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Water contamination of the sterntube system is a frequent occurrence as a result of small, persistent water ingress or, in more dramatic cases, resulting from damage to the sterntube seal. Water contamination of the sterntube can lead to :

• Corrosion within the sterntube and of the sternshaft.
• Loss of lubrication with the potential for increased wear down, increased running temperatures and even wiping of white metal bearings.

Sterntube oils are designed and formulated specifically to meet the requirements of oil lubricated sterntube bearings, providing optimum lubrication conditions. The Hydrox oils absorb any water entering the sterntube, reducing the potential for problems associated with free water, and forming a ‘water in oil’ emulsion that maintains a very high level of corrosion protection and lubrication.

The emulsions formed have excellent stability therefore free water is not released even after prolonged standing. The Hydrox oils will absorb very high amounts of water whilst maintaining the corrosion protection and lubrication properties though a maximum recommended water content of 20% is advised for normal sterntube applications. In very many cases the properties of the Hydrox oils have enabled vessels to maintain their normal operating schedule and to avoid the high costs of carrying out emergency repairs or even dry dockings.

Further information regarding the properties, use and availability of the oils is available on: www.vickers-oil.com
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