Cold Tanks?

[TMHeimer]

Where the h*** you going to dive at -40?

During summer.

 

[j yaeger]

just out of the water
we got in at 4* f this morning
yesterday it was 12*
water is still 39* at depth,but have to break it at shore to get in!
air in tank didn't seem to mind the cold.....
baby your valves-nothing is quite as pliable in the cold!
...my buddy's neck seal didn't survive the doffing this am-but.....

he's moving to st. kitts for the next 3 years!!!not a problem!
have fun
yaeg

 

[RonFrank]

Ask yourself at what temp does alum and/or steel stop working! Your good, and I would think you could warm those tanks in an hour or less no problem. At 5 degrees an hour you be there all day, and run out of daylight. If your worried about the air ask yourself at what temp does air freeze solid! Colder than the temp reaches on this planet. Too hot, easily, to cold, not so much...

 

[iztok]

Well, we know that above a certain temp. in a closed car the burst disc will blow, so I guess the gas expands enough to do that. But can gas contracting at extreme cold temps. cause problems?

Do we know it? Calculations show that increase of pressure in a hot car is not big enough to cause pressure to burst the disk.

 

[TMHeimer]

Do we know it? Calculations show that increase of pressure in a hot car is not big enough to cause pressure to burst the disk.

Hmm.. I wonder what the temp. needs to be to blow a burst disk? Obviously if the tank's in a fire. I thought it was about 180 F.

 

[dumpsterDiver]

I think the pressure changes like 5 psi per degree F.... Did the calculation a long time ago.... Commercial aircraft experience some pretty dramatic temp changes during a typical flight. I wuldn't worry too much about harming a tank.

 

[iztok]

Hmm.. I wonder what the temp. needs to be to blow a burst disk? Obviously if the tank's in a fire. I thought it was about 180 F.

I did calculation here on sb a while ago and it was way above temperature of a hot car.

Sent from my MB860 using Tapatalk

 

[tbone1004]

depends on the fill pressure and the burst pressure of the disk...
As far as reheating it back up, I was just thinking don't leave it on top of the heater or in front of the radiator if you come back and are trying to get the temp in the house back up, and I wouldn't jump straight into the water.

Commercial aircraft are made out of aluminum not steel, and the pressure difference is nothing like what's going on in a tank. You get a max of like 12psi in the cabin, usually less at altitude which is absolutely nothing compared to scuba. The stresses that go through a scuba tank are immense compared to that, and considering the steel tanks are very thin, rapid heating combined with the increase in pressure is not necessarily an accident waiting to happen as far as a tank explosion, but I would be more worried about the neck o-ring failing or some valve part failing during the reheating and the brittle-to-ductile transition

 

[iztok]

Here is one of the calculations.

http://www.scubaboard.com/forums/5244637-post14.html

 

[Jax]

Now, wait a minute.

He's going to leave his tank up there, during some decent diving time. It'll sit the whole winter. By the time he gets back to it, it'll be decent weather.

No prob, right?