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    Project 885: Yasen class

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    magnumcromagnon
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    Re: Project 885: Yasen class

    Post  magnumcromagnon on Tue Oct 04, 2016 6:56 pm

    To be fair, as Mindstorm has stated, they're basically quoting the National Interest, even the more respected Russian language sources on Russian military equipment, have been seen recently quoting the National Interest (Gurkhan, vpk.name, vpk-news.ru, sila.rg.ru).
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    Re: Project 885: Yasen class

    Post  RTN on Tue Oct 04, 2016 8:48 pm

    Mindstorm wrote:If only they would truly realize how much in the reality (instead of theirs phantasious universe) they have fallen behind in the wide majority of most critical military related scientifical sectors   Rolling Eyes    

    The US has fallen behind Russia in "wide majority of most critical military related scientifical sectors" ? ? ?

    Which sectors are these, I dare ask  coz even the Russian President has never made such a chest thumping, misleading claim.
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    Re: Project 885: Yasen class

    Post  x_54_u43 on Tue Oct 04, 2016 10:12 pm

    RTN wrote:
    Mindstorm wrote:If only they would truly realize how much in the reality (instead of theirs phantasious universe) they have fallen behind in the wide majority of most critical military related scientifical sectors   Rolling Eyes    

    The US has fallen behind Russia in "wide majority of most critical military related scientifical sectors" ? ? ?

    Which sectors are these, I dare ask  coz even the Russian President has never made such a chest thumping, misleading claim.

    I wish to know what advantages Yasen has over other subs, it really is interesting.
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    Re: Project 885: Yasen class

    Post  George1 on Mon Jan 23, 2017 8:21 pm

    Russia’s 4th Yasen-class submarine completes hydraulic tests

    The first Project 885 nuclear submarine Severodvinsk was delivered to the Russian Navy in 2014

    MOSCOW, January 23. /TASS/. The fourth Project Yasen-M multipurpose nuclear submarine Krasnoyarsk has completed hydraulic tests of the pressure hull and its structures, the Sevmash Shipyard, the submarine’s manufacturer, told journalists.

    "A major construction stage - the hydraulic tests of the strong hull and its elements - has been completed on the nuclear submarine Krasnoyarsk. The submarine has successfully passed the tightness test and its hull has withstood the characteristics laid out by the designer. Further planned work is ongoing to prepare the hull for insulation and assembly works," the Sevmash Shipyard press office said.

    The Krasnoyarsk is the fourth multipurpose nuclear-powered submarine in the Yasen-class series (Project 885) designed by the St. Petersburg-based Marine Engineering Design Bureau Malakhit. The submarine was laid out in 2014. Overall, five submarines of this project are under construction at the Sevmash Shipyard in Severodvinsk in north Russia.

    The first Project 885 nuclear submarine Severodvinsk was delivered to the Russian Navy on June 17, 2014 and underwent operational evaluation until the spring of 2016. The other submarines are being built under the improved Yasen-M project.


    More:
    http://tass.com/defense/926821


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    Re: Project 885: Yasen class

    Post  Singular_Transform on Tue Jan 24, 2017 7:49 am

    And what's about the Kazan?

    And this information carry small useful information. - however it can be expected .
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    Re: Project 885: Yasen class

    Post  KomissarBojanchev on Tue Jan 24, 2017 8:17 am

    When will we see pictures of the Kazan?
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    Re: Project 885: Yasen class

    Post  Singular_Transform on Tue Jan 24, 2017 9:27 pm

    George1 wrote:

    "A major construction stage - the hydraulic tests of the strong hull and its elements - has been completed on the nuclear submarine Krasnoyarsk. The submarine has successfully passed the tightness test and its hull has withstood the characteristics laid out by the designer. Further planned work is ongoing to prepare the hull for insulation and assembly works," the Sevmash Shipyard press office said.


    Actually ,there is something interesting.

    They have a full sized high pressure test chamber for nuclear submarines?
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    Re: Project 885: Yasen class

    Post  Big_Gazza on Wed Jan 25, 2017 1:51 am

    Singular_Transform wrote:
    George1 wrote:

    "A major construction stage - the hydraulic tests of the strong hull and its elements - has been completed on the nuclear submarine Krasnoyarsk. The submarine has successfully passed the tightness test and its hull has withstood the characteristics laid out by the designer. Further planned work is ongoing to prepare the hull for insulation and assembly works," the Sevmash Shipyard press office said.


    Actually ,there is something interesting.

    They have a full sized high pressure test chamber for nuclear submarines?

