Henry Christoffersen

Henry Christoffersen is a shallow draft pusher tug built to operate on Canada's Mackenzie River. She was launched in 1973, and was the name ship of her class. She was designed by the Robert Allan Ltd. ship architects.[1][2] She was built in Esquimalt, BC at a shipyard known as Burrard Yarrows.[3]

Like other pusher tugs, she has a tower, with a steering bridge, that rises high above her conventional bridge, to help navigate, when she is pushing a line of barges.[1] She displaces 783 tons, and has a draft of just one metre.[2] Her four propellers are mounted in tubes.[4] Each is powered by an 839-horsepower diesel engine.[5]

She has accommodations for thirteen crew members and five supernumaries or passengers.[6]

In addition to towing barges loaded with cargo the Henry Christoffersen gets chartered to support survey expeditions.[7] In 2003 she towed ground penetrating sonar equipment throughout the Mackenzie Delta. In 2007-2008 she was part of a survey of the Beaufort Sea, off Alaska.[6]

References
  1. "Robert Allan Ltd. celebrates 80 years of successful ship designs". Robert Allan Ltd. 2010-04-26. Retrieved 2018-08-23. Robert Allan Ltd. was responsible for the development of many innovative, pioneering designs for these regions, including the original Canmar Suppliers (I-IV), Ikaluk and Miscaroo, Beaufort Sea Explorer, and the Northern Transportation Co. Ltd. (NTCL) mainline river tugs Henry Christoffersen, Matt Berry, et al.
  2. "Our Commitments". Robert Allan Ltd. Retrieved 2018-08-23.
  3. "Yarrows Ltd., Esquimalt BC". shipbuildinghistory. 2015-02-22. Retrieved 2018-08-23.
  4. "Technology: New Nozzles Improve Northern Tug". Marine Link. 2003-10-01. Retrieved 2018-08-23. Originally designed by Robert Alllan Ltd. (RAL) and built in the 1973, the 153 foot long Edgar Kotokak had, as her sistership the Henry Christoffersen still does, four open propellers in tunnels for propulsion with twin, transom hung rudders behind each prop for steering. The other tugs, the Kelly Ovayuak and Jock McNiven, use four Kort Nozzles in tunnels, each with twin rudders aft inside the tunnel. All the tugs originally had the same engines.
  5. Chris E. Mulder, Patrick Williams. "Improving the Performance of Shallow Draft Tugs in Northern Canada" (PDF). Retrieved 2018-08-23.
  6. Patrick Burden, Leah Cuyno, Stephen Thistle (2012-05-31). "MAG-PLAN Alaska Update" (PDF). U.S. Department of the Interior. Retrieved 2018-08-23. The Henry Christoffersen has accommodations for 13 crew and 5 other persons.CS1 maint: multiple names: authors list (link)
  7. "PUBLIC REVIEW of WESTERNGECO MACKENZIE DELTA MARINE 2D SEISMIC PROGRAM 2003" (PDF). Robert Allan Ltd. Retrieved 2018-08-23. A Northern Transportation Company Limited (NTCL) tug, the Henry Christoffersen, will tow a 1500 inch3 airgun array which will be fired at ten second intervals to provide an energy source. The vessel will also tow a solid streamer cable, up to two km long, equipped with recording hydrophones.
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