We've done all our SM training out of Cozumel Marine World, and they are fantastic...All our CZM trips go through them. Great bunch of folks!!
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When I do the math, it seems that the capacities you are reporting for LP tank overfills are based on ideal gas behavior. Doesn't compressibility at those higher pressures make a difference that is big enough that you'd really want to account for it in your gas planning? I.e. an LP104 actually holds less than 145 and an LP121 really holds less than 165? In both cases, is it not enough less that you'd want to plan your gas based on the "real" capacity instead of the ideal capacity?