Not one for the sonar girls :p

DangerousDaze · 01-16-06, 05:56 PM

A question for the nukes out there. It's the job of the shaft seals to stop water entering the people tank where the shaft penetrates the hull. It does this by using pressurised water from the auxilliary seawater system to leak "outwards". My question is, what happens if the pump fails? Is there a chicken switch to seal the shaft more completely possibly at the loss of propulsion? Thanks for any help.

Great site, btw.

Nick

lesrae · 01-17-06, 01:07 AM

If I remember correctly there's an emergency/maintenance inflatable seal that can be used (I haven't seen it but imagine it's like a toroidal airbag) but the shaft can't/shouldn't turn while it's in use.

Kapitan · 01-17-06, 02:42 AM

they have that problem with the russian oscar class submarines if the shaft isnt turning then water comes in (what helped kill the Kursk crew).

so clamps and special air bags have been fitted to some submarines just not all of them.

DangerousDaze · 01-17-06, 04:47 AM

Thanks for the replies!

Nick

Konovalov · 01-17-06, 04:52 AM

Quote:

Originally Posted by Kapitain

if the shaft isnt turning then water comes in (what helped kill the Kursk crew).

Is this true of all modern submarines?

Kapitan · 01-17-06, 04:54 AM

not all i dont think as i believe only the oscar class have this issue its such a big issue with them that they have to clamp the submarines shaft before it reaches the pier hence why its toed in and out by two or three tugs.

lesrae · 01-17-06, 06:19 AM

Quote:

Originally Posted by Konovalov

Quote:

Originally Posted by Kapitain

if the shaft isnt turning then water comes in (what helped kill the Kursk crew).

Is this true of all modern submarines?

No, it's not. Sounds like a design or maintenance fault.

Kapitan · 01-17-06, 06:23 AM

its a problem with oscar and also the typhoons and delta's seems only to be with twin screwed subs western subs no clue

Bill Nichols · 01-17-06, 07:30 AM

Quote:

Originally Posted by lesrae

If I remember correctly there's an emergency/maintenance inflatable seal that can be used (I haven't seen it but imagine it's like a toroidal airbag) but the shaft can't/shouldn't turn while it's in use.

Righto! USS Tullibee had to use the emergency seal when their screw fell off in the Med.

June 16, 1978: "The propeller shaft of the TULLIBEE snaps just outside the hull causing limited engine room flooding and loss of propulsion while TULLIBEE is submerged in the Mediterranean. The flooding is stopped by tightening the emergency packing on the propeller shaft. The submarine quickly surfaces and is assisted by other US naval ships. The TULLIBEE is subsequently towed to Rota, Spain, for repairs."

http://navysite.de/ssn/ssn597.htm

Konovalov · 01-17-06, 07:39 AM

How does the propellor shaft snap? Is it metal fatigue or something else?

Kapitan · 01-17-06, 07:43 AM

never heard anything like that not a total loss of a propellor, heard about throwing a propellor blade HMS Onyx threw a blade during one op.

but a whole propellor what the heck?

Letum · 01-17-06, 08:01 AM

throwing a blade can snap the shaft - althow i doubt this is possible in a sub

joea · 01-17-06, 08:56 AM

Quote:

Originally Posted by Letum

throwing a blade can snap the shaft - althow i doubt this is possible in a sub

Arrgggh I clicked on your sig link ... braaainzzz.

Bill Nichols · 01-17-06, 09:05 AM

Quote:

Originally Posted by Konovalov

How does the propellor shaft snap? Is it metal fatigue or something else?

In Tullibee's case, it was a combination of corrosion and metal fatigue.

Abraham · 01-17-06, 09:11 AM

Quote:

Originally Posted by joea

Arrgggh I clicked on your sig link ... braaainzzz.

Graaaagh!

Me too...

Brainz, Brainz, Brainz
Where can I get a new set?

