Hi & What Tanks?

[Budg62]

Hi All

Just signed up today.

Qualified last year as PADI AOWD and off to Eygpt agin end of April.

Can anyone tell me what the difference is between 10l 12 & 15l tanks. You have the same bar approx 200 but do you actually get more air?

I never had this explained in all my training. Was just given a tank for each dive!

Budgie

 

[Amphibious]

um. ok, first, Welcome to Deeperblue!

Second, go slap your instructor. there is no way you should be even a basic diver and not have an understanding of tank volume.

the Litre rating is the Volume of each tank. Providing all 3 are @ 200bar 12lt tank will hold more air then 10 litre 15 more then 12, and so one.

 

[Old Man Dave]

In the good old days tanks were measured in cubic feet. Are they still in the States?

Anyway a 70 cubic foot tank contains 70 cubic feet of air at 1 atmosphere pressure. So if you let all of the air out in the carpark it would fill a bag 70 foot long by 1 foot square.

Nowadays tanks are measured in the volume they contain. If you took the top off a 15 litre tank you could pour 15 litres (3 gallons) of beer inside and it would be full to the top.

The trouble with this measuring in litres is; to find how much air a tank holds you got to times the volume by the pressure.

Soooo.... if all the tanks are the same pressure (say 232 bar) then the big tank is a 15L, middle size is a 12L and the titch is a 10L.

Starting with the 10L then a 12L is 20% bigger and holds 20% more air and lastly the 15L is 50% bigger than the 10L and holds half as much air again compared to the 10L.

My tanks are 232bar 12L and I think hold about 100/110 cubic feet of air. If you're clever with maths you can work it out. I am that clever but can't be bothered.

Here endeth the lesson

Dave

 

[SEDATE]

Welcome to Deeperblue Mate!