Requirements for mechanical seal lubricant
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I wonder what requirements there are regarding the quality of the sealing fluid for mechanical seals that people usually use Such as various ion contents, impurity levels, etc.?
The viscosity of the mechanical seal fluid should not be too high, and the temperature of the seal fluid must also not be too high; otherwise, the sealing ring is prone to aging. One of our centrifugal pumps experienced leakage problems frequently due to the excessively high temperature of the seal fluid, which was around 110 degrees. By installing a small heat exchanger in the seal water circuit to lower the temperature of the seal water, the problem was basically resolved
First, it depends on the pumping medium, and then on the parameters.
Is what the poster is referring to the pump flushing fluid? If not, could the original poster first explain what sealant is used for? What’s the purpose of it? If it is just an external flushing fluid, then it should be compatible with the properties of the pumping medium; of course, the fewer impurities there are, the better, and the temperature should not be too high or too low.
It is required to be softened water or process water; the corresponding specifications can be found by making appropriate inquiries.
In pumps equipped with mechanical seals, the medium must be free of impurities, as such impurities can damage the sealing surfaces of the mechanical seal. If the temperature is high, external water cooling can be used to protect the machine’s seals
First, consider the medium; second, the temperature; third, the amount of solid particles.
Apart from the rotating and stationary rings, machine seals are generally made of stainless steel; therefore, when water is used as the sealing fluid, there are restrictions on its chloride ion content, which should generally be below 10 mg/l – the lower, the better. The pH value should be neutral.