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  Reply # 1835440 2-Aug-2017 09:48
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Re non closed systems

 

How fast is the "higher" pressure oxygen coming out? 

 

Let's say you inhale a 1L breath. How fast does that 1L get inhaled? Probably 1s.

 

The oxygen equipment will need to be flowing at 60L per minute* for all that 1s, when you take a breath, if the mouth and nose is not sealed into a closed system.


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  Reply # 1835472 2-Aug-2017 10:09
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empacher48:
Aviation Security screening is mostly for show, there are still checks that the airlines will do in the background when you buy a ticket.

 



I flew to Australia yesterday and the security theatre was even more intrusive. You had to remove your phone and iPad from cases. My work iPad is in a keyboard case and that was treated as a laptop during descent.

Talking to my colleagues from other parts of Australia last night it was even worse domestically, checked luggage was searched and the delays were incredible.

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  Reply # 1835826 2-Aug-2017 15:47
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Batman:

 

Re non closed systems

 

How fast is the "higher" pressure oxygen coming out? 

 

Let's say you inhale a 1L breath. How fast does that 1L get inhaled? Probably 1s.

 

The oxygen equipment will need to be flowing at 60L per minute* for all that 1s, when you take a breath, if the mouth and nose is not sealed into a closed system.

 

 

depends on what its set at, between 1 and 4 LPM from what i can find. but remember at 100% 02 you are getting 500% your normal volume of 02 per breath.

 

but i suspect most are closed systems now so a moot point, it comes out based on demand.

 

the average human breaths 12-20 breaths per minute with a volume of about .5L

 

either way they are designed so the person wearing it wont inhale cabin air when set to the 100% mode. only when using the normal mode will the air in the mask be mixed with cabin air


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  Reply # 1835862 2-Aug-2017 16:24
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Jase2985:

 

depends on what its set at, between 1 and 4 LPM from what i can find. but remember at 100% 02 you are getting 500% your normal volume of 02 per breath.

 

 

Actually, you're getting the same volume, but all of it is O2. I think you meant that you're getting 500% your normal number of oxygen molecules of O2 per breath.

 

If you're breathing pure oxygen and you aren't in a pressurised environment and you're at 25,000ft, then you're only getting 500% * 0.3bar = 150% more oxygen molecules than normal.

 

 


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