Patent ID: 9211615
Filing Date: 2015-12-15
Classification: B23P,B63B,B63C,Y10T

Abstract:
1. A method for maintenance of a ship propeller while the propeller is under water, comprising the steps of: placing a flexible habitat having an open upper end over an uppermost blade and a portion of a propeller hub such that the habitat covers a part of the blade and at least a maintenance portion, establishing a gas seal between the upper end of the habitat and the blade to close the habitat at the upper end by clamping the blade from two sides using a pair of clamping bars which are connected to each other and press a flexible sealing material provided between each of the bars and the blade surface, fixing a lower end of the habitat relative to the propeller such that the lower end of the habitat remains below the maintenance portion, and introducing compressed gas into the habitat to displace the water in the habitat, so that maintenance work can be carried out at the maintenance portion above water level inside the habitat.