060-12 Lohr, 2012-09-04

6,000 meters under the sea

The test aggregate

The test aggregate demonstrates suitability of hydraulic components for deep-sea applications up to a depth of 6,000 meter.

The world-wide demand for oil, natural gas and minerals is increasing. In the search of new deposits companies advance to ever larger depths. Their development requires technical solutions that make it possible to extract the resources from great depths and in the associated rough environmental conditions. To this end, Rexroth has adopted numerous hydraulic components and tested them for suitability for deep-sea applications. These modifications ensure stability and reliability in practice, as well as a long service life.

To prepare companies for deep sea applications, Rexroth adapted numerous standard components to fit the special requirements for the rough conditions in deep-sea applications. The user can chose from different possible approaches for the pressure compensation that is necessary due to the high environmental pressure: the local pressure compensation is used where no differential volumes occur, e.g. hollow parts with no consumer connected. A pressure enclosure is sufficient in case of small volumes such as sensors. On the other hand, a central pressure compensation is used where several consumers are interconnected.

Rexroth developed an underwater power unit to test the components for deep-sea applications. It is equipped with a water-proof motor pump assembly that can drive an axial piston motor and hydraulic cylinders via an encapsulated valve control. Hydraulic components and electronic parts are tested close to reality under deep sea conditions at up to 600 bar water pressure in an underwater test chamber, that equals a water column of 6 kilometers.

Bosch Rexroth AG is one of the world’s leading specialists in the field of drive and control technologies. Under the Rexroth brand name, the company supplies more than 500,000 customers with tailored solutions for driving, controlling, and moving. Bosch Rexroth is a partner for Mobile Applications, Machinery Applications and Engineering, Factory Automation and Renewable Energies. The company provides customized solutions tailored to the needs and specifications of each individual market. As The Drive & Control Company, Bosch Rexroth develops, produces, and sells components and systems in over 80 countries. As part of the Bosch Group, Bosch Rexroth and its 38,400 associates generated approximately 6.4 billion euros in revenue in 2011.

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The Bosch Group is a leading global supplier of technology and services. According to preliminary figures, more than 300,000 associates generated sales of 51.5 billion euros in the areas of automotive and industrial technology, consumer goods, and building technology in fiscal 2011. The Bosch Group comprises Robert Bosch GmbH and its more than 350 subsidiaries and regional companies in some 60 countries. If its sales and service partners are included, then Bosch is represented in roughly 150 countries. This worldwide development, manufacturing, and sales network is the foundation for further growth. Bosch spent more than 4 billion euros for research and development in 2011, and applied for over 4,100 patents worldwide. With all its products and services, Bosch enhances the quality of life by providing solutions which are both innovative and beneficial.

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Susanne Herzlieb
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