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Explanation: submarine tech that India wants

On April 30, the French Naval Group, one of Five Original Equipment Manufacturers (OEM) Shortlisted for Navy P-75 India (P-75I) project to build six conventional submarines within the country, announced will not be shown for The project. The reasonThis was the request, Naval Group said for The proposal (RFP) requires “that the AIP fuel cell be sea-mounted, which is not the case for us After that because the French Navy does use such payment system. “

AIP stands for Air Independent Propulsion, A technology for Conventional – ie, non-nuclear submarines.

What is P-75I project?

In June 1999, the Cabinet Committee on Security approved 30-year plan for local navy build and employ 24 submarines by 2030. In first phasetwo lines of Production was to be established – and first, P-75; The second, P-75I. Each line was to produce six submarines.

Contract for The P-75 . was signed in 2005 with Naval group, later known as DCNS, in partnership with Mazagon Dock Shipbuilders Ltd (MDL). The first Calvary-class (Scorpene-class) under the submarine project was commissioned in December 2017. Five more submarines were built where; The final OneVagsheer has been launched last month, and commissioning will take place by late 2023.

While the delivery of the P-75 was delayed, the P-75I experienced long delays even before it began off. The first Request for Information released in 2008 then again in 2010, but only the RFP was issued in July 2021.

This will be India first project Under the strategic partnership model – government will give The contract with the Indian Strategic Partner (SP), which will be a partner with A foreign OEM company to build AIP powered submarines in Country. MDL, Larsen and Toubro are the SP selected; The five OEMs selected are Naval Group (France), ThyssenKrupp Marine Systems (Germany), ROE (Russia), Daewoo Shipbuilding and Marine Engineering (South Korea) and Navantia (Spain).

what is the situation of The project?

Navy representative said before the Parliamentary Standing Committee on defense in 2019-20 “We are few behind the curve” on P-75I. The final Bidding – one All of SP in partnership with OEM – Not yet finished. The project Facing choppy water Naval group has already announced It pulls out, sources said, perhaps Russian and Spanish companies also don’t continue with their offers.

Among the concerns, Naval Group said, is the requirement to prove an AIP fuel cell installed at sea. While some manufacturers may have technology, may not have been proven at sea yet. Some analysts believe that while the RFP clear About these circumstances, is possible That OEMs were expecting certain concessions in The requirements In the end.

else problem for Sources said that OEMs is transport of technologyWhich built In operation under SP model. Sources believe that OEMs are unwilling to do so share All their expertise, especially specialized technologies that they have built.

As things stand, sources said, only ThyssenKrupp Marine Systems and the South Korean company appear to be the same. in fight. According to experts, even if things go smoothly here onwards, the closest file first The P-75I submarine can be commissioned around 2032.

Why Navy want AIP subs?

Issuance of a request for proposals last yearThe government She said she “envisions the original construction of six Modern traditional submarines (including associated beach supportEngineering support, training and spare parts package package) with Contemporary equipment, weapons and sensors including fuel cell based AIP (Air Independent Propulsion Plant), advanced torpedoes, modern missiles and state of The art Countermeasures systems.

AIP said, “She has force multiple effect on lethality of Diesel electric submarine as it enhances submerged endurance of The boat has several folds. AIP-based fuel cells have advantages in performance compared to others technologies. “

Simply, AIP technology allows conventional submarine for remain submerged for Much longer than normal diesel-electric submarines. All conventional submarines must surface run Their generators that recharge batteries allow The boat runs under water.

However, the more often submarine surfaces, and higher Opportunities of is detected. AIP allows submarine for remain submerged for more Two weeks, compared to two to three days for Diesel and electric boats.

while the six Installable P-75 diesel-electric submarines with AIP technology Later in their lives. By the time the P-75I is completed under 30-year projectIndia is expected to have six diesel and electric, six Powered by AIP and six nuclear attack Submarines (not yet done built).

India is developing AIP technology locally as well. Tablets of The Defense Research and Development Organization (DRDO) this year displayed the AIP Republic Day Parade. In March 2021, the Department of Defense said DRDO had achieved a “mission milestone in The development of Air Autonomous Propulsion (AIP) by Proving the Ground Model.” However, experts have certain doubts about the DRDO prototype of the AIP, and many fear that it may not even be ready by then. first Calvary class submarine comes for Renewal starting in 2024.

about 10 countries You have developed or close to building AIP technologyNearly 20 countries have AIP submarines.

What submarines does India have now?

India has 16 conventional diesel-electric submarines, which are designated SSKs. distance last Two Calvary-class submarines have been commissioned under the P-75, and that number will go up to 18. India also It has two nuclear and ballistic submarines, classified as SSBN.

Among the 16 SSKs, there are four of Shishomar Class, which was then purchased built in India in cooperation with Germans starting in the eighties. eight Kilo Class or Sindhughosh Class submarines purchased from Russia (including the former Soviet Union) between 1984 and 2000; And four of the Calvary class built in India in MDL.

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AIP Let conventional submarines stay submerged for Long

Diesel-electric submarines It should come to the surface or close to it run their generators to recharge the batteries that propel them underwater. AIP is a mechanism allows Batteries to be charged even while the boat is submerged. However, even with AIP, the submarine needs to surface every three weeks or so. According to an article published in 2015 on The website of The Australian Strategic Policy Institute (AIP), an independent strategic and defense think tank, offers the potential of Increased endurance underwater by a factor of up to 3 or 4, which reduces indiscretion significantly.”

There are different types of AIP . mechanisms available; What are you looking for in India? for Under the P-75I project It is AIP based on fuel cells. These cells convert chemical energy into electrical energy, and recharge the batteries of the submarine.

There are deposits on AIP. Australian newspaper says AIP installation increases height and weight of Boats, require pressurized liquid oxygen (LOX) storage on-board and supply for all three technologiesAlso, “MESMA and the Stirling Engine feature some acoustics noise from moving cutting; And the unit… the submarine cost [increases] about 10%.”


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Sallie Anderson
Sallie works as the Writer at World Weekly News. She likes to write about the latest trends going on in our world and share it with our readers.

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