The reason for the early return by the Indian Navy of the leased nuclear submarine K-152 "Nerpa" of project 971 is named

The explosion on board and damage to the hull of the submarine was the reason for the premature return by the Indian Navy of the project 152 submarine K-971 "Nerpa" leased from Russia. This was reported by a source in the Russian defense industry.

According to the data, in the spring of last year, an explosion occurred on board the submarine, damaging both hulls of the submarine. According to the source, a high-pressure air cylinder exploded between the lightweight and durable housings. At this time, the submarine, which received the name S72 Chakra in the Indian Navy, was at sea.

As a result of the explosion, the hulls were seriously damaged. Electronic weapons and sonar equipment were also damaged.

- leads TASS source words.

The repair of the submarine's hull was carried out by Indian specialists, after which it was decided to send the submarine to Russia, especially since the lease expiration date is approaching. At the same time, according to Indian media reports, the submarine was returned due to problems with its maintenance, including the power plant. Among other things, this wording can also fit the damage received, after which the submarine lost part of its combat capabilities.

A submarine with an Indian crew in Singapore was met by a squadron of Pacific fleet as part of the "Admiral Tributs" BOD and the sea tug "Kalar", which will escort the "Nerpa" to Vladivostok.

Comments

[Lech from Android.]

If an air cylinder explodes, then it is either critically exceeded the air injection pressure, or a defect in the cylinder body, it is possible that the connection of the line from the cylinder has broken somewhere.
Let's see what the experts say.

[Victor_B]

What's the difference for what reason it exploded?
It shouldn't have exploded ...
Well, and for what (real or far-fetched) reason they did not extend the lease? .. Fuck them, Indians, he knows!
Maybe there was not enough room for dancing.

[knn54]

Dear forum users.
INTENSIVE use of the equipment in a warm sea, 100% humidity, ignoring the instructions / maintenance can lead to anything, in particular, corrosion of the same cylinder.

[NIKN]

Oh, for me this multi-armed god Shiva ... there are many hands, but all grow out of the ass.

[TermNachTer]

But now, at least it is clear why the boat was returned a year earlier, but they want another.

[Alex_1973]

Lech from Android. (Lech from Android)
If an air cylinder exploded, then either the pressure is critically exceeded

What do you want from the Indians? They know how to dance and sing well, but to handle technique, this is the problem. All the same, the Indians have never been real warriors in history, and apparently they will not be.

[Mountain shooter]

Quote: Alex_1973

All the same, the Indians have never been real warriors in history, and apparently they will not be.

You are unfair. India is big. There were both Rajputs (cavalrymen) and Sikhs. True, the majority of the population are not fighters at all, yes.

[Civil]

To repair - enter into the Pacific Fleet.

[Evil543]

Yes, and the submarine will now be like a car from a car-sharing, broken. Do not mind your own. These are gypsies.

[Kurare]

Quote: Evil543

Yes, and the submarine will now be like a car from a car-sharing, broken. Do not mind your own. These are gypsies.

A car from carsharing, if you stop it, you can stop and park it somewhere on the side of the road. With a submarine, such an attitude is fraught and fatal when you descend into the depths.

In all armies / navies, submariners are the elite. And then there's the Premier League. The best of the best were probably gathered there.

[Butchcassidy]

You will pay for the broken car, you will not go anywhere. It's the same story with a submarine

[Kurare]

Quote: ButchCassidy

You will pay for the broken car, you will not go anywhere. It's the same story with a submarine

Everything happens. Lohanulsya - pay. This applies to both the car and the rental submarine. True "clumsiness" with a sub could more likely cost the entire crew life.

[Wolf]

Sike is considered one of the best warriors.

[Paranoid50]

Quote: Wolf

Sike is considered one of the best warriors.

Not the case.

[Alexey Koshkarov]

And their Sith are like professional warriors.

[Dmitry Vladimirovich]

Quote: Lech from Android.

If an air cylinder explodes, then it is either critically exceeded the air injection pressure, or a defect in the cylinder body, it is possible that the connection of the line from the cylinder has broken somewhere.
Let's see what the experts say.

