In English

Läckage av propellerhylsolja till den marina miljön

Leakage of stern tube oil into the marine environment

Mikael Persson ; Hugo Sandqvist
Göteborg : Chalmers tekniska högskola, 2015. 29 s.
[Examensarbete på grundnivå]

Propeller shafts onboard ships are lubricated by stern tube oil. This oil frequently leaks into the sea because the seals, between the water and the oil, deteriorate. The volume of oil that leaks varies, from small leaks of a few liters, to more sizeable leaks of up to 150 liters per day. The scope of this problem is larger than one might believe, because even if the leak is small it can occur for a long period of time. Leakage of stern tube oil can cause damage to organisms in the marine environment. The toxic components in the oil can harm the reproduction process of marine organisms. This type of leak is not regulated by MARPOL annex I, which regulates leakage of oils. In The United States this is regulated by additional law. The purpose of this study was to examine the extent of the problem, leakage of stern tube oil. The study examines the frequency and size of stern tube oil leaks, and what factors contribute to the occurrence of leaks, as well as what can be done to avoid leaks. The result of the interviews that were performed in the study was that leakage of stern tube oil is a widespread and frequently occurring problem in shipping. The main cause of leaks was the fishing lines and mud caused damage to the stern tube seals. The seal can also be damaged because of high loads on the propeller shaft, or because the oil used in the stern tube is incompatible with the seal material. Leakage can be avoided by using modern seals. Another way to avoid the problem is the option to convert to water lubricated stern tube.

Nyckelord: Propellerhylsolja, läckage, propellerhylsa, propelleraxel, axeltätning, ekotoxikologiska effekter

Publikationen registrerades 2015-06-25.

CPL ID: 218843

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