ABS joint development project with Vickers Oils and Imperial College London examines the application of Environmentally Acceptable Lubricants in stern tube bearing installations
ABS, a leading provider of class and technical services to the marine and offshore industries has conducted a study in conjunction with Vickers Oils and Imperial College London into Environmentally Acceptable Lubricants (EAL).
The study evaluated the properties of EALs used to lubricate stern-tube bearings, against mineral oil-based lubricants, following a spike in the number of failures reported in 2014 soon after the 2013 Vessel General Permit amendment which stipulated that EALs must replace mineral based lubricants.
The findings of the report concluded that there was no evidence that EAL’s were responsible for the failures of stern tube bearings, or that the use of mineral oils would have prevented those failures. The report identified the key properties that should be considered in the selection of EALs, which highlighted the importance of viscosity. ABS stressed the importance of good shaft alignment in single sterntube bearing installations, in light of the trend towards larger, heavier propellers operating at lower RPM.
To read a more detailed article, please click here to read the full report in Marine News magazine