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Old 01 June 2011, 01:15 PM
overyonder overyonder is offline
Join Date: 03 March 2010
Location: Charlotte, NC
Posts: 2,092

Originally Posted by jimmy101_again View Post
This is a common problem in chem labs, exchanging air in a vessel with an inert atmosphere. The solutions is easy enough even without a vacuum pump. For a tire you fill and vent the tire a couple times. Figure the tire is at 15 PSI (absolute pressure) and you take it to the recommended 45 PSI (again absolute, not gauge, pressure). The tire now has about 6% oxygen in it. You vent and fill again with pure nitrogen and the oxygen content will be around 2%. The water content will be well below 1%. Repeat however many times you wish. Each fill / vent cycle will reduce the oxygen content by about 2/3rds of the previous cycle.
All nice and good. You reckon that shop guys do that? [Answer is: heck no!]

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