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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, Södermanland is planned to remain in service until at least 2024-25 when it was to be replaced by the future Blekinge-class submarines. However, the Östergötland was decommissioned in 2021, and is in material reserve.

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

Units

References

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.

External links

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

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 Koster class Koster Kullen Vinga Ven Ulvön
Auxiliaries	Belos Carlskrona Orion Trossö

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