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I will answer only at the last part of your message. > Are cylinders that big ever worn twinned? 20Ltr + Cylinders are bad news , even big dives 100m+ can be done with a pair of 15-18ltr and stage tanks. Look at the Big DIR dives on Britanic do you see any tanks that extend below the divers buttocks ? If you need more gas you can use properly labeled stage tanks with bottom gas in them. Manos Manoli www.smiley.cy.net/cytech anthony.appleyard@um*.ac*.uk* wrote: >I came across a picture of a scuba set. Its cylinder could be >measured at 7.7 inches diameter, 28 inches long including the boot >but not the pillar valve. Its bottom end extended below the diver's >buttocks when he stood on land. If both ends of its inside are >hemispherical, if its walls are 0.35 inches thick, that works out at >0.556 cubic feet internal volume, which pressurized to 250 bars >makes 139 cubic feet = 5.15 cubic yards of air in it. >- Is that the correct way to work out the official listed capacity of a >cylinder? If now, what is the correct way? >- Are cylinders that big used much? What is its listed capacity? >- Are cylinders that big ever worn twinned? > >-- >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > > > > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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