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In a message dated 99-01-27 13:07:08 EST, you write: > > I am looking at buying a 7 foot hose as part of a gradual evolution > from a standard, PADI approved ( :-) ) recreational setup to a more > technical rig based in DIR standards. > > It was recommended by a tech diving friend (who does _not_ DIR, and is > quite happy to not do so) that the hose be 1/2 inch diameter, instead > of the standard 3/8. His complaint with 3/8 is that it is harder to > breath due to the extra turbulence that a long hose adds, and that a > 1/2 inch hose, with it's larger diameter would have less turbulence. > > This seems to make sense. > > Does anyone have any contrary thoughts, and has anyone tried both > and have a definitive answer? well, I know a few simple facts. At 120 psi you can push 121 cu ft/min of air through a nozzle. At 110 psi with a flow rate of 30 cu ft/min you lose a whopping 2 pounds of pressure at the end of a 50 foot 1/2 inch air line. I dont think I will worry about my long hose choking me any time soon. Rob Darrington. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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