If the high-pressure cylinder (HP) had an initial defect, this would have manifested itself at the testing stage, not operation.
And then how much time has passed - dozens of dives.
Rather, overpressure, but the reason why this happened - the fault of automation or the human factor, will be sorted out.

[Alex777]

The topic of damage to the nuclear submarine's rugged hull by an exploded balloon raises questions. Is that possible?

[Dmitry Vladimirovich]

Quote: Alex777

The topic of damage to the nuclear submarine's rugged hull by an exploded balloon raises questions. Is that possible?

Since the boat did not sink, it means that a hole in the strong hull did not arise, rather it is a WB reservoir located between the strong and light hulls.
Damage - possibly a dent in a sturdy case, usually such damage will limit the operational depth of immersion.

[Alex777]

rather, it is a WB reservoir sandwiched between rugged and lightweight hulls.

In the article, as I understand it, this is what we are talking about.

Damage - possibly a dent in a sturdy case, usually such damage will limit the operational depth of immersion.

Yes, it is possible. I didn't think about that.

[EMMM]

Even a relatively small dent in a sturdy case significantly reduces its strength characteristics. Those. the safe limit (and, in principle, the working) immersion depth can decrease significantly. Repair: only cutting out the shell, and installing a new one - without this, no one will guarantee immersion qualities. Naturally, the Hindus cannot do this. Well, the replacement of the shell, as everyone understands, the replacement of cable, pipeline systems, weight recalculation, etc.

[Alex777]

It's like that. But already figured out that there was no explosion,
TASS denied this report.
Colleague bars876 clarified a little below.

Yes, none of them exploded, they blasted the boat very well with their nose during the exercises

I also heard about it out of my ears.

[Rzzz]

Quote: Alex777

The topic of damage by an exploded cylinder to a strong submarine hull raises questions

There the pressure is 400 atm. And if it exploded, it probably was even more, and much more.
With that kind of pressure, it's like a bomb.

[Alien From]

Most likely, the disgusting attitude to technology ....... not your own, do not mind .......

[bars876]

Yes, none of them exploded, they blasted the boat very well with their noses during exercises and our specialists have been doing repairs for all ten years ... I built this boat, and my acquaintances drive to service on business trips, from where I know ... to repair, here comes back to our factory ... They will repair and extend the lease ...

[Piramidon]

Quote: bars876

Renovate and extend the lease ...

The Hindus are asking for something else. Apparently they kicked that boat thoroughly.

[bars876]

If they want, they will buy it the same way they bought this one ... Rent, this is only one name, it is impossible to sell a military atom according to international laws, so they call it rent ... torpedo tubes bent or something with hydroacoustics ... In general, the sea there is warm, all the gates are rusted and the rubber is falling off ... the repair will be serious ...

[EMMM]

So, how were they fucked? Sound intact, or just the contours bent?

[barclay]

Quote: Lech from Android.

If an air cylinder exploded, then either the air injection pressure is critically exceeded, ...

And what, there is no protection from fools in the design of the cylinder (as a potentially dangerous unit)?

[Mityay65]

There are redundant safety valves of different designs that will work if the critical pressure is exceeded.
In addition, the compressor will physically not be able to create a line pressure higher than the calculated one. And this was done not by chance, but with intent.
The excess corrosion rate of the cylinder wall and fittings in "warm salt water" is from the realm of fantasy insights. The shipbuilders decided these questions in the 70s.
The explosion of the balloon, usually opening along the weld, is theoretically possible. A boat built for the saints of the 90s. The high-pressure cylinders were supplied from the component manufacturer, and there they could easily fake X-rays of the welded seam and the test pressure test report. This happens.
If so, then after a certain number of loading cycles, the safety margin for metal fatigue could be exhausted. In general, it is possible.
I am closer to the ideas expressed by bars876. They are more believable.

[ccsr]

Quote: Mityai65

The excess corrosion rate of the cylinder wall and fittings in "warm salt water" is from the realm of fantasy insights. The shipbuilders decided these questions in the 70s.

