The cause and management of ship's host shaft oil method?

The cause and management of ship's host shaft oil method? 2020 - 12 - 01 ship host shaft oil spill on board is not happen very often, but once it has, the ship will get in trouble, trouble shipping transportation safety production; Cause port and Marine pollution at the same time, make the ship by huge fines or even being stranded, even causing unplanned Daniel was forced into the dock repair, to serious economic losses from the shipowners and shipping date. Cause of shaft leakage, ship's host of stern shaft sealing leakage reason mainly has the following two kinds: one is the tail shaft with foreign body. The second is due to the collision of the propeller shaft seal deformation and leak. Stern tube oil leakage treatment measure 1, close the high shaft oil gravity oil tank outlet valve, open shaft lub oil low gravity oil tank outlet valve ( If applicable) ； No low gravity oil tank, can discharge part oil, cut the oil level of gravity tank. 2, select a lower position is easy to install stern lubricating oil gravity, oil tank in closed original higher position of shaft oil gravity oil tank outlet valve. To reduce the original gravity static pressure tank; By adjusting the temporary gravity the height of the oil tank, the control of the spill and try not to make the water leakage. 3, take the instillation, is in the tail axle load force on ark plus a barrels of oil, barrels and add a small valve, every quantitative drip into the shaft. 4, in use, or add lubricating oil of high viscosity. 5, as far as possible make the ship stern, increase the propeller of the draft. 6, anchorage or berth shut down when gravity oil tank outlet valve, reduce the tail shaft oil pressure of the system. 7, according to some oil company, recommend the use of additives lubricating oil and oil/water emulsion lubrication stern tube, such as using VICKERS, British company HYDROX series special lubricating oil, the oil after joining aqueous shaft oil can form a stable emulsion, to ensure that lubrication and reduce leakage to prevent corrosion, the stability of the emulsion was recognized as virus-free to Marine life. 8, are leaking air defence method: gravity tank generally about nearly 10 meters high from the tail shaft, normal cases, gravity oil tank to the tail shaft sleeve tube piping and tail shaft sleeve pipe is the same system, is also a relative in a sealed condition. Tail axle load force oil tank is a compensation oil. And when there is deformation of stern shaft sealing, relative seal is damaged, gravity tank in high differential pressure under the action of the oil pressure, this water will enter the tail shaft sleeve tube, slightly a little bit serious can cause oil leakage. In this case, the only restore the tail shaft sleeve pipe and the gravity tank is a relative within the oil seal, to reduce or stop the tail shaft oil leakage. Gravity oil tank of air holes to block not breathe freely, to the gravity tank filled with oil filler to block, after in this state, when the oil level of contained in the low to a certain value, must cause a vacuum degree and the whole system, and the vacuum degree can absorb oil in the system where it or at least reduce the amount of leakage. This is leaking air defence method is more effective in practice. 9, as soon as possible arrange shipping dock repair, replace or repair the sealing device in a timely manner. （ Source: the MTF of maritime technical meeting)