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The recent conversion from sealed oil lubricated bearings to open water lubricated bearings on the bulk carrier Peter R Cresswell demonstrates the way owners of existing ships are solving oil pollution leakage issues.
A growing band of owners of existing ships are coming to realize that the environmental and maintenance benefits offered by switching to water lubricated stern tube bearings are as pertinent to their operations as to those investing in new tonnage.
After all, the zero tolerance increasingly being pursued by authorities of ship source pollution applies equally across all ships, and the prospect of eliminating a pollutant source entirely below the waterline can only be persuasive.
Last year, new US Environmental Protection Agency National Pollutant Discharge Elimination System (NPDES) rules specifically targeted oil lubrication discharges from stern tubes. The new requirements carry extensive civil and criminal penalties for violations, including the threat of jail. In Europe, meanwhile, the 2007 European Union Maritime Policy specifies the elimination of all vessel discharges into the marine environment by 2020.
Leakage from an oil lubricated stern tube doesn
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| NU2332 KOYO | 160 | 340 | 114 |
| NU332R KOYO | 160 | 340 | 68 |