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I was on divernet and Bren invited me to share some information with you.
I dive in Canada and what I found when I came here was a bit disturbing.
>Tanks are called by the number of Cu feet.
>Some of the cubic feet measurements are actually untrue.
>Most people here refer to a 200bar tank as high pressure.
My two cents worth on this is that it is OK to call tanks by the maximum number of CU feet or liters that a tank can hold, BUT it is very useful to put in the volume measurement as well. A great deal of tanks don't have that.
The second and most disturbing issue is that some years ago the US dot decided to lower the working pressure of a number of old tanks. BUT the people including instructors and even manufacturers kept referring to them with the same figure that they had before. E.g. an old steel 72cu foot tank is actually 65cu foot, because it is a 10Liter at a maximum working pressure of 160 bars. I believe there are others like this.
The last point about calling a 200 bar tank, high pressure, my opinion is false because 200 is quite common and 232 is common all over Europe. I think 300bar tanks should be called high pressure.
My main reason about this is the danger of those that will come on this side of the pond and rent tanks. I'm set I got my tanks and I know the exact volume measurements and know how much to fill them, but others might walk right into the confusion.
Cheers
Lawrence
I was on divernet and Bren invited me to share some information with you.
I dive in Canada and what I found when I came here was a bit disturbing.
>Tanks are called by the number of Cu feet.
>Some of the cubic feet measurements are actually untrue.
>Most people here refer to a 200bar tank as high pressure.
My two cents worth on this is that it is OK to call tanks by the maximum number of CU feet or liters that a tank can hold, BUT it is very useful to put in the volume measurement as well. A great deal of tanks don't have that.
The second and most disturbing issue is that some years ago the US dot decided to lower the working pressure of a number of old tanks. BUT the people including instructors and even manufacturers kept referring to them with the same figure that they had before. E.g. an old steel 72cu foot tank is actually 65cu foot, because it is a 10Liter at a maximum working pressure of 160 bars. I believe there are others like this.
The last point about calling a 200 bar tank, high pressure, my opinion is false because 200 is quite common and 232 is common all over Europe. I think 300bar tanks should be called high pressure.
My main reason about this is the danger of those that will come on this side of the pond and rent tanks. I'm set I got my tanks and I know the exact volume measurements and know how much to fill them, but others might walk right into the confusion.
Cheers
Lawrence
