High-speed pump mechanical seal leakage
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High-speed pump: the gearbox has an input shaft, an intermediate shaft, and an output shaft. The medium is olefin; after the machine is started, the pressure in the sealed white oil tank reaches 2.5 kilograms. Olefin gas can be seen coming out of the fueling port of the gearbox, and the lubricating oil is also carried away by this olefin gas. There is no white oil at the seal leakage inspection port; fellow sailors, what do you think could be the reason?
Check whether the pressure gauge is indicating accurately. The mechanical seal has one dynamic sealing point and two static sealing points. For reference.
From the observations, there are leaks on both the medium side and the oil testing machine seal; check whether the vent line of the sealing tank is blocked or not providing any pressure relief.
It’s a Taixin pump; this is the situation whenever the pump is started. Even after replacing the sealing material and the mechanical seal, the same problem persists. The sealed tank is under a pressure of 2.5 kilograms, which confirms that the leak is caused by the first sealing machine; the problem is that there is still gas escaping from the gearbox as well.
In the case of a 53B sealing scheme, the pressure in the white oil tank should be 0.2–0.5 Kg higher than the pressure of the medium; nitrogen is used to apply this pressure. A pressure of 2.5 Kg does not indicate any leakage in the mechanical seal on the medium side, as long as the pressure does not rise sharply, then there is no problem with the mechanical seal； If there is fluid in the gearbox, check whether the O-rings of the shaft sleeves and other components are properly sealed
The sealed tank does not have a nitrogen tank; the pump is operating normally and there is no pressure in the sealed tank. If there is a problem with the shaft sleeve O-ring, then white grease should drip from the leak detection port or the medium should come out of it. After starting the pump, no abnormalities were found at the leak detection port.