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Mary R. Koch
The ''Mary R. Koch'' was a 274.330 Mt combined ore carrier and oil tanker. The ship was named after Mary Robinson Koch, wife of American industrialist Fred C. Koch.
The ''Mary R. Koch'' was built at the Uljanik, Brodogradiliste l Tvornica Dizel Motora shipyard in Pula in Socialist Federal Republic of Yugoslavia, (now Croatia). Her two sister ships, the ''Tafala'' and the ''Torne'' were delivered to the Swedish company Trafikaktiebolaget Grengesberg in 1974.〔 A further sister-ship named Kanchenjunga was built as a pure oil carrier with no ore capability.
Under Greek management the Mary R. Koch (callsign A8QU) was time-chartered to Exxon for three years from going into service. Subsequently she made spot voyages arranged by the oil-trading division of Koch Industries. Around 1980 Koch Shipping was created and the Mary R. Koch was managed directly from Wichita, with officers and crew being supplied by an agency in Piraeus. Due to severe corrosion problems with piping in the 'void space' double bottom the ship transferred to the bulk-ore trade in the early 80s.
The four ships of this design were built to prove the practicality of the Kam-e-Wa variable pitch propellor system in high SHP applications. Although the system did function well the high initial and subsequent maintenance costs associated with having two 20,000 HP B&W diesel engines, together with the inferior steel used for the cargo piping, compounded by the depressed tanker market at the time, meant that they were never viable economically.
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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