en.Wedoany.com Reported - HD Hyundai Heavy Industries (HHI) has received Approval in Principle (AiP) from DNV for two designs: a 1,400 TEU LPG dual-fuel container ship and an independent LPG Type B cargo tank for Very Large Gas Carriers (VLGCs).

In the container ship sector, LNG is the mainstream alternative fuel, but LPG offers additional pathways to improve operational efficiency and reduce emissions through a simpler fuel system and ease of operation, while achieving a favorable balance between investment and operating costs and simplifying ship design. HHI's new 1,400 TEU LPG dual-fuel design adopts a layout similar to LNG systems to reduce technical risk while maintaining operational reliability. The design positions the superstructure forward to maximize container carrying capacity and ensure crew isolation from hazardous areas. Type C LPG storage tanks, a low-flashpoint fuel supply system (LFSS), and a bunkering station are arranged on the open aft deck to optimize cargo handling and minimize risks to accommodation areas. Additionally, the design integrates a composite boiler that also functions as a Gas Combustion Unit (GCU) for LPG, effectively managing Boil-Off Gas (BOG).

For the independent LPG Type B cargo tank design for VLGCs, this AiP covers HHI's newly developed system for a 90,000 m³ independent Type B LPG cargo tank. Adopting such cargo tanks in VLGCs aims to enhance operational safety, simplify maintenance throughout the ship's lifecycle, and provide shipyards with greater flexibility in selecting inner hull materials during the design phase. Technical analysis includes crack propagation and structural fatigue studies, as well as standard buckling and sloshing assessments for Type A cargo tanks. The design seeks to prevent surface defects from penetrating the tank wall within the expected service life to maximize structural reliability. As a safety measure, the solution includes a partial secondary barrier consisting of a leak channel system covering all welding areas for jet protection, while each cargo tank is equipped with four dedicated drip trays to contain potential leaks and protect the surrounding hull structure.

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