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Arctic Design: Sea spray icing models to be improved

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DNV ARCTIC 26082014Sea spray icing is one of the major challenges when operating in Arctic conditions. DNV GL is now launching an industry collaboration which will develop a simulation model that bridges functional winterisation requirements and real physical conditions for drilling rigs, production platforms and vessels. Experts from both the maritime and oil and gas industries are invited to join the new Joint Industry Project (JIP) ‘RigSpray’. 

“We aim to ensure that the design of icing-mitigation measures delivers both safety and cost benefits, ” says Per Olav Moslet, Arctic Technology Programme Director at DNV GL.

DNV GL Per Olav Moslet

DNV GL Per Olav Moslet

Today, the operational capabilities of conventional vessels and offshore structures do not meet the requirements for operating in harsh Arctic conditions. The trend towards increased activity in the Arctic and especially the ice-free areas means that the issue of sea spray icing needs to be addressed.

“Sea spray icing poses a threat on multiple levels, from blocking the operation of essential components to jeopardising stability and integrity and thus leading to an increased risk of capsizing, ” explains Moslet.

A number of recognised standards, for example DNV GL’s offshore standard ‘Winterization for Cold Climate Operations (DNV-OS-A201)’, provide guidance on mitigating ice accumulation using specified anti- and de-icing procedures. The standards available today today give requirements to safety functions and to some extent describe mitigation solutions, but do not give a specific answer to how and where they should be implemented. An optimal answer to those two questions can be given by even better understanding the physical phenomenon of sea spray icing via simulation and measurements. Overall, the benefit would be an  improved safety and working environment in Arctic conditions.DNV ARCTIC two 26082014

To deal with this, DNV GL is therefore establishing the new RigSpray JIP and invites maritime and oil and gas experts to participate.

“We have already made progress in addressing the challenge through the MarIce JIP, where DNV GL worked together with the Norwegian University of Science and Technology and Statoil to create the world’s most advanced marine-icing model. However, this needs to be developed further. The present model still lacks an accurate representation of sea spray, which is a very important parameter for ice formation. Present knowledge of sea spray generation is limited to very local metocean conditions and sporadic vessel designs. We certainly need to fill this gap with more experimental and modelling studies, ” says Olga Shipilova, DNV GL’s Project Manager for the RigSpray JIP.

Olga Shipilova

Olga Shipilova

The first step is to develop a software tool to further understand sea spray icing using  mathematical modelling and measurements. This will provide a solid basis for extending local ice estimations to a wider spectrum of metocean and structural conditions, which in turn will lead to safer and more cost-effective winterisation solutions for drilling rigs, production platforms and vessels operating in cold climate areas.

About DNV GL

As of 12 September 2013, DNV and GL have merged to form DNV GL. Driven by our purpose of safeguarding life, property and the environment, DNV GL enables organizations to advance the safety and sustainability of their business. We provide classification and technical assurance along with software and independent expert advisory services to the maritime, oil & gas and energy industries. We also provide certification services to customers across a wide range of industries. With our origins stretching back to 1864, our reach today is global. Operating in more than 100 countries, our 17, 000 professionals are dedicated to helping our customers make the world safer, smarter and greener.

About DNV GL Oil & Gas

In the oil and gas industry, GL Noble Denton and DNV’s Oil & Gas business have joined forces to enable safe, reliable and enhanced performance in projects and operations. We provide integrated services in: technical assurance; marine assurance and advisory; risk management advisory and offshore classification. Our 5, 500 people combine industry expertise, multi-disciplinary skills and innovation to solve complex challenges for our customers. Together with our partners, we drive the industry forward by developing best practices and standards across the asset lifecycle.

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