SINGAPORE'S Neptune Orient Lines (NOL) has ordered three double-hulled Aframax crude oil tankers from Samsung Heavy Industries of South Korea. NOL said 12-year charters have been secured for the 100,000 deadweight tonne (dwt) tankers from Bayway Refinery, a subsidiary of the Tosco Corp of the United States. Tosco is one of the largest independent oil refining companies in the US. The three charters will generate about US$24 million in the first year. The charter terms provide for revenue increases of about $500,000 a year to take into account higher operating costs. The vessels, to be delivered in the second half of 1996, will be registered in Singapore. The tankers will be designed with the latest technological features which meet the requirements of the US Oil Pollution Act of 1990. The tankers will have six pairs of tanks segregated by a centre-line bulkhead. They will have an operating speed of 15 knots. NOL owns and operates 58 vessels with a total deadweight of more than three million tonnes.