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>>>>As for the advantages of a Draeger for deco, which you described below, I >>agree, but my one reservation is that, even though it is a good system, it >>is still more likely to fail than OC.<< How? It has one moving part. No, two: A first stage regulator and a second stage regulator. It actually is exactly as complex as a single hose regulator (with -one- hose) attached to a single tank. Open the valve, gas to a first stage, to a second stage regulator, with a purge valve. That's it. The demand diaphram is the auto add valve. The purge button is the manual add push-button which depresses the diaphram exactly like a second stage. >Just be sure & practice procedures for free-flow! The Draeger _is_ >wonderfully reliable, but it does have occasional failures (just like OC). >Whether the failures are more common than OC, I can't really answer, but >they take more skill to resolve. The most common I've seen are demand valve >failures - either too high a cracking pressure (as you noted - that's what >the bypass is for), or a free flow. Free flow seems to be less common, but >takes alot more skill to resolve. Err.... how hard is it to turn off a tank valve mounted at yer belly button and then crack it open when you need to refill the bag every 5 minutes or so? That's the -entire- emergency freeflow checklist for the thing. More skill to resolve than open circuit? Hmmm......... Not so sure. Still, hanging a hose from the boat seems best. Dave Sutton -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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