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A self-discharger (or self-unloader) is a ship that is able to discharge its cargo using its own gear. The most common discharge method for bulk cargo is to use an excavator that is fitted on a traverse running over the vessel's entire hatch, and that is able to move sideways as well.
Because bulk cargo is so difficult to discharge, bulk carriers spend more time in port than other ships. A study of mini-bulk carriers found that it takes, on average, twice as much time to unload a ship as it does to load it. [60] A mini-bulk carrier spends 55 hours at a time in port, compared to 35 hours for a lumber carrier of similar size. [60]
The class is divided into three subclasses; the self-discharging lake freighters, the lake bulk carriers, and the Panamax self-discharging bulk carriers. Initially a nine-ship building program, six are operated by Canada Steamship Lines for use on the Great Lakes , while three are operated by CSL Americas for international trade.
Self-unloading freighter discharging bulk cargo at Duluth, Minnesota. Freighter MV James R Barker passing through the Straits of Mackinac MV John B. Aird , a laker with a single aft superstructure. The more recently built lakers, like CSL Niagara , have a single large superstructure island at the stern.
Michipicoten (named Elton Hoyt 2nd when she entered service in 1952) [4] [a] is a self-discharging lake freighter owned and operated by Canadian shipping firm Lower Lakes Towing of Port Dover, Ontario. [5] Michipicoten primarily hauls taconite from Marquette, Michigan, to the Algoma Steel Mill in Sault Ste. Marie, Ontario. [6]
The MV Kaye E. Barker is a self-discharging lake freighter owned and operated by the Interlake Steamship Company.She was originally built as the SS Edward B. Greene, and was later renamed SS Benson Ford before being sold to Interlake and named the MV Kaye E. Barker.
Bulk cargo refers to material in either liquid or granular, particulate (as a mass of relatively small solids) form, such as petroleum/crude oil, grain, coal, or gravel. This cargo is usually dropped or poured, with a spout or shovel bucket, into a bulk carrier ship's hold , railroad car / railway wagon , or tanker truck / trailer / semi ...
As a self-unloading ship, a bow-mounted conveyor system that is 249 feet (76 m) long is installed for offloading of bulk materials. [5] Ship propulsion power is about 7,800 horsepower (5,800 kW) from two diesel engines— EMD 710s on Mark W. Baker —and electrical power totals 3,440 kilowatts (4,610 hp) from a genset and a shaft-mounted ...