2013年9月和11月，通用動力NASSCO公司與SEACOR海洋運輸公司簽訂合同，設計和建造三艘50,000載重噸的液化天然氣改裝產品船，運載能力為330,000桶。

這些610英尺長的油輪是一種新的 "ECO "設計，提供更好的燃料效率。這些船將由韓國釜山的大宇造船和海洋工程公司（DSME）的子公司DSEC設計。DSEC的 "ECO "設計通過幾個特點實現了燃油效率的提高，包括一個G系列MAN ME慢速主機和一個優化的船體形式。

ECO級油輪是在圣地亞哥的NASSCO船廠建造的。第一艘油輪于2014年第四季度開始建造，2016年開始交付，一直持續到2017年。

英文介紹

In September and November of 2013, General Dynamics NASSCO entered into contracts with SEACOR Ocean Transport Inc., for the design and construction of three 50,000 deadweight ton LNG-conversion-ready product carriers with a 330,000 barrel cargo capacity.

The 610-foot-long tankers are a new “ECO” design that offers improved fuel efficiency. The ships will be designed by DSEC, a subsidiary of Daewoo Shipbuilding & Marine Engineering (DSME) of Busan, South Korea. DSEC’s “ECO” design achieves improved fuel efficiency through several features, including a G-series MAN ME slow-speed main engine and an optimized hull form.

The ECO Class tankers were constructed at the NASSCO shipyard in San Diego. Construction of the first tanker began in the fourth quarter of 2014, with deliveries starting in 2016 and continuing through 2017.