Submarine Engineering

the diesel engine powers the a generator which powers electric motor which powers shaft nuclear powers turns turbine which powers genny, in reality nuclear subs do not need diesel engines except for back up power

I believe you've got it, Mr. or Mrs. or Ms. Tornado :-) And, I have at least heard that for most the seal is a ferrofluidic liquid seal ... but, being neither a submariner, nor submarine mechanic, I don't know for sure. Kind regards ...

Secret Cyborgs Created by Frankenstein Split their lips in a Patented manner and as they are having sex with perverted normal sailors scream and moan so as to reverse pressure flow.

It is all a secret zipper thing you are not authorized to be privy to.

submarine diesel engines operate up to snorting depth and engine exhaust,cooling system is designed to work up to the pressure developed by sea (Normally 10Mtr Depth ie 1Kg/sq cm or 1BAR approximately how ever with new-clear submarines this problem doesn't have any meaning

crm

ex submarine engineer Indian Navy

Were these Indian submarines, ex British submarines that had past their use-by-date???

I asked this question, because many ex naval personnel from Commonwealth countries, can testify to the heaps of shit the British would palm off to their allies.........from experience, I can truly say that I was glad we weren't their enemies. e.g. the aircraft carrier HMAS Sydney, was............wait for it...........the ex HMS Terrible...........what a bloody understatement was.

Not that I was.........or had any desire to be a submariner..........but, I believe snorting was particularly pleasant.........NOT...........in rough weather???

Did the sea water cooling system have a NRV fitted in the discharge O/B line?

Hello Guest

I always assumed the snorkel worked by using a float to keep the air intake and exhaust discharge above water. Obviously essential for the intake, and if it's there for the intake it seems logical to have it for the exhaust also. So exhaust would be at atmospheric pressure. Is this wrong?

For cooling, I assume there's a heat exchanger with sea water on the cold side (you wouldn't want to put sea water through your engine jacket!) This would see sea water pressure (at least up to snorkelling depth) but easy enough to desiogn for that.

On the original post - somebody mentioned shaft seal. I'd just add it doesn't have to give a perfect seal, a bit of leakage doesn't matter, it can run down to the lowest point of the sub and be pumped out.

Cheers......Codey

The boats only run the diesals when "surfaced". At other depths they run off of battery banks which are charged by the diesals.

German engineers invented the submarine snorkel. Late in World War II, one new type German submarine traveled over 2,000 miles and only something like 225 miles of that were on the surface. As others have pointed out, with nuclear power, new submarines can stay submerged indefinitely.

Is this a joke? I know that engineers have a weird sense of humor - or the lack thereof but this has to a troll.

You've got to be kidding me, right?

What kind of sub would have both a diesel engine and a nuke????? If you have a nuke, that's all you need to run the entire flaming boat!!!!

You will notice that I didn't use the word "SHIP" here.....know enough to know the difference!!!

Must be a Chinese "Junk"...... *LOL*

If you are talking about an air breather only, diesel/ electric. Supply air comes through the conning tower and when the boat dives the main induction valve closes. as for running while snorkeling. There is many a submariner will tell you about what happens when they encounter a large wave and the valve would slam shut causing a massive negative pressure in the sub. The propeller shaft is simple. Seals and lots of them.

LIGNUM VITAE!

(it is so fun to say, I am glad for any good reason to bring it up. It may not be the complete pressure seeal, but the 'tree of life' is functionally a large part of the shaft bearing.)

Benbenben

Correction..............used to be...........no longer used..........the tree huggers got onto it.

On the USS Daniel Boone SSBN-629 we had an Emergency Diesel a Fairbanks-Morse 6 Cylinder Model D 8 1/8 Opposed piston engine connected to a 300KW, 60 cycle AC generator. We also had a 150 horsepower emergency propulsion electric motor as part of the Main Shaft Line Components. We had a double shaft seal, each composed of a carbon seal ring (moving) mated to a stellite stationary seal ring. I made 11 patrols and 3 special ops on the Boone . . . total about 3 years underwater.

Design leak rate through the seals was less than 1 gpm.

I am sorry my friend..........nukes or conventional subs...........you can stick those "pig " boats right up where the monkey stuck his finger..............up his fundamental orifice.

I'm a destroyer man............"gimme the boats"............or minesweepers .............or patrol boats..........even bloody aircraft carriers...........but...........please anything, anything but those "sludgemarines".

US Patient number 3337222

Somewhat the arrangement of the shaft seal.