Södermanland-class submarine

Swedish submarine class

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HSwMS Södermanland at sea

Class overview
Name| Södermanland class
Builders| Kockums
Operators|  Swedish Navy
Preceded by| Näcken class
Succeeded by| Gotland class
In commission| 1989–present
Planned| 4
Completed| 2
Cancelled| 2
Active| 1
Retired| 1
General characteristics
Displacement| Submerged: 1,500 t (1,500 long tons; 1,700 short tons)
Length| 60.5 m (198 ft 6 in)
Beam| 6.1 m (20 ft 0 in)
Draft| 5.6 m (18 ft 4 in)
Propulsion|

* 2 × Hedemora Diesel-electric engines
* 2 × Kockums v4-275R Stirling AIP units

Speed| Submerged: 20 kn (37 km/h; 23 mph)
Complement| 24
Sensors and
processing systems| FAS
Armament|

* 6 × 533 mm (21.0 in) torpedo tubes
* 3 × 400 mm (15.7 in) torpedo tubes
* Mines

The Swedish Södermanland class of diesel-electric submarines consists of HSwMS Södermanland and HSwMS Östergötland. These two submarines were originally launched as Västergötland-class submarines in 1987 and 1990, and were relaunched as a new class after extensive modernization in 2003 and 2004 by Kockums AB. The pressure hull had been cut in two after the sail and a 12 m (39 ft 4 in) long new section with an air-independent propulsion system was inserted. It contains two Stirling engines which are coupled to electric generators and heated by burning diesel fuel with liquid oxygen stored in cryogenic tanks. The AIP system can provide electric energy to extend the submarine's submerged time from days to weeks.

As of 2023[update], Södermanland is planned to remain in service until at least 2024-25 when it was to be replaced by the future Blekinge-class submarines.[1][2] However, the Östergötland was decommissioned in 2021, and is in material reserve.[3]

Two submarines of similar design, known as the Archer class are in service with the Republic of Singapore Navy.

## Units

[edit]

Ship name  | Laid down  | Launched  | Commissioned  | Service  | Status

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Södermanland |  | 12 April 1988  | 21 April 1989  | 1st Submarine Flotilla | Refitted 2003, Active[citation needed]; underwent life-extension and re-launched in 2024 allowing for service until 2030[4]
Östergötland |  | 9 December 1988  | 1989  | 1st Submarine Flotilla | Refitted 2004, Decommissioned 2021

## References

[edit]

1. ^ Karlberg, Lars Anders (12 April 2010). "Tolgfors beställer nya ubåtar och nya helikoptrar" (in Swedish). NyTeknik. Archived from the original on 16 June 2010. Retrieved 4 April 2015.
2. ^ "Saab, FMV, renegotiate A 26 submarine contract as costs rise, schedule slips". Janes.com. 31 August 2021. Retrieved 2023-04-29.
3. ^ "HMS SÖDERMANLAND" (in Swedish). Retrieved 2023-05-20.
4. ^ "Swedish Submarine Södermanland Re-Launched Following Lifetime Extension". 15 July 2024.

## Further reading

[edit]

* Darman, Peter, ed. (2004). Twenty-first Century Submarines and Warships. Military Handbooks. Rochester: Grange Books. ISBN 1-84013-678-2.
* Saunders, Stephen, ed. (2015). IHS Jane's Fighting Ships 2015-2016. Coulsdon, Surrey: Janes Information Group. ISBN 978-0-7106-3143-5.

## External links

[edit]

* Kockums page about the Södermanland class
* Kockums AIP Stirling system

* v
* t
* e

Saab Kockums

Ships|

* Blekinge-class submarine
* Archer-class submarine
* Bedok-class mine countermeasures vessel
* Collins-class submarine
* Gotland-class submarine
* HSwMS Orion
* Landsort-class mine countermeasures vessel
* Näcken-class submarine
* HSwMS Näcken
* HSwMS Neptun
* MT Frans Suell
* MV Sovetskaya Latviya
* Södermanland-class submarine
* Styrsö-class mine countermeasures vessel
* Unmanned surface vehicle Piraya
* Västergötland-class submarine
* Visby-class corvette
* HSwMS Artemis

Related|

* Kockums Crane

Active ships of the Swedish Navy

Corvettes|

| Stockholm class|

* Stockholm
* Malmö

|

Göteborg class|

* Gävle
* Sundsvall

Visby class|

* Visby
* Helsingborg
* Härnösand
* Nyköping
* Karlstad

Submarines|

| Gotland class|

* Gotland
* Uppland
* Halland

|

Södermanland class|

* Södermanland
* Östergötland

Mine countermeasures vessels|

| Styrsö class|

* Styrsö
* Spårö
* Skaftö
* Sturkö

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Koster class|

* Koster
* Kullen
* Vinga
* Ven
* Ulvön

Auxiliaries|

* Belos
* Carlskrona
* Orion
* Trossö

Authority control databases: Artists |

* KulturNav

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