    A hyperbaric test chamber for a complete submarine hull? No chance... Maybe they perform a hydrostatic test where they fill the hull with water and apply test pressure? I know the pressure application is reversed compared to normal operating but such a test must give some assurance that plates and welds are all up to spec....

    Its a good question and i'd love to know the answer.
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    Re: Project 885: Yasen class

    Post  Militarov on Wed Jan 25, 2017 3:40 am

    Singular_Transform wrote:
    George1 wrote:

    "A major construction stage - the hydraulic tests of the strong hull and its elements - has been completed on the nuclear submarine Krasnoyarsk. The submarine has successfully passed the tightness test and its hull has withstood the characteristics laid out by the designer. Further planned work is ongoing to prepare the hull for insulation and assembly works," the Sevmash Shipyard press office said.


    Actually ,there is something interesting.

    They have a full sized high pressure test chamber for nuclear submarines?

    No.
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    Re: Project 885: Yasen class

    Post  Singular_Transform on Wed Jan 25, 2017 6:53 pm

    Big_Gazza wrote:
    Singular_Transform wrote:
    George1 wrote:

    "A major construction stage - the hydraulic tests of the strong hull and its elements - has been completed on the nuclear submarine Krasnoyarsk. The submarine has successfully passed the tightness test and its hull has withstood the characteristics laid out by the designer. Further planned work is ongoing to prepare the hull for insulation and assembly works," the Sevmash Shipyard press office said.


    Actually ,there is something interesting.

    They have a full sized high pressure test chamber for nuclear submarines?

    A hyperbaric test chamber for a complete submarine hull? No chance... Maybe they perform a hydrostatic test where they fill the hull with water and apply test pressure? I know the pressure application is reversed compared to normal operating but such a test must give some assurance that plates and welds are all up to spec....

    Its a good question and i'd love to know the answer.


    The test chamber is not impossible, but very expensive, minimum weight of it is above 60 000 tons.

    The factory layout doesn't showing anything that can be used as a test chamber for submarines.


    The air is a more practical medium to pressurize the hull, however it is a bit more dangerous than the water.

    Maybe the hydraulic test is workshop slang ?

    Anyway, as I see the cheapest method to test the welding should be to wallpaper the hull and the beams with strain gauges, vacuum the hull, it can give a good indication of the geometrical problems to fix - simply scale up the strains in the beams to the crush deep .
    If the submarine pass it then they can test the welding integrity by overpressurize the hull to the crush deep.

    When they weld the hull then all stuff should be in the internal that has to be there, means the water is not an ideal medium to test the integrity.
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    Re: Project 885: Yasen class

    Post  Big_Gazza on Thu Jan 26, 2017 5:31 am

    Singular_Transform wrote:
    Big_Gazza wrote:
    Singular_Transform wrote:
    George1 wrote:

    "A major construction stage - the hydraulic tests of the strong hull and its elements - has been completed on the nuclear submarine Krasnoyarsk. The submarine has successfully passed the tightness test and its hull has withstood the characteristics laid out by the designer. Further planned work is ongoing to prepare the hull for insulation and assembly works," the Sevmash Shipyard press office said.


    Actually ,there is something interesting.

    They have a full sized high pressure test chamber for nuclear submarines?

    A hyperbaric test chamber for a complete submarine hull?  No chance...  Maybe they perform a hydrostatic test where they fill the hull with water and apply test pressure?  I know the pressure application is reversed compared to normal operating but such a test must give some assurance that plates and welds are all up to spec....

    Its a good question and i'd love to know the answer.


    The test chamber is not impossible, but very expensive, minimum weight of it is above 60 000 tons.

    The factory layout doesn't showing anything that can be used as a test chamber for submarines.


    The air is a more practical medium to pressurize the hull, however it is a bit more dangerous than the water.

    Maybe the hydraulic test is workshop slang ?

    Anyway, as I see the cheapest method to test the welding should be to wallpaper the hull and the beams with strain gauges, vacuum the hull, it can give a good indication of the geometrical problems to fix - simply scale up the strains in the beams to the crush deep  .
    If the submarine pass it then they can test the welding integrity by overpressurize  the hull to the crush deep.

    When they weld the hull then all stuff should be in the internal that has to be there, means the water is not an ideal medium to test the integrity.

    Hyperbaric testing by vacuum within the hull will be limited to only 1 bar/atm differential pressure, unless it is somehow combined with external pressure (ie within a pressurised habitat). Either way, a few bar is the best you could achieve, ie 20-30m operating depth, and I doubt you could extrapolate the test data to determine behaviour at max depth with any accuracy.

