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Order of possibility of failure- -Hose -First stage -Second stage Any of the above fails you shut of valve of offending reg. You still have access to all your air in both tanks. Independent doubles? Pony and in deco? you are screwed. Problem with valve? Shut off isolator. If you are following rule of thirds you will survive. No isolator on your manifold? you are screwed. A proper manifold made with Orings is probably the most reliable piece of gear you own. Extra failure point is BS. To short yourself by not getting an isolator would be a stroke move. A cage? Is this a troll? Ben, I don't know about you, but I don't go careening into walls and bulkheads, smashing my tanks into everything in sight. I realize that this is SOP for some divers, but, for some reason, those ranks seem to be thinning out. Jim On 1/26/98 2:34 PM Ben Greenhouse wrote: >Hey Folks: > > I was wondering what the current thought is on isolator valves. I >thought >that the general consensus was that they were just an extra failure point. > The >reasoning (as I remember it) was that the only time you would need an >isolator >valve is in the event of a neck o-ring failure on one of your valves. But >the >isolator valve in itself contributed more of a liability since it was more >likely to fail than a neck ring. Or in the event of a collision which might >rupture a neck ring, the isolator valve was likely to be damaged as well, >unless >you had a cage, in which case you wouldn't need the isolator anyways. So >what's >the thought now? > >Ben ------------------------------------------------------------------- Learn About Trimix At http://www.cisatlantic.com/trimix/trimix.html -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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