How can I determine the pressure and flow rate of the seal water for a mechanical seal?
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How can I determine the pressure and flow rate of the seal water for a mechanical seal?
In my opinion, the pressure of the sealing water should be greater than or equal to the outlet pressure of the pump; otherwise, backflow will occur.
Please confirm in accordance with the provisions in API682.
The pressure of the sealing water should be 1-2 kilograms higher than the pressure in the mechanical seal chamber
The seal fluid pressure must be higher than the pump inlet pressure; otherwise backflow will occur. I’m not familiar with API682, but there is a standard regarding flow rate: for a seal that fits a certain shaft journal, there is a specified range for the seal flushing flow rate. For example, for a seal with a diameter of 65 mm, the flushing flow rate is approximately 6–8 L/m; there are other values as well, which I’ve forgotten...
The pressure of the sealing water must be higher than the pump inlet pressure; otherwise, sealing will not be achieved
The pressure of the sealing water is determined based on the selected flushing scheme; for specific details, refer to the instructions in API682 regarding flushing schemes. This value is not fixed – for schemes such as 32, 53, and 54, it should be 0.5 ar or 10% higher than the pressure of the medium in the sealing chamber； For scheme 52, it is required to be below the medium pressure, usually only slightly above atmospheric pressure, etc