Classification society DNV GL has presented Vancouver, B.C., based naval architecture firm Robert Allan Ltd. with an Approval in Principle (AiP) for a natural gas fueled shallow draft pushboat design, the RApide 2800-G.
The design incorporates “Pure Gas’” main engines, eliminating the need to use diesel fuel at any point during operation.
Developed in close cooperation with Rolls-Royce’s MTU brand, the design incorporates an LNG propulsion system comprised of two 746 kW MTU 8V4000M55R-N IMO Tier III gas-safe main engines and an LNG tank system with integrated control, safety and monitoring systems. The system uses two independent tank connection spaces attached to the LNG tank to ensure safety and redundancy.
The configuration is based on Robert Allan Ltd.’s RApide 2800-Z2 – a proven vessel currently operating on the Amazon River system. While keeping the existing hull form, the arrangement was reconfigured to allow the installation of the LNG tank and associated equipment while still accommodating auxiliary machinery and continuing to provide a comfortable work environment for the crew. Despite the vessel’s compact size, the Approval in Principle confirms the concept is feasible and meets DNV GL’s rule requirements as well as that of the IGF code.