The internal plan of Indian navy for 2030 clearly states that IN will have a fleet of 30 SSKs out of which 24 will be outright modern submarines.
The line mix planned was initially
P 75- 6 subs
P 75I - 6 Subs
Indigenous SSK - 12 subs.
Below are few excerpts from Indian Navy dox.
View attachment 330934
looking at the present status of P75I and Indigenous SSK design being not finalised, the proposal has changed to
P75 - 6+3+3 ~ 9-12
P75I - 6+3+3~ 6-12
indigenous SSK - 3+3+3+3~ 3-6~9-12
The reasoning for 10-12 submarine order point is below
View attachment 330937
View attachment 330945
Some serious points
- There are serious question raised recently in April 2016 when all this talk started going very serious.
- First thing, the indigenous designed SSK needs to be in one of the two lines made for submarines in India.
- As of now only MDL has two lines available out of which second assembling line has parallel capacity to produce 5 submarines all at once.
- There is no other public or private sector which has been identified as of now by MOD/GOI whom it has indicated to go for such a technology absorption as no new tender and order has been given till date
- This is the tale tell sign of SSK not matured enough for an urgent need for a new line space nor P75I being close to tender process.
Now why more scorpenes (form the same IN dox)
- Scorpene submarine is constructed by joining five sections.
- The construction process starts with the fabrication of ring frames, followed by plate forming.
- Further, they are assembled into sub sections which in turn form the 5 major sections of the submarine.
- While the sections are being manufactured, a parallel activity of outfitting of cradles with equipment is progressed.
- Thereafter, the cradles are shipped inside the sections.
- Further, the sections are lowered onto the submarine launch pontoon in dry dock followed by the boot together which is the joining of the last two sections completing the submarine construction.
- A schematic representation of the same and photographs of cardinal activities are given below
View attachment 330953
View attachment 330954
View attachment 330955
- On completion of the above process of construction, the submarine is launched and undergoes STW inspections, harbour trials of various systems, followed by sea trials.
- On an average, it takes about 6 years (pie chart highlighting the duration placed below) for the whole process to complete which justifies the present status of the Project 75 where the first submarine is under preparation for sea trials.
- The second submarine is fully integrated and is undergoing preparation for launch.
- The remaining 4 submarines are at various stages of structural outfitting
Now what we learned and i quote
- MDL and Naval personnel have gained tremendous knowledge and expertise in the various stringent standards applicable for welding processes, geometrical measurements, welding inspection including NDT (non destructive testing) procedures and acceptance/rejection criteria.
- Extensive welder qualification in Major Metal Arc Welding processes to build pressure hull structures was also undertaken during the course of the project which added to the technical skills of the MDL workforce.
- Another important aspect which facilitated training of personnel in the private sector industries was during the outsourcing of a variety of jobs related to submarine construction.
- We have better command now to critically use the technologies and develop superior construction philosophy to suit our shipyards and manpower.
- Some of the critical items where significant progress in indigenization has been made are the weld consumables, ventilation coamings, RO plant, cables, anechoic tiles, GRP casing panels, main batteries etc.
- Certain equipment like thrust block, hydraulic blocks, hydraulic plungers for hydroplanes etc the equipment was imported from OEMs in raw form but was machined in India through identified companies.
- During the course of the indigenization process, it was also observed that some of the imported material which were procured from foreign firms could be sourced with ease from within India.
- In this phase of indigenization experience, we were able to analyze the entire plethora of material required for submarine construction and conclude that setting up production facilities for certain material may not be cost beneficial.
- For example, indigenization of steel. The quantum of infrastructure and research development required for producing a specific micro alloy steel like HLES 80 used for scorpenes is going to be phenomenal considering the fact that an entire facility needs to be set up for manufacture of a specific grade of steel.
Thus, these are some of the simple points which i can publicly quote here. The pros outweighs the cons..
I pasted a figure in the scorpene leak thread
https://defence.pk/threads/sensitive-data-of-indian-navy’s-scorpene-class-submarines-leaked.445677/page-46#post-8631675
If you look closely you will understand what its showing and why IN is clear about their plan and what they are trying to do.
@Abingdonboy @anant_s @Nilgiri @Vergennes @MilSpec @nair @SpArK @BON PLAN @Ankit Kumar 002 @GuardianRED