    A test chamber for a full hyperbaric test would need to withstand 1 bar per 10m water depth, so lets say 100bar for 1000m. That requires a LOT of steel.... Testing would have to be done with water, as it would simply be too dangerous with air. Air being compressible, stores energy as pressure increases, and any loss of containment would result in sudden release of that energy that would be lethal. Water in incompressible, so the only stored energy is in the walls of the test chamber (ie as elastic potential energy as the vessel expands under the applied pressure). Sudden loss of pressure due to rupture releases much less energy, several orders of magnitude less when compared with air.
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    Re: Project 885: Yasen class

    Post  Singular_Transform on Thu Jan 26, 2017 7:11 pm

    Big_Gazza wrote:

    Hyperbaric testing by vacuum within the hull will be limited to only 1 bar/atm differential pressure, unless it is somehow combined with external pressure (ie within a pressurised habitat). Either way, a few bar is the best you could achieve, ie 20-30m operating depth, and I doubt you could extrapolate the test data to determine behaviour at max depth with any accuracy.

    A test chamber for a full hyperbaric test would need to withstand 1 bar per 10m water depth, so lets say 100bar for 1000m. That requires a LOT of steel.... Testing would have to be done with water, as it would simply be too dangerous with air. Air being compressible, stores energy as pressure increases, and any loss of containment would result in sudden release of that energy that would be lethal. Water in incompressible, so the only stored energy is in the walls of the test chamber (ie as elastic potential energy as the vessel expands under the applied pressure). Sudden loss of pressure due to rupture releases much less energy, several orders of magnitude less when compared with air.

    The submarine hull has to be tested for geometry errors, and for welding/material errors.

    Second can be done with simple overpressure.

    However the geometrical error can be sorted only with very precise measurement of the geometry of the whole hull (don't think it is possible) or more probable wallpapering the ship with strain gauges, and first vacuum it, after overpressure it.


    Example: an inflated balloon can withstand the internal pressure, but immediately collapse if there is any level of relative internal vacuum.

    The most important parameter of the submarine body is the local curvature. If the radius is too big, then the given area will collapse under external pressure.

    However if the internal is pressurized then the given area will simply deformate.

    Means they have to use strain gauges, it can't be avoided.

    _The -1 bar will give same idea about the geometrical errors, and with the +100 bar test it will give same good indication about the shape of the hull.

    The water (or any liquid ,as a matter of fact) ideal candidate for ressure test, the problem is it wet, means if there is any equipment in the hull ( like if you welded it together) then you can't use it.
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    Re: Project 885: Yasen class

    Post  Rmf on Thu Jan 26, 2017 10:50 pm

    tested pumbing and some smaller components ,propeller axle & submarine movable joint ,etc.
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    Re: Project 885: Yasen class

    Post  Singular_Transform on Fri Jan 27, 2017 8:56 pm

    Rmf wrote:tested pumbing and some smaller components ,propeller axle & submarine movable joint ,etc.


    Doesn't sound as an impressive milestone.
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    Re: Project 885: Yasen class

    Post  hoom on Sun Feb 19, 2017 6:33 am

    Via r/WarshipPorn Severodvinsk in dry dock, apparently recent


    Edit: Here's a pretty shot via Keypublishing but its from Balancer forum.
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    Re: Project 885: Yasen class

    Post  George1 on Tue Mar 14, 2017 12:05 pm

    Second Yasen-class nuclear submarine to be put afloat on March 30

    The second Yasen-class multipurpose nuclear-powered submarine Kazan will be put afloat in Russia's Severodvinsk on March 30

    MOSCOW, March 14. /TASS/. The second Yasen-class multipurpose nuclear-powered submarine Kazan will be put afloat in Severodvinsk on March 30, a source in the Russian military-industrial complex informed TASS.

    "Kazan is expected to be rolled out and put afloat on March 30," he said.

    "Kazan" has been built at the Sevmash shipyard in Severodvinsk, a port city in Russia’s White Sea, since 2009. This is the second Yasen-class submarine and first submarine built under the upgraded project 885M. A source at Sevmash earlier told TASS that "Kazan" would be transferred to the Russian Navy in 2018.

    The Yasen-class nuclear-powered multi-purpose submarines have been designed by the St. Petersburg Malakhit (Malachite) Marine Engineering Bureau. The first Project 885 submarine cruiser "Severodvinsk" was transfer to the Russian Navy on June 17, 2014.

    The multipurpose nuclear-powered submarines "Kazan," "Novosibirsk", "Krasnoyarsk," "Arkhangelsk" and "Perm" are built under the upgraded Yasen-M project. It is planned to build a total of seven submarines.


