North Sea Winches (NSW) have recently designed, manufactured, commissioned and supported a state of the art quadrant handling system for offshore contractor DeepOcean. Working for a leading international developer DeepOcean have delivered class leading efficiency completing inter array cable installations from the vessel Maersk Recorder for a U.K. east coast wind farm development.

Working closely with DeepOcean, NSW supplied equipment including a 20 tonne active heave compensated winch a 5 tonne constant tension winch and three 110KW HPU’s to operate the two winches and an overboarding A-Frame. The new equipment has greatly improved cable lay times, of at least two completed lays in a 24 hour period and with the active heave function meant working through what would be hold points in poor weather conditions.

NSW are in a joint venture with MJR Controls of Stockton to deliver active heave and constant tension solutions to the offshore and marine markets.


KTR developed a floating caliper brake which is made of one single piece. The new XS series is optionally available with a hydraulic or electromechanical operating principle and can both be operated in an active and passive mode. The brakes are suitable for sub- zero applications with temperatures ranging down to -40 °C.

The brake caliper of the new XS series combines the housing, spacer plate, and counter plate as one piece and is made of special LT nodular iron. This makes the floating caliper brakes suitable for sub-zero applications with temperatures ranging down to -40 °C. All other components such as pad retainers, pistons and guide pins are made of steel. The brake pads are made of “organic mixture” or “sinter metal” and can easily be replaced by one single person. Depending on the application’s preference and basic conditions, the xS brake can be operated either hydraulically or electromechanically, with clamping forces up to 15 kN being generated in the passive

design and 16.5 kN in the active design. The brakes are mounted to the respective machine each by two screws size M16. “Since the brake caliper of the new series is made of one piece, there are no more exposed contact surfaces“, fabian liekam, Product Manager for Brake Systems in KTR explains. “In doing so we improved the brake’s corrosion resistance. In addition, the one-piece design allowed us to extend the guide pins and double the number of bushings, improving the brake’s floating operation and the efficiency of transmission of force from the caliper to the base plate. This makes the brake even stronger.“ The new floating caliper brakes series “xS” are intended for applications in the most demanding environmental conditions, both above or underground, onshore or offshore, and can be used both as service brakes, for high numbers of cycles, and as holding brakes.

The brakes are selected and adapted in the “KTR Competence Centre for Brake Systems” located in Schloß Holte-Stukenbrock/East Westphalia. At this location KTR pool their

activities for brakes under the umbrella of KTR Brake Systems GmbH. Apart from developing and producing brake systems, tests and functional testing of prototypes and serial products are performed here as well. As an example, tests are performed on a universal brake test bench for rotor and yaw brakes, a tension test bench, a vibrating table or a cryogenic temperature cooling chamber allowing for tests with ambient temperatures down to – 40 °C.

lee Smith, DeepOcean Project Manager commented:

This project one of the first combined Active Heave / Constant Tension deck layouts for NSW and MJR, it has proved their abilities beyond doubt. The winches and controls were installed over a ten day mobilization and then put straight into operation on a time critical cable deployment, everything went according to plan.

Robert Gretton, Managing Director of NSW said:


DeepOcean needed a safe, reliable and operator friendly system. We were only too happy to help, with winches and controls already developed and tested by NSW and MJR using the X-Wave system it was a perfect opportunity to flaunt our capabilities.

While NSW and MJR (ActiveWinch) are currently working towards a range of AHC Hire Units they are also undertaking the development of a AHC winch for a subsea trenching vehicle and also the retrofitting of a pair of 30 tonne AHC offshore cranes.

Above: Using this image for editorial purposes is free of charge (© KTR Brake Systems GmbH).

March 2017 | | p31

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