Skip to main content



Tuesday, May 4, 2021 

DNV has granted an Approval In Principle (AIP) to Passer Marine for the development of a new LNG fuel tank insulation system, designed for prismatic type B LNG tanks - which according to IMO rules require a partial secondary barrier - and which includes a leakage detection system capable of safely managing and containing fuel leaks.

Passer Marine COO Svein Konradsen said: “The system we have developed is cost-effective and production-friendly. The pandemic has been challenging for many companies and for the development of this particular design. The required testing has been difficult to finalise due to testing interruptions and limited possibilities to travel, but finally we have been able to submit the necessary documentation which I am very pleased to say was accepted by DNV.” 

As LNG fuelled vessels are increasingly being deployed for deep-sea shipping, fuel tank sizes need to increase from 300-1000m3 fuel capacity to up to 10,000-20,000m3 which leaves less room for cargo.

As such, there is increased industry interest in alternative fuel tanks – known as ‘type B’ – which are prismatic in shape and more volume efficient than traditional cylindrical ‘type C’ tanks. Between 95 and 99% of LNG fuelled ships contain type C fuel tanks, but many newbuilds on order contain ‘type B’ specifications.

“There are several insulation concepts under development that provide an integrated secondary barrier and leakage detection system, but there are few proven systems available on the market,” said Monika Johannessen, DNV Maritime Head of Department, Gas Carrier Excellence Centre. “We are pleased that Passer Marine has chosen DNV to pursue verification for this innovative concept and look forward to receiving the documentation for full approval.”

The AiP is an independent assessment of a concept according to an agreed requirement framework within DNV Rules, notations and regulations for which DNV is authorised to carry out third part verification, confirming that a design is feasible and that no major obstacles would prevent the concept from being realised.

Reader Comments (0)

There are currently no comments on this article. Why not be the first and leave your thoughts below.

Leave Your Comment

Please keep your comment on topic, any inappropriate comments may be removed.

Return to index