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<snip> >This seems to make perfect sense to me and I really can't fathom why >people would want to strap a useless unreachable air source to their >backs. Having never used a pony, I can't say I know for sure, but it seems to be either: "What if my buddy runs out of air" "What if my regulator stops working". The first is easily covered with rule #1 - the second is more emotive. AFAIK, the failure modes for a single-tank + regulator are: * running out of gas Check your gauges * blown tank o-ring very rare, but catastrophic * blown yoke o-ring use DIN * blown DIN o-ring total loss of gas, but slowly * 1st stage freeflow caused by poor maintenance/grit or v. cold water. * HP hose blown dramatic, but slow loss of gas prevented by gear maintenance and hose protectors * LP hose blown faster (but not instant) loss of gas gear maintenance + hose protectors * 2nd stage freeflow caused by poor maintenance/grit or v. cold water. Don't breathe from reg until under the (cold) water. I'm not a regulator tech/engineer, so I've probably missed some, and I don't have all the answers on prevention, so I'd be interested in seeing a more complete list. Anyhow, there do seem to be some failure modes that would require a bailout - at which point I'm left wondering what's wrong with the buddy. Ah, violation of rule #1 again. John Brett -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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