This is a sample of the downloadable helium chart but as it's 5 pages long I have just shown you the first few lines!Īs most of us use 11" balloons more than other sizes, I will use 11" balloons for my example. There is a great downloadable helium chart just click hereand keep it in an easy to find place on your computer so that you can calculate your helium costs easily. Qualatex give us all the information that we need to do this, they have produced 2 charts one for Latex and Chloroprene balloons and the other for Microfoil® balloons. So how can we use this information to tell us how many balloons we can inflate from this cylinder. Now, what if we have used some of the helium already and the bar reading says that we have only 50 bar pressure, the sum would look like this:Ĥ5 (capacity in litres) x 50 (bar pressure) = 2,250 ÷ 1000 = 2.25m 3 helium remaining in the cylinder. So lets say that we have a unused 45 litre cylinder (Size L ) that reads 200 bar (full)Ĥ5 (capacity in litres) x 200 (bar pressure) = 9,000 ÷ 1000 = 9m 3 helium in the cylinder - which we already know. Multiply the capacity in litres by the cylinder pressure (this is the bar pressure as indicated on your regulator) and then divide by 1000 to obtain the volume in cubic metres. To find this out we take the volume which for the L Size Cylinder is 9 m3 x 1000 = 9000 now divide it by the bar pressure reading which is 200, which give us 45 litre.
Firstly, we need to know the capacity of our cylinder in litres, which is something that is not shown on the above chart.
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