Abstract: A sealing assembly for a stem tube implemented in a retractable thruster system and the retractable thruster system therefor. The sealing assembly comprises an annular sealing housing. The annular sealing housing comprising a first sealing layer, arranged at an opening of the annular sealing housing, configured to prevent marine growth and fluid ingress, a second sealing layer, arranged after the first sealing layer, configured to form a water-tight seal against the stem tube, a third sealing layer, arranged after the second sealing layer, configured to accommodate relative movement of the stem tube, a fourth sealing layer, arranged between the first sealing layer and the second sealing layer, configured to be inflated for providing a temporary sealing barrier; and a drainage channel, arranged between the first sealing layer and the second sealing layer, configured to provide a dedicated path for removal of fluid ingress from the annular sealing housing.

Abstract: Disclosed is an oil filtration and lubrication system for a sealing system of an azimuth thruster, oil filtration and lubrication system includes oil filter comprising layers of filter material, layers being arranged within oil filtration chamber, have predefined distance therebetween; and oil circulation arrangement, when system is in use, oil circulation arrangement enables passage of unfiltered oil between layers, at flow rate which is less than predefined flow rate, oil filter removes impurities from unfiltered oil, and then filtered oil is passed from oil filter to sealing system of azimuth thruster, by oil circulation arrangement, filtered oil lubricates azimuthing seal, propeller shaft seal, of azimuth thruster, and wherein oil filter is configured to remove impurities from oil, which impurities have a size down to 0.1 micrometre.

Abstract: A system for measuring wear of a radial lip seal arranged circumferentially over a rotatable axle A sensor is configured to measure the wear of the radial lip seal by measuring the distance between the sensor and the radial lip seal. The wear of the radial lip seal corresponds to the distance of the radial lip seal from the sensor. The distance is measured between the sensor and the outer diameter of the radial lip seal. The sensor is configured for dynamic measuring of the radial lip seal and static measuring of the radial lip seal and to predict the replacement of the radial lip seal. Static measuring refers to the measurement performed by the sensor when the rotatable axle is stationary and dynamic measuring refers to the measurement performed by the sensor when the rotatable axle is rotating.