Qatar is becoming a goldmine for Korean shipbuilders as the top three companies won orders for liquefied natural gas (LNG) tankers worth $7 billion. Hyundai Heavy Industries, Daewoo Shipbuilding & Marine Engineering and Samsung Heavy Industries have won combined orders of 34 LNG tankers since 2004. The shipbuilders are hoping to share another 10 orders, when they are commissioned next month. The LNG carriers are high-yield orders, as they are equipped with large spherical or box-shaped storage tanks, which are technically difficult to build but are lucrative for the makers. The carrier¡¯s average price exceeds $200 million, which is about three times more expensive than standard-size container ships whose price is around $70 million.