Abstract: The invention relates to an assembly for centring a first elongate tubular element and a second elongate tubular element, such as an underwater pile accommodated within a noise mitigation screen, at a common central longitudinal axis along which axis both the first and second element extend, and wherein the centre system is provided with first coupling element for fixedly coupling the centre system with one of the first and second tubular elements, and second coupling element for engaging the other tubular element for centring the other tubular element at the central axis.

Abstract: The invention relates to an assembly for centring a first elongate tubular element and a second elongate tubular element, such as an underwater pile accommodated within a noise mitigation screen, at a common central longitudinal axis along which axis both the first and second element extend, and wherein the centre system is provided with first coupling element for fixedly coupling the centre system with one of the first and second tubular elements, and second coupling element for engaging the other tubular element for centring the other tubular element at the central axis.

Abstract: A method is provided of radially expanding a tubular element (56) in a well-bore using an expander located in the tubular element, the expander (40) comprising an expansion member (48) and a plurality of segments (50) spaced in circumferential direction around the expansion member, the segments being movable between a radially retracted position and a radially expanded position by axial movement of the expansion member relative to the segments. The method includes a plurality of successive expansion cycles, wherein each expansion cycle comprises the steps of: (a) moving the expander (40) in axially forward direction through the tubular element (56) whereby the segments (56) are in the radially retracted position; and (b) radially expanding the tubular element by moving the segments to the radially expanded position by axially moving the expansion member relative to the segments.

Abstract: The invention relates to a system for installing or removing foundation elements, such as piles, anchors, and conductors, in a subsea ground formation, comprising an impact weight, an hydraulic circuit in turn comprising an hydraulic cylinder for lifting and/or accelerating the impact weight respectively away from and towards the element, the cylinder comprising a piston connected to the impact weight, and wherein a pump for generating an underpressure in the hydraulic cylinder such as to lift and/or accelerate the impact weight by means of this underpressure.

Abstract: The invention relates to a system for installing or removing foundation elements, such as piles, anchors, and conductors, in a subsea ground formation, comprising an impact weight, an hydraulic circuit in turn comprising an hydraulic cylinder for lifting and/or accelerating the impact weight respectively away from and towards the element, the cylinder comprising a piston connected to the impact weight, and wherein a pump for generating an underpressure in the hydraulic cylinder such as to lift and/or accelerate the impact weight by means of this underpressure.

Abstract: An arrangement for installing building elements, such as piles and tunnel sections, into a ground formation, where a building element is provided. Two or more impact drivers for delivering blows to the element are mounted on or operatively connected to the element. Accordingly, large elements, such as monopiles for wind turbines, which may comprise a steel tube having a diameter in excess of 5 meters, or even tunnel sections, can be installed by utilizing a number of relatively small impact drivers.

Abstract: The invention pertains to a driver (1) for installing foundation elements, such as anchors or piles, in a ground formation and preferably in submerged condition, comprising a housing for accommodating and guiding a weight, an element for mounting the driver (1) on or in the foundation element, one or more chambers for holding a charge or one or more connectors for connecting the driver (1) to a source of a high pressure gas, and corresponding conduits allowing a high pressure gas to flow from the chamber(s) or connector(s) to below the weight. The housing is adapted to allow a stroke of the weight having a length such that, during upward movement of the weight the pressure of the gas drops to a value, which will cause the weight to decelerate.