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Project said to prove viability of CFD analysis to calculate LNG boil-off rate

13 Sep 2017 13:17 GMT

Project partners expect to be able to build efficiencies into future designs of cargo tanks and boil-off gas processing systems.



The American Bureau of Shipping (ABS) and vessel operator GasLog LNG Services (GasLog) report that they have completed a joint development project demonstrating a new approach to evaluating LNG boil-off rate (BOR).

Liquefied natural gas (LNG) can be stored in insulated tanks and kept in a liquid state for long periods. However, heat flux from the surroundings will increase the temperature inside the tank, thus causing the liquid to evaporate.

The generated gas from this process is known as boil-off gas (BOG), and the accurate assessment of the rate of LNG boil-off gas generation is critical for the design of a cargo tank and the boil-off gas processing system.

To support the project, a CFD analysis procedure was developed modelling the physics of heat transfer, boiling, phase change and vapour flow. Extensive simulations were run on a representative LNG carrier and actual BOR measurements were taken to demonstrate the accuracy of the analysis results.

"By expanding the application of computational fluid dynamics (CFD) analysis to simulate the LNG BOR in cargo tanks, owners are able to better predict boil-off gas and account for it in future designs and operations of LNG carriers," said ABS Chief Technology Officer Howard Fireman. "As a technology leader, we are committed to working with industry to drive safer and more efficient operations."

"By taking a collaborative approach with ABS on this project, we were able to demonstrate and prove the viability of CFD analysis to determine LNG BOR," remarked GasLog FSRU Project Engineer Vassilis Millas. "Being able to predict BOR in various operating conditions will allow us to build efficiencies into future designs."

Recognizing the changing landscape and increased industry focus on gas, ABS launched its Global Gas Solutions team in 2013 to support industry in developing gas-related projects. The ABS Global Gas Solutions team offers guidance in LNG floating structures and systems, gas fuel systems and equipment, gas carriers, and regulatory and statutory requirements.

ABS has also been the preferred classification society for some of the world's most advanced gas carriers.




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