Heavy oil pump seal oil issue
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The heavy oil pumps in coking units use wax oil as seal oil. What is the function of this seal oil? How is the outlet pressure of the oil sealing pump set? What is the function of the flushing oil, and what is the difference between it and the sealing oil?
Flushing oil is the sealing oil. The function of the seal oil is to carry away the friction heat from the mechanical seal, cool the seal, and lubricate the friction surfaces of the mechanical seal. The outlet pressure of the seal oil pump needs to be determined based on the pressure required in the sealing chamber, as well as the losses in the pipelines of the seal oil system.
The function of sealing oil is primarily to provide sealing, as well as serving purposes such as lubrication. Flushing oil is used to dissolve and wash away the heavy oils present inside the equipment; for example, when cleaning an oil slurry steam generator, it is first flushed with flushing oil and then purged with steam, with diesel being the typical component used in this regard
The most important function of the sealing oil is to improve the conditions under which sealing takes place, preventing particulate-containing media inside the pump from entering the sealing chamber. The sealing oil flows directly through the sealing chamber into the pump. The slurry pump used in catalytic units is a typical example of such a device; it contains a high amount of catalyst. Without the use of sealing oil, solid particles would enter the sealing mechanism, leading to rapid wear of the seals. Additionally, the sealing oil helps to remove a large amount of heat, thereby reducing the operating temperature of the seals.
Ask； Is the mechanical seal of this pump double-end?
A pump that uses seal oil is not necessarily double-end sealed; single-end sealing can also make use of seal oil.
Is it because the diesel pressure is slightly higher than the medium pressure, causing the diesel to directly enter the seal chamber?
If it is a single-face seal, it is just as you described.