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Kurosawa
Posted on Tuesday, May 16, 2006 - 04:43 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

http://www.innovativebalancing.com/Nitrogen.htm
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Brineusaf
Posted on Tuesday, May 16, 2006 - 04:50 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

So you are always going to have "some" are present, and adding air to the nitrogen is fine? Hmm... I like are, more common, and most of the time it is free. I embrace the free things in life.

"Can't get much for a buck these days!"....1010 commercial.
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Kurosawa
Posted on Tuesday, May 16, 2006 - 04:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Air is in my budget too, but I'm convinced some Bueller somewhere with deeper than deep pockets will add one of those Ingersoll-Rand nitrogen generators to his garage junk.
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Eric_m
Posted on Tuesday, May 16, 2006 - 05:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Nitrogen Generator?
It would be easier to just have a tank and regulator. Thats what we use on the race cars at work.
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Brineusaf
Posted on Tuesday, May 16, 2006 - 05:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Don't they sell disposable compressed nitrogen cans, similiar to compressed air in a can for airbrushing?

Still to expensive for me, I love the gas stations with free air.
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Slaughter
Posted on Tuesday, May 16, 2006 - 05:30 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I use a 79% Nitrogen mix in my racebike. Once I got pressures sorted out for that, I use the same gas mix in my streetbikes too : D

I understand that jazz woodwind and brass instrumentalists also use a 79%mix to good advantage - not certain but I think it would work for classically trained musicians as well.
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Whodom
Posted on Tuesday, May 16, 2006 - 05:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

A couple of friends of mine have bought auto tires at Costco lately and they say they fill all their tires with nitrogen. They install flourescent green valve caps to designate this.

Seems pretty gimicky to me for the average Joe that buys tires there.
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Natexlh1000
Posted on Tuesday, May 16, 2006 - 05:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I hear that Brad Pitt sleeps with his bedroom set to 79% Nitrogen.
Most successful people these days breathe a simmilar ratio.
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Teddagreek
Posted on Tuesday, May 16, 2006 - 06:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Costco will do your bike...
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Dongalonga
Posted on Tuesday, May 16, 2006 - 06:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

will costco do brads ride as well or would they be to starstruck and forget to use the nitro??
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Diablobrian
Posted on Tuesday, May 16, 2006 - 07:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

A good air compressor with a dryer on the outlet will work just fine for anything you choose to do.

Be careful though that 20.8% oxygen can contribute to fires!
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Mdm
Posted on Tuesday, May 16, 2006 - 07:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I use a 78% nitrogen / 21% oxygen mix exclusively in *all* my vehicles. Heak, I even breathe it
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Kdan
Posted on Tuesday, May 16, 2006 - 07:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I try to maintain a 79% nitrogen blend, but it seems to keep turning into methane and CO2. What am I doing wrong?
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Indy_bueller
Posted on Tuesday, May 16, 2006 - 07:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

They say the military uses nitrogen in their tires? I was in the Army for 8 years and I never saw anyone use nothing but air to fill tires.
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Kurosawa
Posted on Tuesday, May 16, 2006 - 07:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Dryer on the outlet?
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Tiburondriver47
Posted on Tuesday, May 16, 2006 - 08:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Kdan.I think its because its coming out of both ends.

(Message edited by tiburondriver47 on May 16, 2006)
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Diablobrian
Posted on Tuesday, May 16, 2006 - 08:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

yes there is a difference between "wet" and "dry" air.
You'd be amazed how much moisture is in the air if
you've never drained an air compressor after a few
hours work with air tools, or painting. If you don't
use a dryer quite a bit of that water will come out
of the hose with the air.
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Samiam
Posted on Tuesday, May 16, 2006 - 08:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The only benefit I have seen in using nitrogen in tires is in aviation. I am in the Navy and all we use to fill our tires on our planes is nitrogen. I think the reason being is nitrogen is nonvolatile and *what if* a tire were to blow? Wouldn't want compressed oxygen in there for that. I could be wrong....

