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Mafuta (ship)

(Redirected from Dock Express 20)

The Mafuta is a diamond-mining ship owned and operated by De Beers in the western coast of South Africa.[11] Built in 1983 as Dock Express 20 for Dock Express Shipping (later Dockwise), the semisubmersible, multirole, heavy-lift vessel was converted to the world's largest cable layer in 1993.[9] In 2005, she was purchased by De Beers, and converted to a subsea diamond-mining ship by A&P Tyne over the course of 11 months. The ship's new name, Peace in Africa, may have implied that it was providing an alternative to blood diamonds.[6][12] In 2013, still under ownership of De Beers Marine Namibia, the vessel was renamed to MV Mafuta.

Peace in Africa during the 2006 refitting on the Tyne.
History
Name
  • Dock Express 20 (1983–2006)
  • Peace in Africa (2006–2013)
  • Mafuta (2013-)[1]
Owner
Port of registry
BuilderVerolme Shipyard Heusden, Netherlands[3]
Yard number994[3]
Laid down1982[4]
Launched12 November 1982[4]
CompletedMay 1983[4]
Identification
StatusIn service[5]
General characteristics (as built)[3]
TypeHeavy lift ship
Tonnage
Length
  • LOA 169.52 m (556.2 ft)
  • LPP 126.50 m (415.0 ft)
Beam24.20 m (79.4 ft)
Draught8.9 m (29.2 ft)
Depth15 m (49.2 ft)
Main engines2 × Stork-Werkspoor 6TM410[4] (2 × 3,128 kW[7])
Auxiliary engines2 × 600 kW
Propulsion
Speed16 kn (30 km/h; 18 mph)
Capacity2,576 m2 (27,730 sq ft) cargo deck
Crew24
General characteristics (1993)[8]
TypeCable ship
Displacement21,731 tons
Draught8.79 m (28.8 ft)
PropulsionAzimuth thrusters (3 × 1,325 kW)[7]
Speed12.5 knots (23.2 km/h; 14.4 mph)
Range20,500 nautical miles (38,000 km; 23,600 mi)
Capacity10,000 tons of cable, 100 repeaters
Crew85[9]
General characteristics (2007)[5]
TypeDredger
Tonnage
Crew68[10]

Construction

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Then named Dock Express 20, the ship's keel was laid in 1982 in the Netherlands at Verolme Shipyard Heusden, and it was launched the following year. Originally a heavy-lift ship, it has an overall length of 169.52 m (556.2 ft). The ship has a beam (width) of 24.20 m (79.4 ft). Her height from the top of the keel to the main deck, called the moulded depth, is 15 m (49 ft).[13]

The ship's gross tonnage, a measure of the volume of all its enclosed spaces, is 14,793 m3. Its net tonnage, which measures the volume of the cargo spaces, is 4,437 m3. Its total carrying capacity in terms of weight, is 14,617 long tons deadweight (DWT), the equivalent of roughly 300 adult male sperm whales.[14]

Dock Express 20 was powered by two Stork-Werkspoor 6TM410 four-stroke, medium-speed, marine diesel engines of 3,128 kW (4,195 hp) apiece. Each engine powered an independent controllable-pitch propeller. This main propulsion system was able to move the ship at 16 knots (30 km/h; 18 mph). For harbour maneuvering, the vessel was also fitted with a 625 kW bow thruster. In addition, the ship has two 600-kilowatt (800 hp) auxiliary generators to provide shipboard electrical power. When the Dock Express 20 was converted to a dynamically positioned cable ship, she was refitted with three 1,325 kilowatts (1,777 hp) azimuth thrusters to serve as its main propulsion.[citation needed]

Dock Express 20 was originally built to house 24 crewmembers, but that number was more than tripled in the 1993 conversion. In 2007, the ship was converted again to work as a dredger, increasing the gross tonnage to 15,854, and the deadweight tonnage to 7,935 long tons.[citation needed]

Career

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Early career

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Dock Express 20 was built for use in the offshore oil industry.[15]

The Dock Express 20 was involved in the sinking of the tugboat Terminator some 20 mi (32 km) off the coast of California on 27 January 1992. Following an engine failure, the heavy seas pushed the tugboat against one of the protruding stern sponsons of the heavy-lift vessel, causing enough damage to sink the vessel in 25 minutes. The crew evacuated to a life raft and was picked up by another ship.[16]

Cable layer

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The ship was converted to a cable layer by Tyco Submarine Systems, and worked under charter to this company.[15]

Dock Express 20 is pictured on the Russian postcard commemorating a submarine cable between Denmark and Russia. The ship laid a 1,200 km (750 mi) cable from Copenhagen to Kingiseppe, which connects via microwave to Moscow and St. Petersburg.[17]

Dock Express 20 was one of three ships that worked on the northern section of the Pacific Crossing-1 (PC-1) system cable, linking the United States and Japan.[18] It also laid telecommunications cable between San Francisco and Guam.[19]

Diamond mining

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Departing for sea trials near the end of the 2006 refit

As of 2011, Peace in Africa was operating off the coast of Namaqualand in underwater diamond mining.[20] Its ML3 mining license, according to a 2007 report, began about 5 km offshore of Kleinzee, running north to Alexander Bay, Northern Cape, and extended seaward for 17–32 km. Prior to 2007, the ship had operated in the neighboring Atlantic 1 licence area in Namibia, which contained higher-quality diamonds.[21]

