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Phase one of a new study by the classification society DNV GL has found that environmentally acceptable lubricants (EALs) are as safe as mineral oil-based lubricants for shaft bearing applications in most conditions, except when temperatures are low and oil-film pressure is high.
Hull fouling has been a problem since ships started sailing.
A study conducted to better understand the impact of environmentally acceptable lubricants (EALs) on stern tube bearings did not find definitive evidence that they were responsible for recently reported increases in bearing failures.
TOTE Maritime Alaska recently completed the first of four phases in the conversion of its two Orca-class ships, Midnight Sun and North Star, to use liquefied natural gas (LNG) as fuel.
Over the past few years, there has been an increase in reports of stern tube bearing failures and a perception that environmentally acceptable lubricants (EALs) may be to blame.