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pyle - the solenoid sticks open due to computer malfunction.explain to me how you even know its stuck open before its too late. On Thu, 5 Sep 1996, Richard Pyle wrote: > > > anthony,youre a smart man. > > Yes, he is. Very. > > > figure this out.solenoid failes on a closed > > circuit,pumps a bunch of pure o2 into the mix,what happens? > > The user shuts the solenoid supply cutoff valve. If that took some time, > the user switches to OC temporarily before the high PO2 makes its way > around the breathing loop. The user flushes the loop with diluent, goes > back to CC, and manually maintains O2 setpoint for the remainder of the dive. > > > at least in the > > semi closed youre breathing a known gas mix before hand. > > Stop! Stop! You're killing me! Wait - let me catch my breath. Sorry, but > the concepts of "breathing a known gas mix" and "semi closed rebreather" > in the same sentence struck me as extremely funny. > > > now,back to closed > > circuit,computer failes,whoops,we have no o2 readout. > > Any closed circuit rebreather that relies only on the computer to provide > a PO2 readout has some serious design flaws. Fortunately, I know of no > such closed circuit design that is or will soon be available commercially. > > Incidently, folks - my intention is not to be a "semi-closed basher". I > really do think they have a place in diving, and depending on the > particular unit, they can be damn useful in some situations. I'm just > trying to stamp out buffoonery here. > > Aloja, > Rich > > > > - jt > > > > On Wed, 4 Sep 1996, Anthony Montgomery wrote: > > > > > On Wed, 4 Sep 1996, John Todd wrote: > > > > > > > rich,no one who takes one of those 4 day iantd/tdi/whatever agency > > > > courses on "rebreather diving" will be trained right to deal with manually > > > > controlling the functions of the rebreather that are normally controlled by > > > > the computer.you of all people should realize that.on top of that,if the > > > > computer cant be trusted then how can you expect to trust the electronic > > > > output generated by the computer?at least with the mechanical rebreathers > > > > (err, semi-closed) theres no fancy gadgetry or tomfoolery to mess with,and > > > > as a result its safer. - jt > > > > > > > John, > > > > > > Do you really think semi-closed rebreathers are safer? It seems > > > to me that diving on a unit which depends on expected workload and > > > theoretical O2 consumption rate isn't safe. But actually I won't go as > > > far to say that semi-closed systems are unsafe. I would consider these > > > aspects of semi-closed systems a disadvantage just as I would consider > > > the likelyhood of electronic failure a disadvantage for fully-closed > > > systems. > > > > > > ANTHONY MONTGOMERY > > > Marine Option Program Waikiki Aquarium > > > 1000 Pope Road MSB #203 2777 Kalakaua Ave > > > Honolulu, Hawaii 96822 Honolulu, Hawaii 96815 > > > Fax: (808) 956-2417 Fax: (808) 923-1771 > > > Phone: (808) 956-6000 Phone: (808) 923-9741 > > > > > > > > > > > > > > > > > > > > > Richard Pyle > deepreef@bi*.bi*.ha*.or* > ******************************************************************* > "WHATEVER happens to you when you willingly go underwater is > COMPLETELY and ENTIRELY your own responsibility! If you cannot > accept this responsibility, stay out of the water!" > ******************************************************************* > >
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