The dredging equipment aboard Peace in Africa includes a 240-ton crawler, described as "a large undersea tracked mining tool" connected to the ship by a 655-mm internal diameter rubber hose, and a "diamond recovery treatment plant" built by Bateman Engineering.[20][22] The dredge has a suction capacity of about 10,000 m3 of water and gravel per hour, resulting in about 250 tons of material to be processed for diamonds.[21] The anticipated yield is around 60 diamonds per hour, or roughly 240,000 carats annually.[22]

Peace in Africa was the second-largest ship registered in South Africa, and worked on a continuous, round-the-clock basis, as of 2007. Its mining operation was projected to have a lifespan of 19 years.[21]

As of 2006, De Beers Marine Namibia was operating five mining vessels, including Peace in Africa.[11]

Peace in Africa appeared in a 2009 episode of the Discovery Channel's documentary series Mighty Ships.[23][24]

In 2013, still under ownership of De Beers Marine Namibia, the vessel was renamed to MV Mafuta.[25]

References

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  1. ^ a b Dockwise. Tussen Hoek en Stad. Retrieved 2011-08-30
  2. ^ a b "Dock Express 20 (270429)". Port State Information Exchange. United States Coast Guard. Retrieved 20 May 2013.
  3. ^ a b c NB994 Dock Express 20 Archived 4 October 2011 at the Wayback Machine. Shipyard De Hoop. Retrieved 2011-08-30
  4. ^ a b c d DOCK EXPRESS 20 (Google Cache). 10 June 2005.
  5. ^ a b c "Peace in Africa (8125064)". Equasis. Ministry of Ecology, Sustainable Development and Energy. Retrieved 30 August 2011.
  6. ^ a b Sea State Alarm trial on cable ship Dock Express 20. Breeman Engineering and Services bv. Retrieved 2011-08-30
  7. ^ General features of optical fibre submarine cable systems Archived 7 October 2011 at the Wayback Machine. ITU-T Recommendation G.971, 04/2000. Retrieved 2011-08-30
  8. ^ a b Brown, Nicholas. Dutch ships lay Tyco cable. Seacoastonline.com, 21 June 2002. Retrieved 2011-08-30
  9. ^ Sharda (4 August 2011). "Mining Ship MV Peace in Africa : The Diamond Hunter". Marine Insight. Retrieved 29 August 2011.
  10. ^ a b Creamer Media Reporter (4 May 2007). "New mining vessel boasts latest technology". Creamer Media's Mining Weekly.com. Retrieved 29 August 2011.
  11. ^ Choo, Yoo Sang; Edelson, David N. (2008). Marine Operations Specialty Symposium. Research Publishing Services.
  12. ^ "International Convention on Tonnage Measurement of Ships, 1969". International Conventions. Admiralty and Maritime Law Guide. 23 June 1969. Retrieved 1 September 2011.
  13. ^ Shirihai, H. & Jarrett, B. (2006). Whales Dolphins and Other Marine Mammals of the World. Princeton: Princeton Univ. Press. pp. 21–24. ISBN 978-0-691-12757-6.
  14. ^ a b "Dock Express 20 – IMO 8125064". Shipspotting.com. 2011. Retrieved 30 August 2011.
  15. ^ US Coast Guard Marine Casualty investigation MC93011836 and Marine Violation investigation MV92003258.
  16. ^ Glover, Bill (2005). "History of the Atlantic Cable & Undersea Communications from the first submarine cable of 1850 to the worldwide fibre optic network Cable Stamps – ANZCAN, SCOTICECAN, Bermuda-Tortola, Denmark-Russia, Isle of Man-UK". History of the Atlantic Cable & Undersea Communications from the first submarine cable of 1850 to the worldwide fibre optic network. Retrieved 30 August 2011.
  17. ^ "Tyco Submarine Systems Provides the World's Most Advanced Transoceanic Network 3-Months Ahead of Contract Schedule – Company Business and Marketing". 3 January 2000. Retrieved 30 August 2011 – via Find Articles / Technology / Cambridge Telcom Report.
  18. ^ Brugghe, Patrick (2000). "A metocean case study, How satellite measurements of wave heights can improve the decision-making process on board a ship carrying out a mission sensitive to sea conditions". Retrieved 30 August 2011.
  19. ^ a b Van de Velde, Marc. "Marine diamond mining vessel "Peace in Africa"". The Art of Dredging. Retrieved 29 August 2011.
  20. ^ a b c "Debmarines sea diamonds success". Cape Business News. August 2007. Archived from the original on 28 September 2011. Retrieved 31 August 2011.
  21. ^ a b Kruger, Tessa (21 April 2007). "De Beers launches its first South African marine diamond mining vessel". Mineweb.com. Retrieved 29 August 2011.
  22. ^ "Peace in Africa - Mighty Ships (Season 2, Episode 2) - Apple TV". Apple TV. 2 August 2016. Retrieved 25 June 2024.
  23. ^ "Mighty Ships: Peace in Africa". Smithsonian Libraries and Archives. Smithsonian Institution. Retrieved 25 June 2024.
  24. ^ Blauer, Ettagale. "Rapaport Magazine - Diamonds in the Ocean". Rapaport Magazine. Rapaport. Retrieved 25 June 2024.
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