![]() ![]() When you have 4500 PSI filled in the tank you have 68 cu in of air. Thanks for the input, but I'm still confused on EXAMPLE A: You should double check my numbers since I have not. My original numbers were for a 80 cu-ft tank at 3,000 psi. This is a quick conversion from a spreadsheet I had put together the first time this was asked. You get the following sequence of values. V3=68+975 = volume of scuba and HPA joined together Now, if you use the HPA tank until the pressure drops to 1000 psi and then fill it from the same scuba tank the equation looks like this. P2=3272 <=new pressure in scuba tank and HPA tank. V2=volume of scuba tank and pressure tank linked together ![]() ![]() So, I'll add 50% and call it a 120 cuft tank. The actual volume of a 80 cu-ft scuba tank is roughly 650 cu-in. the both have the same amount of potential energy assuming both are actually 68cu-in tanks.ī> This has been discussed before. Thank you in advance to any positive input you may have in this.Ī> No. I am just looking for something higher than a guess in which I can formulate other tank sizes and into this equation. also with air bleed of fill station will reduce the accuracy as well. Of course we know that everytime you fill your pressure drops due to the volume of air excaping so lets say we don't want our 68ci tank to go below 1000 PSI and our SCUBA to go below 2000 PSI. How many fills can I expect from a 120 Cubic Foot 3500 PSI tank filling a 68cubic inch 4500 psi tank? buying the correct size tank in the first place.Ĥ500psi / 68ci = 66.17647 PSI per cubic inch?ĭoes a 68ci 3000 PSI tank have more shots than a 68ci 4500 psi tank if both are filled to only 3000 PSI? Filling smaller pb tanks from a SCUBA tankĢ. I'm no scientist or mathematics professor so please help me out here. ![]()
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