Strainstall Marine turn “theory to reality” for Vigor Wave Energy with mooring monitoring solution

July 2012

Strainstall provides crucial monitoring technology for new wave energy converter


Vigor Wave Energy AB  selects Strainstall subsea load shackles to support the monitoring of mooring loads on a prototype of its highly innovative wave energy system.

The Vigor Wave Energy Converter harnesses the energy of ocean waves to produce a clean, completely renewable source of electricity. The concept is based on an array of large, flexible hoses into which pulses of seawater and air are introduced by the action of successive waves. The fluid is forced along the length of each of the hoses by the motion of the waves on its exterior. The output of the array is connected to a central hub in which the internal water flow is passed through a turbine which drives an electric generator.


With prototype testing about to commence, a crucial issue for the Vigor Wave Energy is to establish and quantify the static and dynamic forces acting on the device’s mooring lines during operation in a range of sea conditions. To achieve this, the company has selected Strainstall subsea load shackles to secure their mooring lines. Shackles are standard equipment for chain and rope assemblies, but the Strainstall subsea load shackle incorporates a load measuring pin in place of the usual solid component. This load cell provides a direct measurement of the force transmitted by the line to which it is attached and is completely unaffected by the external water pressure that it is subjected to.


“With these results we will be able to say a great deal about the dimensioning, the design and the survivability of the system – based on real data, not just scale tests and theory,” said Vigor Wave Energy Engineer Nicolas Wolf. “Of course this will save us a lot of money in the future, not just through the dimensioning itself, but also by allowing us to focus more on other development issues. The load shackle’s measurements constitute a very direct way for us to move from theory to reality”


“The Strainstall subsea load shackle is just one of the high quality measurement products engineered for applications in the challenging offshore environment that we are supplying to the marine renewable sector,” said Simon Everett, Strainstall Marine MD “With options ranging from single or multiple installations to a fully integrated solution that enables customers the ability to log data for analysis, or transmit via SCADA systems, these products provide crucial data for the developers both of new technology concepts such as Vigor Wave Energy as well as for those engaged in commercial scale implementations.”





Strainstall is a broad-based engineering business, specialising in load measurement and sensor based safety technology, with over 40 years of experience in a wide range of industries. Based in Cowes, Isle of Wight, the company has long been associated with the manufacture of standard and bespoke load cells.

Strainstall has over 45 years experience in assisting industries to operate safely by ensuring that structures, equipment and infrastructure are safe to use. Through continuous innovation and development Strainstall have a range of world-class monitoring technologies that continuously monitor physical and performance parameters such as load, stress, temperature, acceleration, pressure and displacement. To date Strainstall has completed over 30 monitoring installations on off-shore wind turbine structures, in addition to being a supplier of choice to the offshore oil and gas industries world-wide. For more information see


James Fisher & Sons plc is a leading service provider in all sectors of the marine industry and a specialist supplier of engineering services to the nuclear industry in the UK and abroad. With offices in the Europe, the Middle East, Singapore, India, Australia and Africa, the company serves both the private and public sectors and adopts a practical approach to the management of assets and provision of high quality services, ensuring an appropriate use of technology and a sound understanding of each customer’s requirements. Building on the experience and expertise gained over more than 160 years of operating in the marine environment. James Fisher brings practical experience, innovation and commercial best practice to all of clients’ projects and services. For more information see



Business contact (Strainstall products and services):

Scott Cruttenden

Business Development Manager – Renewable Energy

Tel : +44 (0)1983 203600


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