Saab receives new order to upgrade the submarine Södermanland

According to a PR published by Saab on September 14, 2022, the firm has received new orders from FMV regarding submarine upgrades. The orders include a lifetime extension of HMS Södermanland, as well as new batteries and battery development. The total order value is SEK 470 million.
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Russian Vyborg Shipyard laid the Purga ice class coastguard ship of project 23550 925 001 Swedish Navy's Västergötland-class submarine HMS Södermanland (Picture source: Saab)

The lifetime extension means that the submarine HMS Södermanland will receive around 50 modifications, prolonging and enhancing her operability for a further six years.

The orders also include an exchange of batteries for the Swedish Navy's current submarine fleet, as well as a project focusing on battery development, to ensure capabilities both at present and long-term.

About the submarine HMS Södermanland

HSwMS Södermanland (Söd) is a Swedish naval submarine, launched in 1988 and currently in active service. She is the third ship of the Västergötland-class submarine and was named after Södermanland, Sweden.

Between 2000 and 2004, Södermanland and Östergötland underwent extensive modifications, were extended by 12 meters (39 ft), and fitted with air-independent Stirling engines.

The diesel-electric submarine has a length of 60.5 m (198 ft 6 in), a beam of 6.1 m (20 ft 0 in), and a displacement of 1,400 tons surfaced and 1,500 tons submerged.

The Södermanland class submarine is powered by a diesel-electric and Stirling AIP system integrating two Hedemora diesel-electric engines and two Kockums v4-275R Sterling AIP units.

The Swedish submarine can reach a top speed of 8 knots (15 km/h; 9.2 mph) surfaced and 15 knots (28 km/h; 17 mph) submerged. She is armed with six conventional 533 mm torpedo tubes and three 400 mm bow torpedo tubes.