A sealing system for use in an offshore wind turbine includes two interconnected tubular members, and a flexible sealing member. The flexible sealing member includes, seen in cross section: an annular attachment part; an annular strip shaped sealing part which is connected to said attachment part by means of an annular hinge portion of said sealing part, and which sealing part extends away from said attachment part in a direction which has a first component in a direction which is parallel to the axis of the annular attachment part; and an annular strip shaped actuator part extending from said hinge portion of said sealing part in a direction which has a component in the radial direction.

Disclosed herein is a gasket for formfitting the bottom part of an upper structure of a wind turbine, such as a transition piece or a turbine tower, with one or more foundation piles, where the gasket includes a polyurethane obtained by mixing (a) organic polyisocyanate, (b) polymeric compounds having at least two isocyanate-reactive hydrogen atoms, (c) 1 to 12 wt.-%, based on the total weight of components a) to c), of one or more chain extenders, (d) catalyst and (e) optionally fillers and/or polyurethane additives to give a reaction mixture and allowing the reaction mixture to cure where the polymeric compounds having at least two isocyanate-reactive hydrogen atoms (b) include polyetherol obtained by alkoxylation of a difunctional starter molecule (b1) and polyetherol obtained by alkoxylation of a trifunctional starter molecule (b2). Further disclosed herein is a method for mounting a transition piece of a wind turbine to a monopile.

A tower assembly system can include OEM supplied tower sections and intermediate flange(s) that facilitate the lifting of the tower sections over a previous section without the use of conventional overhead lifting systems. A method and system for assembling a wind turbine can involve placing intermediate flanges on the top and bottom of each section without permanently modifying existing components or using OEM supplied connection points.

A tower drum section includes: a drum section base, including two or more tower drum pieces successively distributed along its circumferential direction; and a connecting assembly. The connecting assembly includes a first connecting member and a second connecting member; the first connecting member is located inside one of the two adjacent tower drum pieces, and the second connecting member is at least partially located inside the other of the two adjacent tower drum pieces; the first connecting member includes an adapter portion and an anchoring portion. A tower includes two or more tower drum sections connected to each other. A wind turbine includes the tower. Disclosed are a mold for manufacturing the tower drum section and a method for manufacturing the tower drum section using the mold.

The object of the invention is a concrete segment of a section of a wind turbine tower which minimizes the undesirable local effects in the connection area between adjacent concrete sections, a section comprising at least two concrete segments, a set comprising two adjacent sections and a joint disposed between the two adjacent sections, a tower comprising at least one set and a mould configured to cast a concrete segment.

The object of the invention is a concrete segment of a section of a wind turbine tower which minimizes the undesirable local effects in the connection area between adjacent concrete sections, a section comprising at least two concrete segments, a set comprising two adjacent sections and a joint disposed between the two adjacent sections, a tower comprising at least one set, a mould configured to cast a concrete segment and a method of assembling a wind turbine.