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Rick's message..

Tom wrote:

>When used like this, people enter the water with the cylinder off, and 
>turn it on when neccessary, usually the case when carrying O2 for deco..

>>>>
>>>>I have always been told that diving with the cylinder off could let water
into 
>>>the first stage, through the second stage since the hose would not be under
>>>pressure.
>>>Is this incorrect or is there a danger of this?


When I stated that the o2 was carried in with the cylinder off, I forgot to
state
That the cylinder and values had been pressurized then turned off, ie after the
initial equipment check, the system had NOT been purged.. It is also
worth checking the contents guage throught the dive to make sure that It is not
leaking.

Tom/
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   _/_/_/ _/_/_/ _/_/_/_/  	tow@uk*.ac*.nb*.ua*
    _/   _/  _/ _/ _/ _/      	PROUDMAN OCEANOGRAPHIC LABORATORY
   _/   _/  _/ _/    _/		BIDSTON,MERSEYSIDE	
  _/   _/_/_/ _/    _/ 		ENGLAND. L43 7RA

  I have to go down to the sea again, to the call of the running tide
  Tis a wild call but a clear call,  that cannot be denied.	
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