Alta-class minesweeper

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M352 River Clyde.jpg
Norwegian Alta-class minesweeper Rauma (M352)
Class overview
Name: Alta class
Builders: Kværner Mandal, Mandal, Norway
Operators:  Royal Norwegian Navy
In commission: 1996–present
Completed: 5
Active: 2
Lost: 1
Retired: 1
General characteristics [1]
Type: Minesweeper
Displacement: 375 tonnes[2]
Length: 55.2 metres
Beam: 13.6 metres
Height: 21 metres
Draught: 2.5 metres
Speed: 30 knots (56 km/h; 35 mph)
Range: 1,500 mi (2,400 km)
Complement: 32
Sensors and
processing systems:

The Alta class is a ship class of minesweepers operated by the Royal Norwegian Navy. An almost identical class of minehunters is known as the Oksøy class.


The Alta class was built by Kværner Mandal during 1996 and 1997, while the related Oksøy class was built in 1994 and 1995. A total of 9 vessels were built, 5 minesweepers and 4 minehunters. The catamaran hull is built in a fibre-reinforced plastic sandwich of very low magnetic signature.[3]

Two large fans located on each side create an air cushion between the two hulls and a front and aft rubber skirt, lifting the vessel, giving small drag and a high cruise speed, as well as low susceptibility to the shock of exploding mines since only a small portion of the hull is actually exposed in the water. Propulsion by water jet, again one in each hull, gives a low acoustic signature. A degaussing system gives the vessels extremely low electromagnetic signature.


Alta class[4]
Number Name Builder Commissioned Status
KNM Orkla burning outside Ålesund, Norway in November 2002.
M350 Alta Kværner, Mandal 12 January 1996
M351 Otra 8 November 1996
M352 Rauma 2 December 1996
M353 Orkla Destroyed by fire on 19 November 2002[5]
M354 Glomma 1 July 1997 Sold 2009[6]

Service history[edit]

Orkla was destroyed by fire on 19 November 2002.[5] Glomma is no longer in active service.


  1. ^ "Oksoy and Alta Class Minesweepers and Minehunters - Naval Technology". Archived from the original on 17 March 2010. Retrieved 2 March 2010.
  2. ^
  3. ^ "Kongsberg to Supply MINESNIPER Mk III Mine Disposal Weapon System to Royal Norwegian Navy". September 20, 2013.
  4. ^ Stephen Saunders, ed. (2004). Jane's Fighting Ships, 2004-2005. London: Jane's Information Group. p. 517. ISBN 0710626231.
  5. ^ a b ""Orkla" har kantret". Bergensavisen (in Norwegian). 26 January 2003. Retrieved 29 March 2015.
  6. ^ "Sold warships". Retrieved 15 March 2020.

External links[edit]