Kalvari-class submarine

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Not to be confused with Kalvari-class submarine (1967).
INS Kalvari at the Mazagon Dock Limited on the day of her undocking (4).JPG
INS Kalvari (S50)
Class overview
Name: Kalvari class
Builders: Mazagon Dock Limited
Operators:  Indian Navy
In service: 2015
In commission: September 2016
Building: 5
Planned: 6
Completed: 1
Active: 0
General characteristics
Type: Attack submarine
Displacement: 1,565 tonnes (1,725 short tons) (CM-2000)
Length: 61.7 m (202 ft) (CM-2000)
Beam: 6.2 m (20 ft)
Draught: 5.8 m (19 ft)
Propulsion: Diesel-electric, batteries, and AIP
Speed: 20 knots (37 km/h) (submerged)
12 kn (22 km/h) (surfaced)
Range: 6,500 nmi (12,000 km) at 8 kn (15 km/h) (surfaced)
550 nmi (1,020 km) at 5 kn (9.3 km/h) (submerged)
Endurance: 40 days (compact)
50 days (normal)
50+21 days (AIP)
Test depth: 350 metres (1,150 ft) [1]
Complement: 31
Armament: 6 x 533-mm torpedo tubes for 18 Black Shark heavyweight torpedoes/Varunastra torpedo or SM.39 Exocet antiship missiles, 30 mines in place of torpedoes

The Kalvari class is a class of submarines based on the Scorpène-class submarine built by Mazagon Dock Limited for the Indian Navy.

Project history[edit]

In 2005, India chose the Scorpène design; purchasing six submarines for US$3 billion ($500 million per boat) under the Project 75 (P75). The project was necessitated by the dwindling number of submarines in the Indian Navy. Indian Navy needed replacement for the older Sindhughosh (Kilo) and Shishumar (U209) class of submarines. The Scorpène design won the deal, defeating the rival U214 because of the capability to fire Exocet anti-ship missiles and an agreement on the air-independent propulsion (AIP).[2] The submarines are to be manufactured under a technology transfer agreement by the state-owned Mazagon Docks in Mumbai.[3] India plans to incorporate the DRDO-developed air independent propulsion (AIP) system onto the last two submarines being built and also to equip the P75I submarines, of which the DCNS is participating in the tender process.[4] Construction of the first submarine started on 23 May 2009. The project is running four years behind schedule. Once the new government under Prime Minister Narendra Modi took over, the project was reviewed and necessary action taken to make up for the delay.[5] As per the current schedule, the first Scorpène submarine will be delivered in September 2016, with the other five boats following at 10–12 months intervals each. The first Scorpène submarine, INS Kalvari (named after a deep sea tiger shark),[6] has been launched and she will start sea trials in 2015.[5] It was reported in November 2014, that the DRDO-developed AIP system for the last two Scorpène submarines for the Indian Navy has been developed and is ready for testing in February 2015.[7]

Ships of the class[edit]

Name Pennant Builder Launched Commissioned Status
INS Kalvari S50 Mazagon Dock Limited 2015[8] September 2016 Fitting-out
INS Khanderi S51 Mazagon Dock Limited
S52 S52 Mazagon Dock Limited
S53 S53 Mazagon Dock Limited
S54 S54 Mazagon Dock Limited
S55 S55 Mazagon Dock Limited


  1. ^ "Scorpene 1000". DCNS. Retrieved 8 April 2015. 
  2. ^ "Exocet Missiles, AIP Swing India Submarine Order". defense-aerospace.com. 13 September 2005. Retrieved 8 April 2015. 
  3. ^ "First Scorpene submarine to become reality soon". Deccan Herald. 27 August 2014. Retrieved 8 April 2015. 
  4. ^ Anandan, S. (25 March 2014). "DRDO developing onboard equipment monitoring system for submarines". The Hindu. Retrieved 8 April 2015. 
  5. ^ a b Pandit, Ranjat (28 August 2014). "Defence minister Arun Jaitley reviews delayed Scorpene submarine project". The Times of India. Retrieved 8 April 2014. 
  6. ^ Banerjee, Ajay (6 April 2015). "Parrikar undocks Scorpene sub". The Tribune. Retrieved 8 April 2015. 
  7. ^ "Indian-built Scorpene to carry critical DRDO system (Air Independent Propulsion)". DefenceRadar.com. 3 November 2014. Retrieved 8 April 2015. 
  8. ^ "India's First Scorpene Submarine Kalvari Undocked: A Major Milestone for Project 75". navy-recognition.com. 7 April 2015. Retrieved 3 May 2015.