DNV developed a new concept for prismatic ‘type B’ LNG tanks.- According to IMO rules, it is required for partial secondary barrier – to avoid leakage in fuel tanks.
DNV has granted an Approval In Principle (AIP) to PASSER Marine for the development of a new LNG fuel tank insulation system, says an article published in DNV.
PASSER Marine COO’s Comments
“The system they had developed was cost-effective and production-friendly,” said Svein Konradsen, COO of PASSER Marine AS.
“The pandemic has been challenging for many companies and for the development of this particular design. The required testing has been difficult to finalize due to testing interruptions and limited possibilities to travel, but finally, they were able to submit the necessary documentation which pleased them to say that was accepted by DNV.”
Increase in Fuel Tank Capacity
As LNG fueled vessels are increasingly being deployed for deep-sea shipping, fuel tank sizes need to increase from 300-1000 m3 fuel capacity to up to 10,000-20,000 m3 which leaves less room for cargo.
Advantages of Type B Tanks
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 fueled ships contain type C fuel tanks, but many new builds 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.”AIP is widely recognized in the industry as an early phase verification level for new design concepts or for existing designs in new applications.
DNV to carry out third party verification
An AIP issued by DNV is an independent assessment of a concept according to an agreed requirement framework within DNV Rules, notations, and regulations for which DNV is authorized to carry out third party verification, confirming that a design is feasible and that no major obstacles would prevent the concept from being realized.
Did you subscribe to our daily newsletter?
It’s Free! Click here to Subscribe!
Source: DNV
