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Bruce Since when did common sense become a failsafe in a difficult situation in 300fsw? - How much time would you waste if you just happened to turn it the wrong way - and what might be the effects on your already strained mental well-being when it doesn't turn off. How close are you now to being in a total clusterfuck? Fully on and you can turn it only one way - done in a few seconds thick mitts notwithstanding - if you can't do it practice! Wendell Grogan's e-mail says it all on this front. Then there is the little matter of the potentially fatal gas mixing error George was talking about. Regards Mark - another member of Europe's 25% club -----Original Message----- From: Bruce Stewart [mailto:bruces@sh*.ne*.au*] Sent: Sunday, April 15, 2001 06:18 To: RDecker388@ao*.co*; rikard.lundgren@sw*.se* Cc: techdiver@aquanaut.com Subject: Re: Isolating Manifold Question Bob, The Iso valve is there for what its describes "Isolation", theres no point in having it fully open as it acheives nothing. If you need to isolate a cylinder and are losing gas then the quicker the better. Remember when this happens every ounce counts. It can be confusing only because the loss of gas is still happening from the failed system half. The failed side should still be breathed till exhausted if one can. Then hop onto what should be 50% of what you had when the failure occured. The iso should be just cracked open to allow equalisation and shut with the minimum of effort, come on think about this and get your head out of the rubbish the agencies print. It is not common sense to have the iso valve fully open. Common sense is being familiar with the on/off directions of all valves and your buddies valves as well. Bruce At 07:55 PM 4/14/01 -0400, RDecker388@ao*.co* wrote: >In a message dated 4/14/01 9:55:22 AM Eastern Daylight Time, >rikard.lundgren@sw*.se* writes: > >> >As for the 3/4 of European divers using this method, divers taking there >> first steps into tech training , do so with IANTD or TDI, >> >, as shut downs are apart of syllabus, my instructor & people i have >> listened to use this method, and as far as i a aware As the said >> organisations are wide spread >around Europe , i can only conclude that >they >> are also shown this method. >> > > >I suspect this is more a matter of the individual instructor than what's >actually in the standards. I've read both of these agency's standards at one >time or another and do not recall a single line about requiring paritially >open ISOs. > >Common sense dictates that all valves need to be either all the way on or all >the way off. In a stressful situation requiring a valve shut-down it would >be way too easy to turn the valve the wrong way if it's only partly open. >With a strict on/off approach, the valve is only going to turn one way...... >THE RIGHT ONE! Bare handed, gloves or mitts, shutting down a valve is not a >difficult matter with a little practice. > >Bob D. >www.SportDiverHQ.com >-- >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'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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