# Oxygen Capacity

**URL:** <https://forum.cirruspilots.org/t/oxygen-capacity/41072>\
**Category:** Guest Discussion\
**Created:** [June 15, 2005, 10:26pm UTC](https://forum.cirruspilots.org/t/oxygen-capacity/41072 "2005-06-15T22:26:49Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![leesaage](https://sea1.discourse-cdn.com/copa/user_avatar/forum.cirruspilots.org/leesaage/32/18_2.png) [@leesaage](https://forum.cirruspilots.org/u/leesaage)\
**Post date:** [June 15, 2005, 10:26pm UTC](https://forum.cirruspilots.org/t/oxygen-capacity/41072/1 "2005-06-15T22:26:49Z")

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I’m renting an SR22 based at SNA and do not have convenient access to the actual AFM. The aircraft is equipped with the semi-portable oxygen tank fitted between the two rear seats. Can anyone tell me the capacity of the bottle? I’m planning a trip and need to do the calculations on duration.

Thanks,

Lee

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**Author:** ![raeiler](https://avatars.discourse-cdn.com/v4/letter/r/45deac/32.png) [@raeiler](https://forum.cirruspilots.org/u/raeiler)\
**Post date:** [June 15, 2005, 10:40pm UTC](https://forum.cirruspilots.org/t/oxygen-capacity/41072/2 "2005-06-15T22:40:44Z")

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> In reply to:
> 
> * * *
> 
> I’m renting an SR22 based at SNA and do not have convenient access to the actual AFM. The aircraft is equipped with the semi-portable oxygen tank fitted between the two rear seats. Can anyone tell me the capacity of the bottle? I’m planning a trip and need to do the calculations on duration.  
> Thanks,  
> Lee
> 
> * * *

Lee,

I believe the oxygen you are using in the rental aircraft is the semi-portable 22 cubic foot cylinder from Precise Flight and provides supplemental oxygen for one to four occupants.

Now based on what type of cannulas, masks, flow meters etc… you are using you can find a duration table here.  
[http://www.preciseflight.com/durationstable.html](http://www.preciseflight.com/durationstable.html)

You will need to check what portable oxygen system you are using in the aircraft you rent to get the correct chart as this one may not reference the model you are using.

Rick

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**Author:** ![leesaage](https://sea1.discourse-cdn.com/copa/user_avatar/forum.cirruspilots.org/leesaage/32/18_2.png) [@leesaage](https://forum.cirruspilots.org/u/leesaage)\
**Post date:** [June 15, 2005, 11:36pm UTC](https://forum.cirruspilots.org/t/oxygen-capacity/41072/3 "2005-06-15T23:36:11Z")

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Thanks, Rick. I had all the other data except the cylinder size. I have the correct flowmeters, oxygen conserving canulas and the consumption chart. Thanks again for providing the key missing piece.

Lee

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**Author:** ![rhelsing](https://avatars.discourse-cdn.com/v4/letter/r/ba8739/32.png) [@rhelsing](https://forum.cirruspilots.org/u/rhelsing)\
**Post date:** [June 17, 2005, 7:20am UTC](https://forum.cirruspilots.org/t/oxygen-capacity/41072/4 "2005-06-17T07:20:55Z")

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I have used mine with both constant flow and demand canulas and the times on the appropriate chart are pretty accurate.