<VV> Non-Corvair Specific: Gas freezing?

[Jim Davis]

Humm, dry air has the same expansion coefficient as dry gaseous 
nitrogen.  I suspect they use it because nitrogen won't oxidize the 
sealing layer inside the tires and it won't support a tire fire.  
Actually  nitrogen is a by product of  liquid oxygen production.   
Liquid nitrogen boils at -320 F  liquid oxygen at - 297.  Air with the 
carbon dioxide removed is dried, compressed and cooled to about -330 F 
(at one atmosphere pressure).  At this temperature, the nitrogen and 
oxygen will be liquids .  The mixture is allowed to boil and the vapor 
is pure N2.  What is left at - 315 F is pure, dry, oxygen liquid.

Back in the day most USAF bases had LOX plants to supply the air crews 
with oxygen.  A B-52 caries 99 liters of O2 in three converters.  Now 
days LOX is supplied commercially to the bases by the same vendor that 
supplies the local hospitals.
Jim Davis


On 12/25/2013 1:16 PM, Mark Durham wrote:
> Yes, and that is why aircraft tires are filled with nitrogen. They routinely fly at 35k to 41k altitude and we see -40 to -50 F there.
> Mark Durham, Hauser Idaho
> Sent from Huawei Mobile
>
> aeroned at aol.com wrote:
>
>> OK JR, at 50000 feet it's -69F not quite -97 or -80 but I suppose it's close enough?
>>
>>
>> -----Original Message-----
>> From: J. R. Read <hmlinc at sbcglobal.net>
>> To: virtualvairs <virtualvairs at corvair.org>; aeroned <aeroned at aol.com>
>> Sent: Tue, Dec 24, 2013 10:11 am
>> Subject: Re: <VV> Non-Corvair Specific: Gas freezing?
>>
>>
>> Probably more like 50,000 feet.  Still a problem.
>> Later, JR
>>