    More:
    http://tass.com/defense/935305


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    Re: Project 885: Yasen class

    Post  gaurav on Wed Mar 15, 2017 3:59 am

    So much secrecy surrounding yasen submarine.Evrything is ready and yet we do not have a single word of its missile systems.
    Let it start the actual trials.
    Yasen is coming very early for Russian navy compared to other russian naval projects

    Nakhimov project in 2020
    Peter the great modernization 2025
    Project 949AM in 2020 may be even 2025
    other Leader class destroyer again 2025..

    Stormm aircraft carrier 2030
    Keznetsov mordernization 2025 or even 2030.

    It is is only yasen-M that is coming online in 2019 -2020.May be in in 2020 we will have 2-3 yasen-M subs deployed.
    It is because of this early completion of yasen-m the secrecy surrounding yasen is very high.
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    Re: Project 885: Yasen class

    Post  George1 on Wed Mar 15, 2017 4:53 am

    gaurav wrote:So much secrecy surrounding yasen submarine.Evrything is ready and yet we do not have a single word of its missile systems.
    Let it start the actual trials.
    Yasen is coming very early for Russian navy compared to other russian naval projects

    Nakhimov project in 2020
    Peter the great modernization 2025
    Project 949AM in 2020 may be even 2025
    other Leader class destroyer again 2025..

    Stormm aircraft carrier 2030
    Keznetsov mordernization 2025 or even 2030.

    It is is only yasen-M that is coming online in 2019 -2020.May be in in 2020 we will have 2-3 yasen-M subs deployed.
    It is because of this early completion of yasen-m the secrecy surrounding yasen is very high.

    i doubt that i will be in forum until 2025.. unshaven


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    Re: Project 885: Yasen class

    Post  miketheterrible on Wed Mar 15, 2017 5:45 am

    Why? Are you expecting to kick it early?
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    Re: Project 885: Yasen class

    Post  gaurav on Wed Mar 15, 2017 9:51 pm

    George1 wrote:i doubt that i will be in forum until 2025..  
    You are one of the pillars of russiadefence if yu go we will left to dry .. with information black out.
    It is yur hardwork that keeps us abreast of latest developments in Russia.

    miketheterrible wrote: Are you expecting to kick it earl
    We can compare with other projects.For e.g Project 949A.We know that all submarines are already deployed.
    There is hardly any submarine left to go for repairs, re work, re-design.Some articles are calling for changing the launchers
    949A that does not seem feasible at all.
    It will take ages to do that. Compared to that yasen is ready to float with the equipment ready for testing.
    There is huge amount of difference between pr949A upgrade and yasen-M project as far as their timeline are concerned.
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    Re: Project 885: Yasen class

    Post  hoom on Thu Mar 16, 2017 4:02 am

    Yasen is coming very early for Russian navy compared to other russian naval projects
    This is sarcasm?
    Kazan was laid down in 2009 so hardly rapid.
    About same speed as Astutes so far.
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    Re: Project 885: Yasen class

    Post  PapaDragon on Thu Mar 16, 2017 6:22 pm

    hoom wrote:
    Yasen is coming very early for Russian navy compared to other russian naval projects
    This is sarcasm?
    Kazan was laid down in 2009 so hardly rapid.
    About same speed as Astutes so far.

    Kazan was still riding the 90's wave financial ''abundance'' and is heavily redesigned to boot so that ate into some time.

    Next one should give us pretty accurate build time.
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    Re: Project 885: Yasen class

    Post  Singular_Transform on Sat Mar 18, 2017 12:03 am

    PapaDragon wrote:
    hoom wrote:
    Yasen is coming very early for Russian navy compared to other russian naval projects
    This is sarcasm?
    Kazan was laid down in 2009 so hardly rapid.
    About same speed as Astutes so far.

    Kazan was still riding the 90's wave financial ''abundance'' and is heavily redesigned to boot so that ate into some time.

    Next one should give us pretty accurate build time.

    Kazan is the first RUSSIAN submarine.

    And the most complicated military system manufactured ever in RUSSIA.

    They had to create complete industries for it.

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    Re: Project 885: Yasen class

    Post  Austin on Sat Mar 18, 2017 9:51 am

    Longish Interview with general director of St. Petersburg Maritime Engineering Bureau "Malachite" Vladimir Dorofeev on Yasen Program

    http://tass.ru/opinions/interviews/4104781
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    Re: Project 885: Yasen class

    Post  George1 on Tue Mar 21, 2017 1:50 pm

    Russia's second upgraded Yasen-class project 885M submarine will be floated out on March 31, the Sevmash shipbuilder said Tuesday.

    MOSCOW (Sputnik) — Russia plans to have at least eight Yasen class cruise-missile carrying attack vessels in its submarine fleet.

    https://sputniknews.com/military/201703211051799128-russia-borei-submarine/


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