I am not very versed in marine technology, but land cylinders up to 200 atm had to be submitted for inspection and maintenance to specialized organizations in order to obtain permission to extend the operation for five years. So what struck me was that there was corrosion inside them, which was removed on a special machine, launching a long pin inside with chain links on it, which then knocked off the rust when rotating. Therefore, if the Indians did not look at the cylinders properly, and did not carry out maintenance, then it is possible that the corrosion was just a consequence of the explosion. However, experts can confirm or deny this - I do not presume to assert that it was due to corrosion that an explosion occurred.

[Mityay65]

For the operation of valves and high pressure vessels in the tropics:
1. At the design stage, the thickness of the vessel is laid from the condition of up to 2 mm per year and
2. Apply cathodic protection.
3. The fittings are made of alloy steel (stainless steel).
Periodic control of the thickness of the walls of the balloon is carried out using a thickness gauge. The latter is done according to our standards by a special organization with a license. The Indians also have these and are quite qualified.
What could have happened?
1. At the design stage, no increase in the vessel wall thickness was taken into account. Bo did not know that this was a boat for permanent operation in the tropics.
2. The cathodic protection could fall off, and because of the inaccessibility of the balloon's location, no one knew about it.
3. The fittings are ordinary, again none of the designers could have known that the boat would be permanently in the tropics.
Could formally approach the check of the residual thickness of the vessel walls due to the inaccessibility of the balloon.
This is, in addition to the above reason given by me, from a poor-quality weld.
However, as I wrote earlier, the opinion expressed by bars876 is more plausible in the context of information uncertainty.

[Disant]

A boat built for the saints of the 90s. The high-pressure cylinders were supplied from the component manufacturer, and there they could easily fake X-rays of the welded seam and the test pressure test report. This happens.

this is a serious roll!
your arguments
1. the saints of the nineties.
2. forged radiographs. This happens.
.
it turns out that now the cylinders will go to break one after the other. the whole fleet to the bottom.
and what is your "it happens" based on?

[Disant]

below in the comments MaxPV and KSVK gave exhaustive answers, who and what, and not fantasy Mitya65 about the tropics and the metal of the wrong system

[Aleks178]

The explosion of the balloon, usually opening along the weld, is theoretically possible.

No welds on the VVD cylinder

[lelik613]

There were too many fools.

[Vlad.by]

TASS has already filmed information about the explosion on board the boat. There was no explosion. Another reason for the termination of the lease, which is not specified. But we know that ...)))

[smart ass]

It was just a holiday, it was fun, the Indians were dancing at the post there was no one ...

[Bashkirkhan]

Every 10 years, you need to carry out medium repairs. In the absence of such repairs, the ship should be taken out of service.

[venik]

"...The repair of the submarine's hull was carried out by Indian specialists, after which it was decided to send the submarine to Russia, especially since the lease expiration date is approaching.... ... "
======
Well, that's all right. They gave them a toy for a while. They played around, broke, tried to fix it - it didn't work. So they returned it back, with the words: "On back! It's not interesting anymore ...". Well, just like the kids are crooked: "Third grade, second quarter!"

[ANB]

... broke, tried to fix it - it didn't work

Something there is no information at whose expense the repair will be.

[venik]

Quote: ANB

Something there is no information at whose expense the repair will be.

=======
Will there be? The boat is of course new (only 10 years), but the Indians seem to have completely abandoned it. Moreover, in warm For some reason, in the Indian Ocean, nuclear submarines wear out quickly ... In the 80s, the nuclear submarine 675MK also quickly exhausted the resource of the power plant after long trips to the Indian Ocean. I don’t know WHAT caused this?
So, there is a possibility that it can go for scrap ...

[ANB]

... So, there is a possibility that it can go for scrap ...

Has the rental price been repaid?

[ANB]

... I don’t know WHAT caused this?

Perhaps due to a decrease in efficiency. The refrigerator temperature is higher, the efficiency decreases. And the rubber is designed to operate in its own temperature regime. The temperature is not the same, the wear is higher.
This is just an assumption.

[EMMM]

I think that we will not find out about who will pay, as well as about who and why such
an experiment with rent was needed.

[Mini Mokik]

Judging by the way the Indians are always finishing Windu, it is strange that they still have not had a thread of a man-made disaster. Gypsies Sir.