Sam
2 weeks till I come home!
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Paulson
Posted on Tuesday, May 16, 2006 - 08:49 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Dunn tire here in CNY uses nitrogen for their tires too. Gimmicky? Maybe. Seemed to be OK for my truck.
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Eric_m
Posted on Tuesday, May 16, 2006 - 08:50 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Does it have something to do with the fluctuation of air pressure with the low temperatures that the aircraft tires experience?
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Diablobrian
Posted on Tuesday, May 16, 2006 - 08:51 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The reason they use the nitrogen in aviation tires is because of the stability
of the pressure across a broad spectrum of temperatures.
As far as flammability, on airframes there is enough magnesium that I wouldn't
worry about the amount of air in the tires.

I wore a red shirt for a while. The Navy squids here will understand : )
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Jackbequick
Posted on Tuesday, May 16, 2006 - 08:51 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The water in the compressor tank is mostly because the air becomes hot when compressed and the moisture condenses out on the walls of the tank as it cools. The best way to eliminate moisture in compressor tanks is to cool the air back down to the ambient storage temp between the compressor and the storage tank.

I use helium in my tires to reduce the unsprung weight. You have to be careful at extreme lean angles when using helium though because the lifting forces in the helium will reduce the traction at the contact patch.

Jack
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Jackbequick
Posted on Wednesday, May 17, 2006 - 08:44 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Flight Ops on a carrier - arguably the most dangerous working environment in the world.

And the redshirts like Brian were the folks with the job of handling the explosive stuff.

I was one of guys that watched flight ops from up on "Buzzards Row". That was close enough for me.

Jack
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Kenny
Posted on Wednesday, May 17, 2006 - 12:20 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I wore a brown shirt,VMFA-115
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G4string
Posted on Wednesday, May 17, 2006 - 01:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Airplanes use nitrogen in their tires. The brakes on an airplane get extremely hot...the nitrogen is less succeptable to temp-pressure fluctuations. Once the brakes get hot, the nitrogen is supposed to help keep the tires from over-inflating and blowing up.

At a track day...nitrogen could be helpful. It would probabaly limit the amount of times you have to adjust air pressure. You could even mount a small Nitrogen bottle on your trailer or place it in your garage. A bottle is about 50.00 from any welding supply store. Then you need a regulator and a hose. another 50.00.

One thing to mention, ALWAYS keep the bottle secured to a trailer or your garage. If the protective cap that covers the regulator attachement point is off and the bottle falls over...it could quite possibly become a rocket. I have heard stories in the aviation community where this has happened. Try explaining to your wife why there is 12" hole in your house that starts at your garage and exits at the wall in your living room. Just be careful, you have 2500psi of compressed gas in a rocket shaped cylinder that wants to be set free.

IMO, with all the water in gas station air compressors, a small nitrogen rig in ones garage is probabaly the way to go. We wouldn't contaminate our bikes with bad gasoline or other fluids, so why contaminate our tires with bad air??
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Rr_eater
Posted on Wednesday, May 17, 2006 - 03:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Naval Aviation utilization of compressed nirogen:

1) Less temperture reactive than many gases, IE the brake heat and super-sub-zero temps at altitude experienced.

2) Non-volatile for reason of bulk tank storage, not use.

3) Non-reactive to natural and synthetic rubber compounds- this is because A/C tires can be stored, properly, for an almost infinite time. I know this to be true, as I have personally installed tires manufactured and built in 1996 (wheels and tires are built up and stored as an assembly aboard ships and other installations) on FA-18's in 2005.

4) If a tire should explode, as noted, it may help to not add to an already violent environment by adding fuel-air to a fire.

These are far out reasons to use N2 in an automotive environment, as they are subjected to far worse compounds and debris on the road.

To all the squids, I have been a brownshirt, white/black checker shirt, greenshirt, and now a full-systems whiteshirt on the FA-18E/F Super Hornet.

But these are just facts noted in naval tech manuals, what would they know!!! LOL

BTW, I use N2 in my bike and cars, as I was given a bottle/regulator/hoses years ago by my father, otherwise I too would use good old dried air.

Bruce

(Message edited by rr_eater on May 17, 2006)
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Missin44
Posted on Wednesday, May 17, 2006 - 06:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Nitrogen would be better than air for 2 main reasons.

