What's the fastest O2 Fill you've ever seen?

cool_hardware52 · 26th September 2007, 00:55

Quote: (Originally Posted by jeff h)

IMHO and expierence the smaller bottles aren't as bad becasue they don't get as hot as bigger bottles. Not that filling them fast is a good idea, it's not.

If you doubt this then try an experiment with air (or don't). Fill a 6 cuft bottle in say 1 minute, then fill an 80 cuft bottle in a minute. Scary thought isn't it.

I've seen 6 cuft bottles filled in seconds by mistake several times. They get warm but not that hot. If you filled an 80 cuft bottle in under a minute it would be HOT and I wouldn't want to be in the same room when it happened.

It's the rise time that worries me. Very hard to control the rate of fill in tiny bottles. I don't doubt that a fast fill in a bigger bottle results in a higher temp for the bottle. Bigger bottles have more gas in them, and therefore more heat was generated via compression. Bigger bottles also have much less lower surface area to volume ratio than a tiny bottle. What concerns me most is the peak temperature of the gas, and one would expect that to be higher in a small bottle filled in seconds vs a much larger bottle filled in ~6 to 8 times as long.

Tobin

Mdemon · 26th September 2007, 07:44

Filled a Buddy crack bottle recently? 0-Full faster than a Porsche...

Quote: (Originally Posted by cool_hardware52)

It's the rise time that worries me. Very hard to control the rate of fill in tiny bottles. I don't doubt that a fast fill in a bigger bottle results in a higher temp for the bottle. Bigger bottles have more gas in them, and therefore more heat was generated via compression. Bigger bottles also have much less lower surface area to volume ratio than a tiny bottle. What concerns me most is the peak temperature of the gas, and one would expect that to be higher in a small bottle filled in seconds vs a much larger bottle filled in ~6 to 8 times as long.

Tobin

View Poll Results: What's the fastest O2 fill rate you've ever seen?
60-100 psi/min (4-7 bars/min)	5	10.87%
100-200 psi/min (7-14 bars/min)	6	13.04%
200-500 psi/min (14-35 bars/min)	9	19.57%
500-2000 psi/min (35-138 bars/min)	10	21.74%
2000psi/min or greater (>138bars/min)	16	34.78%
Voters: 46. You may not vote on this poll

26th September 2007, 00:55	#11 (permalink)
cool_hardware52 RebreatherWorld Sponsor Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Mar 2005 Location: SoCal USA Posts: 385	Re: What's the fastest O2 Fill you've ever seen? Quote: (Originally Posted by jeff h) IMHO and expierence the smaller bottles aren't as bad becasue they don't get as hot as bigger bottles. Not that filling them fast is a good idea, it's not. If you doubt this then try an experiment with air (or don't). Fill a 6 cuft bottle in say 1 minute, then fill an 80 cuft bottle in a minute. Scary thought isn't it. I've seen 6 cuft bottles filled in seconds by mistake several times. They get warm but not that hot. If you filled an 80 cuft bottle in under a minute it would be HOT and I wouldn't want to be in the same room when it happened. It's the rise time that worries me. Very hard to control the rate of fill in tiny bottles. I don't doubt that a fast fill in a bigger bottle results in a higher temp for the bottle. Bigger bottles have more gas in them, and therefore more heat was generated via compression. Bigger bottles also have much less lower surface area to volume ratio than a tiny bottle. What concerns me most is the peak temperature of the gas, and one would expect that to be higher in a small bottle filled in seconds vs a much larger bottle filled in ~6 to 8 times as long. Tobin __________________ www.deepseasupply.com
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26th September 2007, 07:44	#12 (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: 1,926	Re: What's the fastest O2 Fill you've ever seen? Filled a Buddy crack bottle recently? 0-Full faster than a Porsche... Quote: (Originally Posted by cool_hardware52) It's the rise time that worries me. Very hard to control the rate of fill in tiny bottles. I don't doubt that a fast fill in a bigger bottle results in a higher temp for the bottle. Bigger bottles have more gas in them, and therefore more heat was generated via compression. Bigger bottles also have much less lower surface area to volume ratio than a tiny bottle. What concerns me most is the peak temperature of the gas, and one would expect that to be higher in a small bottle filled in seconds vs a much larger bottle filled in ~6 to 8 times as long. Tobin __________________ www.southwestmafia.com "small minds talk about people, Average Minds Talk About Events, GREAT MINDS TALK ABOUT IDEAS!" The WRONG Attitude will get you killed. "Once the agenda-monkeys and perfect-worlders have moved on, perhaps we can do some diving?"
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