[Jager]

Have you forgotten Bhopal yet?

[BARKAS]

This chakra has bad karma, so the Hindus have decided to return the boat back, all according to Hinduism, I suppose.

[Thrifty]

I would now sue them for a couple of tens of billions of dollars! Hands grow out of
perineum, herostrata underdeveloped. ...

[donavi49]

Then they will not take Bratsk.

The chakra is given back.
Bratsk will be rented in a couple of years, as the boat will be repaired.

[venik]

Quote: Cowbra

As in a joke. "I told you - the place is damned. And all of you - hands from the well., Yes, hands from the well."

=========
The already forgotten anecdote about AvtoVAZ - amused !!!
---------

Quote: Cowbra

Any balloon, even a household one, doesn't just explode.

=========
Here! Almost 10 years - it worked fine and then suddenly "bang"! Maybe it was necessary to follow the technique better? Check, repair in time?

[113262a]

The famous Indian - AND IT WILL BURN SO! (They don’t bury zhmurov today, according to the charter!)

[rotmistr60]

I'm wondering how the Indians would have gotten out of it if the accident hadn't happened by the end of the lease? Would the PL designers be blamed? Will there be a counter-investigation from the Russian side regarding the operating rules?

[BARKAS]

So the first accident was in the Russian fleet, the second already in the Indian one just at the beginning of the lease term.

[Disant]

So the first accident in the Russian fleet was

accident - in 2008, and the boat was accepted into the fleet in the last days of 2009

[Retvizan 8]

Damn it, they broke it and now it's not necessary to type!

[aszzz888]

According to the data, in the spring of last year, an explosion occurred on board the submarine, damaging both hulls of the submarine.

The boat is not an elephant.

[U-58]

On those Gods that we do not want ...
The grenade turned out to be the wrong system

[agond]

The interhull space in boats is very large and they rarely climb over it, unless at the plant during a major overhaul, that is, if you put some kind of tab there, you will not suddenly find, and after the incident, the light hull was probably opened, something was removed, repaired, real it will be very difficult to determine the cause of the explosion.

[Max PV]

An HP cylinder or vessel that has passed the GI and is in operation may "explode" due to:
1. Exceeding the design pressure (to avoid which it is necessary to periodically check the UCS according to the Rules and have a spare one, if the old one stops sitting, check the pressure gauges and do not operate the KU with inoperative automation, if it is provided).
2. Mechanical damage (GI, TO and metalloscopy will help)
3. Corrosion of the case (it is necessary not to turn off the cathodic protection stations, if any, paint the cylinder, carry out according to the Rules of GI and Maintenance and, if necessary, metalloscopy.
4. Destruction of pipelines and fittings (the same as in the previous paragraphs, but regarding pipelines).
If the cylinder exploded during operation (during filling, storage) and there was no direct mechanical impact that led to destruction (impact), any inspector will tell you that the person responsible for this vessel and, possibly, the service personnel who violated the Rules will be responsible. So definitely a jamb of Indians.

[Mityay65]

If a high pressure cylinder exploded, it could be due to metal fatigue due to reaching the critical pressure loading number. This usually happens due to poor-quality welding and forgery of inspection documents, which is not uncommon for the 90s.
The inspector will sort it out by examining the materials of the weld.

[Max PV]

I agree, there could be metal fatigue. But for this, a periodic technical examination with hydrotesting is carried out. I don't know how in the fleet, but in industry, for oxygen cylinders every 5 years, at least with a capacity check and hydraulics of 1,5Rnom, that is, if the cylinder is 150 atm, then the pressure is 225 atm. Yes, they could of course have made a linden, but this was their fifth point so substituted that God forbid, especially since the survey is not done by an inspector, who may not be able to do anything, but by a laboratory, manufacturer or operating organization (with oxygen, usually a SPS that has and a stand), for which it is easier to do everything according to the rules than then pay a fine or sit down.

[Aleks178]

Once again: there are no welds on the cylinder, it is solid-drawn, titanium. The case of an explosion of VVD cylinders (or cylinder) on the project boat 971 was in this century in the Northern Fleet. And also the nasal group. With the difference that the boat was moored. The reason is the diesel effect. This is when a compressor with a worn piston pump drives oil into the system, the oil separators do not cope or do not work. There is an ignition of oil vapors in the system, that is, the diesel effect.

