2018

Mechanical seal maintenance issues

Preparation before running mechanical seals

1. Completely inspect the mechanical seal, and whether the attachments and pipelines are fully installed and meet the technical requirements.

2. Before the start of the mechanical seal, conduct static pressure test and check whether the mechanical seal has leakage. If there are more leaks, you should find out the reasons and try to eliminate them. If it is still invalid, it should be dismantled and reinstalled. General static pressure test pressure with 2 ~ 3 kg / square centimeter.

3, press the pump to turn the car, check whether light and uniform. If the bicycle is difficult or not moving, you should check whether the assembly size is wrong and whether the installation is reasonable.

Mechanical seal installation.jpg

Mechanical seal installation and outage

1. Keep the sealed cavity full of liquid before starting. For conveying a solidified medium, steam is applied to heat the sealed chamber to melt the medium. Before start-up, it is necessary to start the car to prevent the soft ring from cracking due to sudden start-up.

2. For the mechanical seal using the pump sealing system, start the sealing system first. Stop the oil seal system after parking.

3, after the shutdown of the hot oil pump can not stop sealing oil cooling cavity and the end face of the cooling water should be until the oil temperature at the end of the seal down to 80 degrees below, before they can stop the cooling water, so as not to damage the sealing parts.

Mechanical seal under operation

1. If there is a slight leakage after starting the pump, observe for a while. If continuous operation for 4 hours does not reduce the leakage, pump inspection should be stopped.

2. The operating pressure of the pump should be stable and the pressure fluctuation should not exceed 1 kg/cm2.

3, pump in operation, should avoid the phenomenon of evacuation, so as to avoid sealing surface dry friction and seal damage.

3, seals should always check. During operation, when the leakage exceeds the standard, the heavy oil is no more than 5 drops/minute, and the light oil is no more than 10 drops/minute. If there is still no trend of improvement within 2-3 days, the pump should be stopped to check the sealing device.