Kronshtadt-class submarine chaser

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A Project 122bis Kronshtadt-class chaser in the service of the Albanian Naval Force
Class overview
Builders	Zelenodolsk shipbuilding yard No. 340
Operators	Soviet Navy  Albanian Naval Force  Bulgarian Navy  People's Liberation Army Navy  Cuban Revolutionary Navy  Indonesian Navy  Polish Navy  Romanian Naval Forces
Preceded by	SO1-class submarine chaser
Succeeded by	Poti-class corvette
Built	1945–1955
Completed	227
General characteristics
Class and type	Large submarine chasers since 1956 — Small anti-submarine ships
Displacement	289 (I series) / 302 (II series) ton standard, 325 (I series) / 337,7 tons full load
Length	52.24 m (171.4 ft)
Beam	6.55 m (21.5 ft)
Draft	2.2 m (7.2 ft)
Propulsion	3 diesel engines @ 3,600 hp (2,700 kW) "General Motors" (I series) / 3,300 hp (2,500 kW) "9D" (II series) with 3 shafts
Speed	20.5 knots (38.0 km/h) (I series) / 18.7 knots (34.6 km/h) (II series)
Range	4,800–6,500 km (2,600–3,500 nmi) at 22 km/h (12 kn)
Complement	50-54
Sensors and processing systems	Radar: 1 "Giuys-1" or "Zarya" (I series) / "Lin`" or/and "Neptun" (II series) search radar Sonar: 1 "Tamir-9" or "Tamir-10" or "Tamir-11" hull mounted high frequency active sonar
Armament	1 × 85 mm air defence gun M1939 (52-K) 2 × 37 mm automatic air defense gun M1939 (61-K) (2x1) 6 × "Colt-Browning" or 2M-1 12.7 mm heavy machine guns (2x3) (I series) 6 × 2M-7 14.5 mm (2x3) (last ships of II series) 2 depth charge rails (30 large & 30 small depth charges) 2 × BMB-1 or BMB-2 ASW mortars 2 × RBU (II series) or 2 x RBU-1200 (last ships of II series) Anti Submarine Warfare rocket launchers 16 Type 1908/39 mines (overload)
Armor	8 mm (conning tower)

Project 122bis (NATO codename Kronshtadt class) submarine chasers were a Soviet design which were exported throughout the communist bloc in the 1950s. The first ship, BO-270, was built at Zelenodolsk in 1945-1947 and a total of 227 were built for Soviet Navy (175) and border guard until 1955. As well as this, twenty Project 357 (Libau class) despatch vessels were built on the same hull, but were lightly armed.