
Longitude Unveils Alt-Fuel PSV Design | Mariner News
Longitude, a leading design and engineering consultancy, has unveiled an innovative Alt-Fuel Platform Supply Vessel (PSV) design, setting a new benchmark for sustainable offshore operations. The new ‘D-Flex’ concept is specifically engineered to be ready for future alternative marine fuels such as methanol, offering a proactive approach to shipping’s decarbonization efforts while prioritizing cost-efficiency for owners.
Innovative D-Flex Design for Future Fuels
The ‘D-Flex’ design marks the second in Longitude’s IMT Isca series, evolving from their earlier PSV concepts. Though more compact than many contemporary PSVs, it boasts significant flexibility, allowing layouts and equipment to be customized for diverse owner requirements. Crucially, its alternative fuel-ready architecture makes it suitable for evolving environmental regulations and market demands across offshore markets in Asia, the Middle East, West Africa, and potentially the North Sea.
Maximizing Owner Profitability and Efficiency
At the core of the ‘D-Flex’ design is a focus on maximizing profitability. Duncan Grigg, Longitude’s product lead, emphasizes that the vessel aims for low CAPEX and OPEX. This makes it an attractive proposition for charterers seeking efficient and environmentally conscious solutions. By delivering a smaller, yet highly capable and methanol-ready vessel, Longitude offers a valuable alternative for owners where larger PSVs are impractical or uneconomical, paving the way for more sustainable shipping practices.
This forward-thinking Platform Supply Vessel design exemplifies how naval architecture can meet both economic and environmental challenges, providing robust, future-proof options for the global maritime industry.



