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Thursday, September 19, 2019 

At Gastech 2019 in Houston, Lloyd’s Register (LR) has presented Approvals in Principle (AiPs) to Jiangnan Shipyard and Daewoo Shipbuilding & Marine Engineering (DSME) for novel very large gas carrier (VLGC) designs.

Jiangnan Shipyard Group received AiP for its 91,000 m3 VLGC design, named 'Panda 91T', which includes an LPG dual-fuelled main engine and relevant fuel gas system, as well as an optional air lubrication system, meaning that the Energy Efficiency Design Index (EEDI) is about 40% lower than the base value, for improved efficiency.

LR facilitated a basic-level hazard identification (HAZID) workshop for the LPG fuel supply system and associated technology in accordance with LR’s ShipRight Procedure for Risk-Based designs.

“Jiangnan has secured seven VLGC contracts of Panda 86P this year with great support from LR, but considering LPG fuel capacity for a round trip, more than 6,000 cubic metres tank volume may be required. How to capture more space for gas and still keep full compatibility, ship dimensions, draught, manifold height, identical with conventional VLGC – Jiangnan’s designers were facing a big challenge,” Hu Keyi, Chief of Global Technology of Jiangnan Shipyard said.

Mark Darley, LR’s LR North Asia President, said: “We are proud to be part of the ‘new’ generation of such VLGCs, offering unique expertise to this gas ship market, and continue to support our customers in the delivery of safe, efficient and sustainable operations across the entire gas supply chain.”

The LR AiP awarded to DSME is for its 98,000 m3 Very Large Ethane Carrier (VLEC) design with new cryogenic material High Manganese Austenitic steel (High MnA) and sloshing-free tank, the first VLEC design to use this type of material. The design employs the DSME-patented ‘Type B’ tank so it can operate with partial loading due to its sloshing-free properties. The design has the potential to carry a variety of different gases such as LNG, commercial ethane/ethylene, pure propane, commercial butane, commercial propane, mixture of propane and butane in any proportion, and propylene.

LR carried out the design appraisal including structural design assessment, sloshing and scantling assessments, in accordance with LR’s ShipRight Procedure. Currently, the application of High MnA steel is only defined for the use of LNG cargo and/or fuel tanks, however the material could be expanded as a tank for other cargoes with higher design temperatures than LNG.

Odin Kwon, DSME EVP and CTO, said: “This is a significant milestone for DSME towards an unexplored market and demonstrates our commitment to taking a step forward to help meet the challenge of the diversity and flexibility as featured in the new market.”

Darley said: “Lloyd’s Register was the pioneer of High Manganese Austenitic steel adoption so we’re proud to be partnered with DSME now for this innovative design, particularly as ethane/ethylene is becoming more visible in our industry. The cost of this steel is competitive against conventional high-nickel equivalents and is expected to help reduce capital costs in LNG-fuelled and LNG carrier systems, helping our clients stay competitive and economically efficient.”

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