01-16-06, 05:56 PM	#1
DangerousDaze Watch Join Date: Jan 2006 Posts: 26 Downloads: 0 Uploads: 0	Not one for the sonar girls :p A question for the nukes out there. It's the job of the shaft seals to stop water entering the people tank where the shaft penetrates the hull. It does this by using pressurised water from the auxilliary seawater system to leak "outwards". My question is, what happens if the pump fails? Is there a chicken switch to seal the shaft more completely possibly at the loss of propulsion? Thanks for any help. Great site, btw. Nick __________________ SECURED - BLOWING SANITARY

01-17-06, 01:07 AM	#2
lesrae Grey Wolf Join Date: Feb 2004 Location: Somerset, UK. Posts: 932 Downloads: 31 Uploads: 0	If I remember correctly there's an emergency/maintenance inflatable seal that can be used (I haven't seen it but imagine it's like a toroidal airbag) but the shaft can't/shouldn't turn while it's in use. __________________ DOLPHIN 38

01-17-06, 02:42 AM	#3
Kapitan Sub Test Pilot Join Date: Mar 2005 Location: UK + Canada Posts: 7,130 Downloads: 77 Uploads: 7	they have that problem with the russian oscar class submarines if the shaft isnt turning then water comes in (what helped kill the Kursk crew). so clamps and special air bags have been fitted to some submarines just not all of them. __________________ DONT FORGET if you like a post to nominate it by using the blue diamond Find out about Museum Ships here: https://www.museumships.us/ Flickr for all my pictures: https://www.flickr.com/photos/131313936@N03/ Navy general board articles: https://www.navygeneralboard.com/author/aegis/

01-17-06, 04:47 AM	#4
DangerousDaze Watch Join Date: Jan 2006 Posts: 26 Downloads: 0 Uploads: 0	Thanks for the replies! Nick __________________ SECURED - BLOWING SANITARY

01-17-06, 04:54 AM	#6
Kapitan Sub Test Pilot Join Date: Mar 2005 Location: UK + Canada Posts: 7,130 Downloads: 77 Uploads: 7	not all i dont think as i believe only the oscar class have this issue its such a big issue with them that they have to clamp the submarines shaft before it reaches the pier hence why its toed in and out by two or three tugs. __________________ DONT FORGET if you like a post to nominate it by using the blue diamond Find out about Museum Ships here: https://www.museumships.us/ Flickr for all my pictures: https://www.flickr.com/photos/131313936@N03/ Navy general board articles: https://www.navygeneralboard.com/author/aegis/

01-17-06, 06:23 AM	#8
Kapitan Sub Test Pilot Join Date: Mar 2005 Location: UK + Canada Posts: 7,130 Downloads: 77 Uploads: 7	its a problem with oscar and also the typhoons and delta's seems only to be with twin screwed subs western subs no clue __________________ DONT FORGET if you like a post to nominate it by using the blue diamond Find out about Museum Ships here: https://www.museumships.us/ Flickr for all my pictures: https://www.flickr.com/photos/131313936@N03/ Navy general board articles: https://www.navygeneralboard.com/author/aegis/

01-17-06, 07:39 AM	#10
Konovalov Ocean Warrior Join Date: Sep 2002 Location: High Wycombe, Bucks, UK Posts: 2,811 Downloads: 9 Uploads: 0	How does the propellor shaft snap? Is it metal fatigue or something else? __________________ "In a Christian context, sexuality is traditionally seen as a consequence of the Fall, but for Muslims, it is an anticipation of paradise. So I can say, I think, that I was validly converted to Islam by a teenage French Jewish nudist." Sheikh Abdul-Hakim Murad (Timothy Winter)

01-17-06, 07:43 AM	#11
Kapitan Sub Test Pilot Join Date: Mar 2005 Location: UK + Canada Posts: 7,130 Downloads: 77 Uploads: 7	never heard anything like that not a total loss of a propellor, heard about throwing a propellor blade HMS Onyx threw a blade during one op. but a whole propellor what the heck? __________________ DONT FORGET if you like a post to nominate it by using the blue diamond Find out about Museum Ships here: https://www.museumships.us/ Flickr for all my pictures: https://www.flickr.com/photos/131313936@N03/ Navy general board articles: https://www.navygeneralboard.com/author/aegis/

01-17-06, 08:01 AM	#12
Letum Navy Seal Join Date: Feb 2005 Location: York - UK Posts: 6,079 Downloads: 43 Uploads: 0	throwing a blade can snap the shaft - althow i doubt this is possible in a sub __________________