Regarding the pressure issue of the flushing oil
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During the operation of centrifugal pumps, a flushing oil circulation system is generally installed at the mechanical seal to cool it. However, the pressure of the flushing oil in many of our company’s centrifugal pumps varies; in some cases it is zero, while in others it is around 3 kilograms per square centimeter. How exactly should this pressure be defined, or what level should it be kept at?
It is related to both the type of mechanical seal and the medium pressure
The mechanical seal is a single-face seal – an internal-type rotating mechanical seal. Its flushing oil pressure should be related to the pressure in the sealing chamber; it shouldn’t be greatly affected by the pressure of the working medium, right? Do you mean the medium pressure at the outlet or the inlet?
It is related to the sealing type of the pump; generally, it is higher than the pump outlet pressure； This pressure and flushing volume are generally calculated by pump manufacturers
It is generally impossible for it to be higher than the pump outlet pressure; in our company, when the pump outlet pressure is in the range of several dozen kilograms, the pressure of the flushing oil is only three or four kilograms.
Based on experience, the flushing pressure is generally set at an inlet pressure of 0.1 MPa