in relation to charles's law. why is it important to refill air tanks when they are submerged?
2007-01-24 09:23:42 · 5 answers · asked by rvanessa74 1 in Environment
To cool them while they are filled. Compressing air makes it very hot. If you didn't do this the amount of air they hold would be significantly less when they cooled since they are filled to a certain pressure regardless of the temperature during filling.
2007-01-24 10:06:29 · answer #1 · answered by Flyboy 6 · 0⤊ 0⤋
You DO NOT have to fill tanks while they are submerged in water. Yes, they get hot when filled (the more rapidly the hotter). However putting them in a tank of water is bad. Her's why....
The neck of the scuba tank and the area just below it (the curve towards the neck) is the weakest part of the tank. When tanks are placed in water, this portion of the tank is usually out of the water, while the rest of the tank is submerged. So the temperature variant is the greatest at the weakest part of the tank! Not good for the tank.
Also, have you ever looked at the water tanks that the fills are done in? The water is usually nasty and hasn't been changed that recently. Just think if one or two drops of this water was on the tank valve or fill whip when the tank gets filled. That water gets atomized and put into the tank. Then you get to breathe whatever bacteria was growing with every breath. Yuck!
The best way to fill a tank is slowly, even more so for steel tanks which get really hot, especialy the high pressure ones. A good shop will overfill the tank just a bit, so that when it cools you have a full tank of air (3000-3200 psi) for a standard tank.
2007-01-24 10:41:25 · answer #2 · answered by scubamike_1468 2 · 0⤊ 0⤋
I know some of you are SCUBA professionals, but most of the high pressure compressors have a small bin now that circulates cool water around the base (not the neck) of the tank. This allows the tanks to cool so that they may be filled faster. Yes, they can be filled to max pressure slowly, but it takes hours to let the tank cool. This is especially true for high pressure tanks. My HP's are fast filled to 3800 even in cool water and it cools to about 3500.
As far as water getting into the tank...if you get water into your tank, you have many other problems to look forward to besides bacteria. Water will destroy a steel tank.
The valve should never be underwater unless the compressor valve is tightly connected. If done correctly, then no water will enter the tank. This makes sense because, after all, when we dive, the tanks are underwater!
2007-01-25 03:32:19 · answer #3 · answered by sweetsouth 3 · 0⤊ 0⤋
Doug has it in simple terms approximately splendid! that's to ward off the rigidity from lost simply by after-fill cooling (or a minimum of a smaller rigidity drop). although, the main well known scientists in this field (NOAA) advise which you do no longer use water jacket filling simply by fact the time-saving that it facilitates is a lot outweighed by using the possibility of water getting into your tank. this might reason corrosion interior and in all risk a hypoxic fill (too little O2).
2016-12-12 19:32:23 · answer #4 · answered by Anonymous · 0⤊ 0⤋
If it explodes the water will absorber most of the energy.
2007-01-24 10:54:25 · answer #5 · answered by JOHNNIE B 7 · 0⤊ 0⤋