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------- Forwarded Message Follows ------- Date: Mon, 16 Sep 1996 04:31:08 -0700 From: gmiiii@in*.co* Subject: Re: aul & hp/lp tanks To: "JUHA FLINKMAN" <flinkman@fi*.fi*> Juha - you are so right about these issues - put them on the list. > OK George, I'll do just that. Here goes: >On the hp/lp thing: I've noticed the same thing between hp (here 300 bar >working pressure) and lp (200 bar) tanks as you mentioned in another >post. First, the hp systems, even when every component is compatible, >seem to be more prone to malfunctions. Also the changes in gas >compressibility as the pressure increases come into play. A 200 >bar tank contains 98% of the "theoretical" air volume (volume of tank >in litres at 1 ATM multiplied by pressure), whereas 300 bar tanks contain >only about 92 % of theoretical gas volume at 300 bar. As one dives these >hp rigs, it's easy to notice that pressure drops dramatically during >the opening stages of dive, and then levels off after the first 100 >bars is gone. Of course there are a lot of things that also affect to >this (tank cooling in the water, etc.), but we've run some >experiments and the gas compressibility really is the major issue >here: between 300 and 200 bars, there really is just 90% of the >theoretical air volume. > >Juha > George M. Irvine III DIR WKPP 1400 SE 11 ST Ft Lauderdale, FL 33316 954-493-6655 FAX 6698 Email gmiiii@in*.co* Good dives, Juha
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