Due to new U.S. regulations, almost all ships exceeding 24 meters in length which are operating in U.S. coastal waters are confronted with much stricter environmental protection requirements. The Vessel General Permit (VGP), in effect since December 19, 2013, stipulates that rapidly biodegradable oils called Environmentally Acceptable Lubricants (EAL) must be used in interfaces where oil can contaminate seawater. This affects many underwater components of a vessel, ranging from the stern tube seal to the mechanics in the variable pitch propeller, bow thruster, rudder stock, pod drive and stabilizers as well as dredging equipment. The…