1. Tire pressure will remain the same regardless of temp. Air will not, the colder the temp the lower the pressure, the higher the temp the higher the pressure.

2. There will be less leakage/loss of pressure, Nitrogen molecules (sp?) are larger, thus less leakage.
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Diablobrian
Posted on Wednesday, May 17, 2006 - 09:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I worked on type 1 (refrigerant) and type 2 (dessicant) dehydrators when i was in the navy.

You would be surprised how much moisture gets entrained in compressed air. We used to
have to test the dew point of our HP air (+1000 psi). At that pressure the moisture can
damage the air turbine starter on the emergency diesel generators.

We aren't talking about that much pressure, but that means it carries more moisture,
not less.
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Fullpower
Posted on Wednesday, May 17, 2006 - 09:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

this is a complete falsehood, from someone unfamiliar with boyle's law: "Tire pressure will remain the same regardless of temp". the truth is all gasses expand with increasing temperature, thus their pressure will increase if the gas in question is confined. ALL GASSES will do this.
it IS true that DRY nitrogen will expand less with elevated temperature than normal humid ambient "atmosphere". my ice racer will "gain" 4 to 6 PSI during a ten lap heat in the front tires, start with 20 or 22 PSI and after a race they are up to 26 or 28 PSI. the street tires on my Buell will run up a several PSI on the road, but this is not a big problem.
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Samiam
Posted on Thursday, May 18, 2006 - 09:08 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I wear a green "pickle suit", VP-1
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Dmextreme
Posted on Thursday, May 18, 2006 - 09:26 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

ROFL!!!

I would pay to see that.. and do the dance like the little banana icons you see on forums!!! HAHAHAHAH
Jerry
W Des Moines, IA
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Samiam
Posted on Thursday, May 18, 2006 - 09:36 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

"pickle suit" = flight suit

Sam
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Diablobrian
Posted on Thursday, May 18, 2006 - 04:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Just like skittles.

I'm surprised we don't have any blue or white shirts speaking up.

Red is predominantly fire fighting FWIW
We once had to push a burning air-frame
overboard because that's the only way we
could put the magnesium out. Nasty stuff
once it gets hot enough to catch fire.
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Samiam
Posted on Thursday, May 18, 2006 - 08:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

In my squadron, red shirts are "ordies", or ordnance handlers. White shirts are QA, quality assurance. Blue shirts are those learning to become yellow shirts, and yellow shirts are plane captains, the people who launch planes.

Sam
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Samiam
Posted on Thursday, May 18, 2006 - 08:43 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Now that I think of it, the ordies don't really wear red shirts in the manner we are speaking of, just red shirts under their coveralls.

Sam

What was the original topic anyway?
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Plsdks
Posted on Thursday, May 18, 2006 - 08:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Nitrogen in Aircraft Tires - I own a plane and the reason nitrogen gas is used in tires is because the nitrogen gas is dry and contains no water vapor. In an airplane at altitude, the ambient outside air temp at 30,000 feet can be 20º below zero even in summer. If tires are inflated with ordinary compressed air the moisture in the air will settle as a liquid in the tire and freeze at the low temperatures. Thus, when landing the tire will be out of balance due to the frozen water in the tire.
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Jackbequick
Posted on Thursday, May 18, 2006 - 09:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The A3 "Whales" were notorious for destroying tires and wheels on recovery. It was pretty spectacular to see what happens to a magnesium wheel when it is demolished on a night trap.

I was out on the Hancock one time and the Whales were destroying wheels with such regularity that when they passed to word to "standby to recover the whale" there would be a stampede to get up on buzzard's row to watch it.

Jack
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Diablobrian
Posted on Thursday, May 18, 2006 - 09:42 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The talk about Nitrogen in tires brought the aviation community into this thread in force.
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Rr_eater
Posted on Thursday, May 18, 2006 - 10:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Of course!!!

But a question for Missin, What is a nitrogen molecule smaller than?? Nitrogen?? Compressed air is comprised of about 80% Nitrogen and 20% oxygen (this is about you perfectionists out there!!). So does nitrogen leak faster then nitrogen??

Just a thought

Bruce
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