Re: Nitrogen in tires????


"Jeff" <kidsdoc2000@xxxxxxxxxxx> wrote in message
news:K%JRi.9328$GR1.3486@xxxxxxxxxxx

I fill my tires at a gas station that also uses air tools (air
wrenches, etc.). I think some of these systems have filters that let
the water condense. When air is compressed to 150 psi, the relative
humidity goes up by a facter of 11. The filters can remove most of
the water, effectively drying the air to a certain degree.

So, if you fill your tires at a gas station that uses an air filter
on its compressed air, you should end up with much less moisture in
your tires than one that has a compressor that doesn't have filtered
air (like the ones where there is a compressor that is turned on
when you put in the quarters).

A lot of old time gas station had water separators on their
compressors, but there are not many old time gas stations left. For
that matter there are not many gas stations that provide "free" air
these days. I know of two in my immediate area. Neither has a water
separator on the compressor. I have a couple of compressors on my
farm. None of my compressors have a water separator -although I do
occasionally bleed the tank (water accumulates in the tank). I am not
very good at this and as a result, I've lost a couple of tank because
of internal rust over the last 30 years. A little water vapor in the
compressed air doesn't have much of an effect on air tools (impact
guns, ratchets, air hammers) but it can ruin a paint job if you are
using a spray gun (guess how I know...). Still, for road use, the
amount of water vapor in the air used to fill tires is trivial and not
worth worrying about. If it bothers you, be sure to fill your tires
when it is really cold outside...

Ed


.

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