O2 for suit inflation on deep Rebreather cave dives

Nemo1957 · 6th October 2006, 10:55

I really dont see the upside. With a proper undergarment in my suit for the water temp. A 8 cu.ft. drysuit inflation bottle with air in it will last me for 6 - 7 dives in the 160 - 220 ft. deep range, longer for more shallow dives. With a cylinder this small stowed properly you dont even know you have it on you.

One other downside to using your O2 would be the posibility of your drysuit valve stcking open for a time and your losing some of your O2 that you might need to surface. Your adding a failure point to your lifesupport.

Gibbon · 6th October 2006, 11:11

Quote: (Originally Posted by Nemo1957)

160 - 220 ft. deep range, longer for more shallow dives. With a cylinder this small stowed properly you dont even know you have it on you.

I think there may be an issue with units here, or perhaps Cedric and Mike should be sent on a PADI Dry Suit course so that they can both learn to control the amount to gas they waste?

Dutchy · 6th October 2006, 11:33

Quote: (Originally Posted by iain-hsm)

I would suggest a self donning dry suit so in the event of a fire…..open zip.

Oxygen fires are great to watch (provided than no people are involved)... Even steel beams will burn (you read right burn (not just melt) and the abundance of oxygen will consume material fast (especially fibers as used in undersuits as the fibers have a relatively large surface area) In this particular case the fire will extinguish in a matter of seconds being deprived of oxygen. My guess is that it will be gone after the initial WHOOOOSH All that you will need to open the zipper for is cooling the burns and solidifying the molten plastics that would otherwise continue to aggravate the burns for a while longer...

John Speers · 6th October 2006, 12:24

UK Steve tried O2 for suit inflation purposes once,,,

Marc T · 6th October 2006, 12:36

Quote: (Originally Posted by Drmike)

Why would you carry a NX40 on a deep cave dive when you cant breathe it??

It would be better staged

the idea is to have a secure gas for dry suit inflation but still usable to enrich your gaz mixture at depth ( emergency solution )

Mdemon · 6th October 2006, 12:46

Quote: (Originally Posted by Nemo1957)

One other downside to using your O2 would be the posibility of your drysuit valve stcking open for a time and your losing some of your O2 that you might need to surface. Your adding a failure point to your lifesupport.

Rather like a solenoid sticking open...

(BTW, my O2 drive tin is a 7li and I carry redundant O2.)

On the static question; in my drysuit is a big lump made up of 70% water which conveniently fits into every area. This extends beyond the DS into the surrounding water. My feeling is that this will go some way towards earthing any static before it builds up to sparking levels.

***EBT*** · 6th October 2006, 12:51

Quote: (Originally Posted by Gibbon)

I think there may be an issue with units here, or perhaps Cedric and Mike should be sent on a PADI Dry Suit course so that they can both learn to control the amount to gas they waste?

I suspect the issue is more related to the design ethos of the boris. It's built around the assumption that inflation is offboard, so onboards are only 2L's and not really of much use for anything other than rebreathing.

This leads to most users doing their primary bouyancy control off a stage and into thier drysuit.

/Z

UKSteve · 6th October 2006, 13:59

Quote: (Originally Posted by John Speers)

UK Steve tried O2 for suit inflation purposes once,,,

Oi ...you flipping grass... I owned up to that one a couple of pages earlier!! I knew you would show up eventually!!

Steve

SimonK · 6th October 2006, 14:45

The part that would worry me is getting out of the suit at the end of the dive when the undersuit is saturated with O2. Just takes someone with a cigarette in hand coming over to 'help'.

I did hear of someone who had spent a day teaching the correct handling of liquid oxygen. When he had finished and put everything away he relaxed somehow ignited his oxygen soaked overalls.

Simon

Mdemon · 6th October 2006, 15:21

Quote: (Originally Posted by SimonK)

The part that would worry me is getting out of the suit at the end of the dive when the undersuit is saturated with O2. Just takes someone with a cigarette in hand coming over to 'help'.

I did hear of someone who had spent a day teaching the correct handling of liquid oxygen. When he had finished and put everything away he relaxed somehow ignited his oxygen soaked overalls.

Simon

Erm... The volume in the suit is going to be very small. And O2 isn't flammable! So, in the cigarette example even if you opened the suit and waved the cigarette around, all that will happen is that the cigarette will burn faster. We're not talking about filling the DS with Camping Gaz...

6th October 2006, 10:55	#21 (permalink)
Nemo1957 New Member Current Rebreather/s: Optima Other Rebreather/s: Join Date: Apr 2006 Location: New York Posts: 78	Re: O2 for suit inflation on deep Rebreather cave dives I really dont see the upside. With a proper undergarment in my suit for the water temp. A 8 cu.ft. drysuit inflation bottle with air in it will last me for 6 - 7 dives in the 160 - 220 ft. deep range, longer for more shallow dives. With a cylinder this small stowed properly you dont even know you have it on you. One other downside to using your O2 would be the posibility of your drysuit valve stcking open for a time and your losing some of your O2 that you might need to surface. Your adding a failure point to your lifesupport.
(Online)

6th October 2006, 11:11	#22 (permalink)
Gibbon Southern Monkey Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Aug 2005 Location: East Devon Posts: 226	Re: O2 for suit inflation on deep Rebreather cave dives Quote: (Originally Posted by Nemo1957) 160 - 220 ft. deep range, longer for more shallow dives. With a cylinder this small stowed properly you dont even know you have it on you. I think there may be an issue with units here, or perhaps Cedric and Mike should be sent on a PADI Dry Suit course so that they can both learn to control the amount to gas they waste?
(Offline)

