Kolkata - class destroyer The Kolkata " - class ( Project 15A ) " are a class of guided - missile destroyer s constructed for the Indian Navy . The class comprises three ships - " Kolkata " , " Kochi " and " Chennai " , all of which are being built by Mazagon Dock Limited ( MDL ) in India , and are the largest destroyers to be operated by the Indian navy . Due to delays in their construction , and a problem found during the sea trials , the initial commissioning date of the first ship of the class has been pushed back from 2010 to 2014 . The destroyers are a follow - on of the Project 15 Delhi - class destroyer s , but are considerably more capable due to major improvements in the design , the addition of substantial land - attack capabilities , and the fitting - out of modern sensors and weapons systems . An even more enhanced version of the " Kolkata " - class - Project 15B - has been approved . Project 15B destroyers will feature enhanced stealth characteristics as well as incorporating state of the art weaponry and sensors including the extended range Barak surface - to - air missiles . Development . In 1986 , the Cabinet Committee on Political Affairs ( CCPA ) approved a follow - on class of the earlier Project 15 Delhi - class destroyers . The aim was that the follow - on class would incorporate a higher level of air - defence , land attack , anti - submarine and anti - ship capabilities than the preceding class . However , the Indian Navy did not initially take up the option . By the year 2000 , the Indian Navy had redesigned the follow - on " Kolkata " - class to incorporate even higher levels of technology - including modern stealth characteristics and in May of that year , approval for the construction was given . Concept and function for Project 15A was framed by the navy ' s Directorate of Naval Design , while the detailed design was developed by Mazagon Dock Limited ( MDL ) . Construction . Construction of three " Kolkata " - class ships was sanctioned by the Government of India in May 2000 , and steel for the lead ship was cut in March 2003 . Construction began in September 2003 at Mazagon Docks , Mumbai , with an initial expectation that the first of the class would be handed over to the navy by 2010 . However , since then the " Kolkata " - class has suffered consecutive delays , slow construction procedures and technical problems which will now see the first of the class now enter service during early 2014 . The delays in the construction programme have been attributed to - persistent design changes made by the Indian Navy to incorporate new weapons systems and sensors , failure by a Ukrainian shipyard to deliver the ship ' s propellers and shafts and the contract later being awarded to a Russian firm , and finally the delay in the delivery of the Barak 8 anti - air missiles , which are still in the final stages of completion with Israel Aerospace Industries and the Defence Research and Development Organisation . The " Kolkata " - class are the largest destroyers ever to be constructed at Mazagon Docks , and as of 2013 , all three ships of the class have been launched and are being fitted out . Technical problems were found during the sea trials of the lead ship " Kolkata " , which delayed the project by six months to early 2014 . Project 15B . In January 2011 , the Cabinet Committee on Security gave approval for a follow - on order of four more destroyers under Project 15B . Project 15B will retain the same hull as 15A " Kolkata " - class destroyers , but there will be significant changes in the superstructure that will improve the ships stealth characteristics ( flush deck ) , include better sound and infrared suppression systems and more sophisticated weaponry such as : Nirbhay land - attack cruise missiles , hypersonic BrahMos - II anti - ship missiles and Barak 8 - ER SAM s . They will operate two helicopters , and are expected to displace approximately 8 , 000 tonnes at full displacement ( 1200 tonnes more than 15A ) . Russia ' s Baltic Shipyard has been contracted to provide four sets of line shaft s by 2017 . Saint Petersburg ' s Northern Design Bureau was consulted during the design phase . The total cost of the project is expected to be . Build - time for Project 15B is expected to be shorter than 15A , as no major re - designing would be done and would require only one and a half years of planning . Due to this , each warship is expected to save US $ 1 billion in costs . After finalisation of design , the first destroyer is expected within four years , with the others delivered at annual intervals , starting from 2018 . Design and description . The " Kolkata " - class share similar dimensions to the previous " Dehli " - class , however with a standard displacement of and a full - load displacement of , they are the largest destroyers ever operated by the Indian Navy . These are the first stealth destroyers being built by India and marked a significant development in India ' s shipbuilding technology . The ships would incorporate modern weapons and sensors , and will have an advanced information warfare suite , an auxiliary control system with a sophisticated power distribution architecture , and modular crew quarters . The class have a length of , a beam of and a draft of . The ship ' s power and propulsion features a standard Combined gas and gas system utilizing twin Zorya M36E gas turbine plants and four DT - 59 reversible gas turbines . The class also features two KVM diesel engines . On - board Wartsila WCM - 1000 generators and Kirloskar AC generators supply the ship ' s electricity . The two propellers are run via two RG - 54 gearboxes . This configuration allows the ship to reach speeds in excess of . Aviation facilities include a large flight deck and an enclosed hangar for up to two maritime helicopters . The class is equipped with Thales LW - 08 long range volume search radar , EL / M - 2248 MF - STAR multi - mission AESA radar and EL / M - 2238 S - band STAR surveillance radar from Israel Aerospace Industries . A " Nagin " active towed array sonar and a HUMSA - NG ( hull - mounted sonar array - new generation ) are carried for sub - surface surveillance . To protect against anti - ship missiles coming from multiple directions , the ship carries the Elbit Systems Deseaver MK - II decoy control and launching system . The ship ' s main air - defence armament is composed of four 16 - cell vertical launching system s ( VLS ) allowing for a combination of up to 64 Barak 1 ( short - range ) and Barak 8 ( medium - range ) air - defence missiles . A typical load - out for - example may consist of 48 Barak - 8 missiles and 16 Barak - 1 missiles . In addition , four AK - 630 CIWS are fitted for close - in defence . The supersonic BrahMos anti - ship and land - attack missiles are the primary offensive armament of the " Kolkata " - class . The BrahMos missiles are fitted into a 16 - cell Universal Vertical Launcher Module ( UVLM ) allowing one missile per launch silo . Perhaps the most distinctive and noticeable armament of the " Kolkata " - class is its 130 mm naval gun located forward of the bridge . The 130 mm gun provides limited anti - shipping capability in addition to its naval gun fire - support role for land based operations . For anti - submarine warfare , the " Kolkata " - class are equipped with a torpedo launching system via four torpedo tubes and two RBU - 6000 anti - submarine rocket launchers . Ships of the class . Initially in 2008 , each vessel and its long - term spare parts was expected to cost , but the ship ' s construction costs escalated over 225 % during the course of their build , and by 2011 , cost of each warship became . The rising costs were the source of much controversy at the time , and the Defense Minister A . K . Antony cited the causes being the delay in supply of warship - grade steel by Russia , increase in costs of Russian specialists due to inflation during the build period , wage revision due from October 2003 and delay in finalisation of cost of weapons and sensors .