On the west coast we have 1/2, 3/4. and day boats where you bring your own tank. And you get hot fills. But boats pump to 3000psi without a problem and they cool to around 2700 to 2800. still 15% over fill! If you own your own compressor you would know how hard it is on them. That is why it takes so long for that last 500psi! You must be getting a slow fill or it is in a cold climate! Live aboards usually have 80qft @ 3000 and they consider a good fill to be 2800psi!
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So psi's is the force behind the air, cubic feet is the amount of air available to breathe.
I would rather have 100 cubic feet available at 2500 psi's than 80 cubic feet available at 3500 psi's, all other things being equal.
In cave diving you use 105qft or 120qft steel LP tanks filled to 3800plus psi! with 105qft tanks that gives you about 290qft of air for your dive! The steel allows you to take off hip wight and in fresh water with doubles you don't use a wight belt! So yes all things equal LP is the way to go and even if both tanks were 80qft one HP and one LP at 3000psi one is 20% over and one is 15% under! One is a 95qft tank at the start and the HP is a 72qft tank at the start. You can see that in wreck and cave, buddies have to work out tank dissimilarities because you have to have enough air to get the biggest air hog and yourself out just in case it hit the fan!
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It all goes to show you that size counts, but it is also in how you use it!
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And you would have a much larger and heavier tank in that scenario.Originally Posted by iDiveChick
Or filled in a water tank. I don't have my own compressor but none of the local dive shops seem to have a problem filling my tanks. Getting back to the LP95/HP119, how can the LP95 be preferable to the HP119 when they're bascially the same tank with a different burst disk? The 119 has 95 cu. ft. of gas at 2640, 107 cu. ft. at 3000 and 119 cu. ft at 3442 psi.
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