billt4sf
Contributor
How does the capacity of a 12Litre steel tank compare to that of an AL 80 or a steel 100? I read thru some articles but still could not determine it.
Thanks,
Bill
Thanks,
Bill
12Litre steel tank
- Thread starter billt4sf
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are you talking about a 12L 232? (3364Psi)?
12L steel 232 has 2784L gas. (12L *232Bar)
Al80 204 bar has 2264L gas (11.1L*204Bar)
Personally i dive D12 232 concave. I love the balance they give. Oddly enough, they have become my go to set, even if they are quite heavy.
12L steel 232 has 2784L gas. (12L *232Bar)
Al80 204 bar has 2264L gas (11.1L*204Bar)
Personally i dive D12 232 concave. I love the balance they give. Oddly enough, they have become my go to set, even if they are quite heavy.
beanojones
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Here's what is different about the same tank measured in metric units versus Cubic feet.
Metric measurements for tanks give you the number of liters of, say, water that it would take to fill the tank. A 12 liter tank would need 12 liters of water to fill the tank.
You then multiply the tank capacity times the fill pressure in Bars to get the actual liters of of contained in the pressurized tank.
American tank sizes just use the amount of air in the tank at the rated fill pressure and AL 80 holds 80 cubic feet of air when it is filled to its rated pressure. (actually 77.4 but)
It's probably easier at the start to just talk about tanks in all metric terms or in all American terms a 12 L tank can be a HP steel 100* in the US, and since that what everything around you in real life will be saying, it helps to call it that too.
**In other words that steel 100 contains 100 cubic feet of air when filled to its rated pressure.
(For once, Wikipedia is of no real use on this topic to an American because it has been written from international perspective)
(Also billt4sf, you should write a blog about your adventures into diving. One of the most interesting reads I have found linked on ScubaBoard is TSandM's blog posts she wrote when she was first diving, because she has left up what she was actually feeling and thinking way back when she was in the middle of her open water class. Even though she has gone way past that level now, its a good thing to see what an intelligent person who later learned much more was actually getting from the open water course as she took it.
It's clear you have passion and curiosity, and it is also clear that some of what we take for granted as common knowledge is anything but.
You can AFAIK, even do your blog right here on ScubaBoard.)
Metric measurements for tanks give you the number of liters of, say, water that it would take to fill the tank. A 12 liter tank would need 12 liters of water to fill the tank.
You then multiply the tank capacity times the fill pressure in Bars to get the actual liters of of contained in the pressurized tank.
American tank sizes just use the amount of air in the tank at the rated fill pressure and AL 80 holds 80 cubic feet of air when it is filled to its rated pressure. (actually 77.4 but)
It's probably easier at the start to just talk about tanks in all metric terms or in all American terms a 12 L tank can be a HP steel 100* in the US, and since that what everything around you in real life will be saying, it helps to call it that too.
**In other words that steel 100 contains 100 cubic feet of air when filled to its rated pressure.
(For once, Wikipedia is of no real use on this topic to an American because it has been written from international perspective)
(Also billt4sf, you should write a blog about your adventures into diving. One of the most interesting reads I have found linked on ScubaBoard is TSandM's blog posts she wrote when she was first diving, because she has left up what she was actually feeling and thinking way back when she was in the middle of her open water class. Even though she has gone way past that level now, its a good thing to see what an intelligent person who later learned much more was actually getting from the open water course as she took it.
It's clear you have passion and curiosity, and it is also clear that some of what we take for granted as common knowledge is anything but.
You can AFAIK, even do your blog right here on ScubaBoard.)
dfx
Contributor
80 cu ft = 2265 liters
pressure = 200 bar
2265 / 200 = 11.3 liters tank volume
simple enough.
pressure = 200 bar
2265 / 200 = 11.3 liters tank volume
simple enough.
elmer fudd
Contributor
It's in metric measure, therefore it's incomprehensible. Just like when a woman tells me she's 2.8 m tall and weighs 250 Kg 
.
.
dfx
Contributor
Only to the ignorant.
beanojones
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It's in metric measure, therefore it's incomprehensible. Just like when a woman tells me she's 2.8 m tall and weighs 250 Kg
Oh the irony, the irony, she is lost.
She is 39 stone 1 pound?
Mustard Dave
Contributor
It's in metric measure, therefore it's incomprehensible. Just like when a woman tells me she's 2.8 m tall and weighs 250 Kg
The metric system is much simpler. I know my steel cylinders have a volume of 12 litre each and my SPG is measured in bar. I can multiply the reading on my SPG by 12 at any point on the dive and easily work out how much gas is in my cylinder. I have an Ali 80 as a CCR bailout bottle; I refer to it as an Ali 80 as that is how they are commonly known, however, the fact it can hold 80 cu ft of gas means nothing to me once I have started breathing it. The only thing I want to know now is the volume of the tank and the pressure in bar.
It should be easy enough for most recreational divers to look at the tank and guess the rough volume in the units you normally refer to, and use a contents gauge whether in bar or psi. When you look at the contents gauge, try not to be at 40m/131 ft when the needle is in the red bit.
P.S. If a woman tells you she is 2.8m tall and 250 kg - run very fast!
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I do wish we would have gone to the metric system way back when I was a kid and everybody thought we were going to change over. For most things, it just makes so much more sense and its really very easy to learn. When I'm baking and cooking I can't even stand to do it in Imperial units anymore.
dfx
Contributor
And it doesn't look like it's going to change any time soon. There's a BS response from the government here: https://petitions.whitehouse.gov/pe...nited-states-instead-imperial-system/FndsKXLh
Canada has converted to metric a long time ago, but unfortunately the imperial units are still going strong in many areas, including all the diving related stuff. What makes it worse is that some units are the UK units, which are different from the US units. For example a Canadian/UK gallon is different from a US gallon.
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