6th October 2006, 11:33	#23 (permalink)
Dutchy SK#007 Current Rebreather/s: Sport Kiss Other Rebreather/s: Join Date: Apr 2006 Location: Nieuwegein (The Netherlands) Posts: 729	Re: O2 for suit inflation on deep Rebreather cave dives Quote: (Originally Posted by iain-hsm) I would suggest a self donning dry suit so in the event of a fire…..open zip. Oxygen fires are great to watch (provided than no people are involved)... Even steel beams will burn (you read right burn (not just melt) and the abundance of oxygen will consume material fast (especially fibers as used in undersuits as the fibers have a relatively large surface area) In this particular case the fire will extinguish in a matter of seconds being deprived of oxygen. My guess is that it will be gone after the initial WHOOOOSH All that you will need to open the zipper for is cooling the burns and solidifying the molten plastics that would otherwise continue to aggravate the burns for a while longer... __________________ = This post is environmentally friendly. It is composed of 100% recycled electrons only. = SK #007
(Online)

6th October 2006, 12:24	#24 (permalink)
John Speers New Member Current Rebreather/s: Evolution Other Rebreather/s: Join Date: Aug 2005 Location: Kent Posts: 19	Re: O2 for suit inflation on deep Rebreather cave dives UK Steve tried O2 for suit inflation purposes once,,,
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6th October 2006, 12:36	#25 (permalink)
Marc T hell is in the details Current Rebreather/s: RB80 / Clone Home Build Other Rebreather/s: Not Bought Yet RB80 / Clone Home Build Join Date: Sep 2005 Location: FRANCE Carcassonne Posts: 470	Re: Surprise, surprise... Guess who! Quote: (Originally Posted by Drmike) Why would you carry a NX40 on a deep cave dive when you cant breathe it?? It would be better staged the idea is to have a secure gas for dry suit inflation but still usable to enrich your gaz mixture at depth ( emergency solution )
(Online)

6th October 2006, 12:46	#26 (permalink)
Mdemon SiegeEngine II Current Rebreather/s: Inspiration Classic Home Build Other Rebreather/s: Inspiration Classic Home Build Join Date: Feb 2007 Location: SWUK Posts: 1,904	Re: O2 for suit inflation on deep Rebreather cave dives Quote: (Originally Posted by Nemo1957) One other downside to using your O2 would be the posibility of your drysuit valve stcking open for a time and your losing some of your O2 that you might need to surface. Your adding a failure point to your lifesupport. Rather like a solenoid sticking open... (BTW, my O2 drive tin is a 7li and I carry redundant O2.) On the static question; in my drysuit is a big lump made up of 70% water which conveniently fits into every area. This extends beyond the DS into the surrounding water. My feeling is that this will go some way towards earthing any static before it builds up to sparking levels. __________________ www.southwestmafia.com "Once the agenda-monkeys and perfect-worlders have moved on, perhaps we can do some diving?"
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6th October 2006, 12:51	#27 (permalink)
*EBT* Apprentice Luddite Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Feb 2005 Location: UK, Brighton Posts: 1,930	Re: O2 for suit inflation on deep Rebreather cave dives Quote: (Originally Posted by Gibbon) I think there may be an issue with units here, or perhaps Cedric and Mike should be sent on a PADI Dry Suit course so that they can both learn to control the amount to gas they waste? I suspect the issue is more related to the design ethos of the boris. It's built around the assumption that inflation is offboard, so onboards are only 2L's and not really of much use for anything other than rebreathing. This leads to most users doing their primary bouyancy control off a stage and into thier drysuit. /Z __________________ Eagles May Soar, but weasels don't get sucked into jet engines! Rebreather World Terms of service Real diving t-shirts for real divers
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6th October 2006, 13:59	#28 (permalink)
UKSteve Still a novice... Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Jul 2005 Location: Weymouth, UK Posts: 577	Re: O2 for suit inflation on deep Rebreather cave dives Quote: (Originally Posted by John Speers) UK Steve tried O2 for suit inflation purposes once,,, Oi ...you flipping grass... I owned up to that one a couple of pages earlier!! I knew you would show up eventually!! Steve
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6th October 2006, 14:45	#29 (permalink)
SimonK Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Oct 2005 Location: Cumbria UK Posts: 231	Re: O2 for suit inflation on deep Rebreather cave dives The part that would worry me is getting out of the suit at the end of the dive when the undersuit is saturated with O2. Just takes someone with a cigarette in hand coming over to 'help'. I did hear of someone who had spent a day teaching the correct handling of liquid oxygen. When he had finished and put everything away he relaxed somehow ignited his oxygen soaked overalls. Simon
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6th October 2006, 15:21	#30 (permalink)
Mdemon SiegeEngine II Current Rebreather/s: Inspiration Classic Home Build Other Rebreather/s: Inspiration Classic Home Build Join Date: Feb 2007 Location: SWUK Posts: 1,904	Re: O2 for suit inflation on deep Rebreather cave dives Quote: (Originally Posted by SimonK) The part that would worry me is getting out of the suit at the end of the dive when the undersuit is saturated with O2. Just takes someone with a cigarette in hand coming over to 'help'. I did hear of someone who had spent a day teaching the correct handling of liquid oxygen. When he had finished and put everything away he relaxed somehow ignited his oxygen soaked overalls. Simon Erm... The volume in the suit is going to be very small. And O2 isn't flammable! So, in the cigarette example even if you opened the suit and waved the cigarette around, all that will happen is that the cigarette will burn faster. We're not talking about filling the DS with Camping Gaz... __________________ www.southwestmafia.com "Once the agenda-monkeys and perfect-worlders have moved on, perhaps we can do some diving?"
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