[EMMM]

how nice to hear guys from submarine

[113262a]

The boat goes autonomous - TABOR goes to the sea! Remove the smell of sandalwood with bleach, and go into action!

[cniza]

The repair of the submarine's hull was carried out by Indian specialists, after which it was decided to send the submarine to Russia, especially since the lease expiration date is approaching. At the same time, according to Indian media reports, the submarine was returned due to problems with its maintenance, including the power plant.

Maybe later we will find out the real reason, but the Indians have always been club-handed ...

[APASUS]

In what condition is the boat interesting? Not because of the fact that they returned her, that they saved on everything

[Roman81]

Everything is there for rent equipment. Feel on pins and needles

[Abrosimov Sergey Olegovich]

Quote: cniza

Maybe later we will find out the real reason, but the Indians have always been club-handed ...

The Hindus may be crooked ... only if my memory serves me, we and this boat, too, are far from all, thank God: the story is very dark, during the tests at sea the emergency fire extinguishing system worked in some strange way. Either the control panel turned out to be faulty / not familiar to the crew, or the sailor "decided to have some fun" ... some toxic substance turned out to be in the fire extinguishing system ... as a result, people who were in the compartment died ...
This is with us.

Again, if my memory serves me right, the Indians have this boat "grabbed" the ground, the Indians have let on board specialists from the United States. There was a scandal - ours stated that the Americans could get / have access and could inspect / study the secret equipment ...

[Disant]

the emergency fire extinguishing system was activated

why are you casting a shadow over the fence - the boat was on trial. for this they are carried out.
and this has nothing to do with the most plausible version of Max PV, outlined above, in my opinion:

If the cylinder exploded during operation (during filling, storage) and there was no direct mechanical impact leading to destruction (impact), any inspector will tell you that the person responsible for this vessel will be responsible and also, perhaps service staffwho violated the Rules.

[LTCNL]

Rented, broken, returned. Directly car sharing in all its glory.

[val43]

Quote: venik

I don’t know WHAT caused this?

Is it possible that the first circuit is seawater?

[val43]

Quote: Thrifty

underdeveloped

Looking at what was written, you have a civilization too ... kind of softer ...
С

[Elena Akinfieva]

Technology in the hands of the Indians, tomahawk.

[KSVK]

Quote: Max PV

An HP cylinder or vessel that has passed the GI and is in operation may "explode" due to:

With GI, the cylinders are tested with one and a half pressure. Those. at working 400 kg / cm2, tests shall be carried out at 600 kg / cm2 I do not know how much the compressor can give the maximum pressure, but it seems to me that it is unlikely that 600 will pull. So even with a faulty valve, exceeding the maximum speed is unlikely. But corrosion is quite simple. And the internal one. It is corny not to change the dehumidifier in time. The only thing I faintly imagine is that the explosion of the balloon would lead to damage to the solid case. And even to the failure of internal devices. Either more than one balloon exploded there.

Quote: Max PV

So definitely a jamb of Indians.

With almost one hundred percent probability.

[Abrosimov Sergey Olegovich]

Quote: Disant

why are you casting a shadow over the fence - the boat was on trial. for this they are carried out.

Forgive me, you old fool, but those corpses were also provided as a test result ???

[Adimius38]

I knew when I wrote that the boat will most likely be brought in tow after the Indians ..... almost guessed right

[Comrade Kim]

Quote: Mityai65

falsify radiographs of the weld and test pressure test report. This happens.

Sometimes (in the dastardly 90s) and not like that. One bad friend told me how he used a sledgehammer to ring the bolts when assembling a small internal combustion engine.
Received bonuses for overfulfillment of the plan.

[portnoy]

This is the unfortunate "Nerpa" which stood on the stocks in Komsomolsk-on-Amur for more than 15 years, ready without a reactor, then the commissioning team died when it was handed over (suffocated), it was leased to the Indians and this is the result.

[Vladimir Koshevoi]

Exploded or helped? Here and rent to the end ...