How should the pressure of a cascade mechanical seal be set?
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http://www.tjtongchang.cn/upload/proPics/128940377506438059.jpg Currently, some of the pumps in this facility use cascade mechanical seals, but numerous problems have arisen during their operation. According to the parameters provided by the manufacturer, the pressures for the three pumps are 0.32, 0.35, and 0.42 respectively. However, when adjusting the discharge pressure, it was found that even when the nitrogen pressure was set to the lowest value possible (nitrogen is necessary to protect against hydrogen sulfide in the discharged gas), the liquid level in the sealing tank still decreased to varying degrees when the pressure was adjusted to 0.32–0.25. I would like to ask how others adjust this pressure
If hydrogen sulfide is present in the emitted gases, it indicates a leak in the medium; in such cases, the pressure of the sealing fluid can be increased. If the level of this sealing fluid drops too rapidly, it means the seal has failed and repair is necessary. It is normal to top up the fluid every half month.