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Thursday, February 28, 2019 

Torgy LNG and DNV GL have released details of a new IMO Type A LNG containment system, offering the benefits of high volume efficiency, full secondary barrier protection and anti-sloshing.

The non-pressurised IMO Type A tanks employ a prismatic design and full secondary barrier, with longitudinal bulkheads, giving superior anti-sloshing characteristics. Compared to IMO Type C pressurized tanks generally used on smaller vessels, Type A tanks boast 30-40% greater volume efficiencies.

Torgy started working on LNG fuel systems in 2005, and has developed its tank designs since then, working initially with Rolls-Royce and going to DNV GL for approvals. DNV GL issued an updated General Approval for Ship Application (GASA) statement in 2017.

“We are very pleased to have been able to present Torgy LNG with the updated GASA statement,” said Johan Petter Tutturen, Business Director for Gas Carriers at DNV GL. “The development process has been ongoing for some time and we have cooperated very closely with the team at Torgy LNG to ensure that they have the input they need to meet the GASA requirements. Working with unconventional design solutions is always a rewarding challenge, as they force us to examine and apply our thinking in new ways so that we can be sure that they meet the safety levels set down in the DNV GL rules and other relevant regulations.”

Sven Halvorsen, CEO of Torgy LNG, said: “We have had good feedback in general on the system, and from at least two large container-ship owners. They appreciate the sloshing barrier feature of the A tank. We are also working with a shipowner looking to use the system in a bunker ship. The A tank is well suited to bunkering, as it offers flexibility and safety together with significantly larger volumes than C tanks.”

There are significant CAPEX and OPEX advantages of using the A tank design for bunkering, Halvorsen says. “We can allow the owner to build a smaller ship at less expense, but with more volume than with a pressurised tank."

He continued: “The Type A allows owners to use LNG as a fuel for larger vessels. Container ships are a primary market, but also cruise ships, car carriers and other deep-sea carriers requiring a larger volume of fuel with tanks under deck.”

Like many others, Torgy believed that LNG as a fuel would take off stronger and earlier than it has. “But regulatory drivers have taken hold now, and the transition is picking up speed. LNG infrastructure is also falling into place, so the ‘chicken and egg’ debate is over,” Halvorsen maintains. “The deep-sea market is coming on as well. I have to say that we are optimistic about current and future market development.”

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