GasSouth Korea’s top three shipyards battle it out for $500m ethane carrier orderChinese shipyards excluded from ONGC’s plan to build three 100,000-cbm vesselsSamsung Heavy Industries is one of three South Korean shipyards bidding to build ONGC’s 100,000-cbm VLEC newbuildings.Photo: Samsung Heavy IndustriesIrene AngTradeWinds correspondent