Date: Tue, 20 Oct 2015 23:11:02 -0400
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: Nytrogen and tires
In-Reply-To: <BLU169-W52F214ECF4A1413F106D52E0380@phx.gbl>
Content-Type: text/plain; charset="us-ascii"
Very few automotive or even body shops not have equipment to remove moisture
from their compressed air systems. Heck most don't even adequately deal with
the oil carry over from the pumps. There are various methods used to remove
moisture from compressed air with the most being refrigerated dryers or
desiccant systems. The effectiveness of air dryers system is measured using
the dew point.
Dennis
Compressors up to 350 HP and clean, oil free air systems drying to dew
points of -40f.
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
James
Sent: Tuesday, October 20, 2015 10:07 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Nytrogen and tires
Dry air is expensive to generate? Funny, it's 'generated' in pneumatic
equipment all over North America on a daily basis.
The pneumatic doors at your local food plant or airport aren't powered by
nitrogen gas - dry air is much cheaper! Another 'justification' for
charging you $10 for nitrogen that costs 5 cents - and replaces 2 cents
worth of air.
James (who teaches pneumatics as part of his course load) Ottawa, ON
> Date: Tue, 20 Oct 2015 11:16:53 -0600
> From: jondvo@GMAIL.COM
> Subject: Re: Nytrogen and tires
> To: vanagon@GERRY.VANAGON.COM
>
> The reason Nitrogen is used is because it eliminates water vapor
> issues with freezing. Nitrogen is free of water vapor and "dry" air is
> as expensive to generate.
>
> On 10/20/2015 9:55 AM, Angus Gordon wrote:
> >> PV = nRT ( T in Kelvin)
> >> It's all you need to know Angus. For tires, balloons, business
> >> meetings :)
> >>
> > I knew I'd been missing something. It's all about hot air, says
Alistair...
> >
> > Angus
> >
> >
> >>
> >>> On Oct 19, 2015, at 3:53 PM, Angus Gordon <birdworks@GMAIL.COM> wrote:
> >>>
> >>> Thanks David, I've been using a rule of thumb of 1% per 5F for a long
time but I don't know where it came from. Michelin perhaps. Normally I only
use it to overinflate when headed to a cold destination. Kept me out of the
weeds so far...
> >>>
> >>> Angus
> >>>
> >>>
> >>>> On Oct 19, 2015, at 3:46 PM, David Beierl <dbeierl@attglobal.net>
wrote:
> >>>>
> >>>> At 11:19 PM 10/17/2015, Angus Gordon wrote:
> >>>>> I have experience with nitrogen filled tires on aircraft and can
tell you that it certainly doesn't negate pressure changes with temperature.
That's still something we deal with. I don't see any real value in using
nitrogen in car tires.
> >>>> I believe pressure change as a percentage per degree will be
essentially the same no matter what gas or combination of gases is used to
fill a tire. It amounts to roughly one psi per ten degrees Fahrenheit for
tires at ordinary pressures and temperatures.
> >>>>
> >>>> Yrs,
> >>>> d
|