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Old 06-23-2017, 07:22 PM   #1
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Nitrogen for air in dinghy?

Ok, so my new car uses Nitrogen for air in the tires. Apparently race drivers are now using this in their cars due to the stability of the air pressure. Pressure doesn't change due to tire temperature changes.
I started thinking if anyone has tried this in an inflatable dinghy to prevent all the soft to hard tubes all the time??

Anyone heard of this or would it be too expensive to fill?
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Old 06-23-2017, 07:42 PM   #2
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Ok, so my new car uses Nitrogen for air in the tires. Apparently race drivers are now using this in their cars due to the stability of the air pressure. Pressure doesn't change due to tire temperature changes.

I started thinking if anyone has tried this in an inflatable dinghy to prevent all the soft to hard tubes all the time??



Anyone heard of this or would it be too expensive to fill?

Hum, it's been a long time since I learned this stuff, but isn't the pressure of a gas just a simple relationship between volume and temp? I don't recall the type of gas making any difference. Someone must be more current on this than I am......
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Old 06-23-2017, 07:45 PM   #3
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Nitrogen is already over 70% of the air.

It's got nothing to do with stability and everything to do with moisture. Aircraft use nitrogen because it comes in bottles and is dry. You don't want moisture in a tire you carry to -65 degrees. You also don't want a compressor way out on the ramp for checking tires and nitrogen is also used in hydraulic accumulators. For race cars I would bet it's for the portable bottles and the wish for no moisture. For cars, it's a marketing have, you get to wear a little green button on your tire which makes you cool and trendy. If you spent money for nitrogen, give me a call, I have a really nice bridge for sale...
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Old 06-23-2017, 07:46 PM   #4
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Greetings,
Mr. T. Air is 78% nitrogen. I suspect that racing tire pressures are somewhat more critical than dinghy pressures or even regular car tires. My personal feeling is filling your car tires with nitrogen is more of a gimmick than anything else. In fact, I think, internal pressure DOES change with temperature just over less of a range with pure nitrogen.

Mr. tt. "...the type of gas making any difference." You could be correct in that. It's been a long time since physical chemistry although I DO remember the prof.- Dinesh Bhatnagar. I can still hear him say "PV=nRT" but have forgotten mostly everything else. Good ole' Dinesh...
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Old 06-23-2017, 08:10 PM   #5
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Xsbank is right would do you no benefit in a inflatable boat
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Old 06-23-2017, 08:11 PM   #6
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There is a rule for passenger aircraft using nitrogen in braked wheels to use nitrogen. Not for loss of gas due to seepage or pressure stability with temperature, but simply to be more fire resistant. I would assume the same for race cars.
In car tires, the theory is the big vs small molecule thing; driving seepage loss.
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Old 06-23-2017, 08:17 PM   #7
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N2 in a dinghy would be a hassle and a waste of time. No gain over plain old air.
Sure would impress someone at the dock though.
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Old 06-23-2017, 08:20 PM   #8
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Could liquid nitrogen serve a positive usage on our trawlers?
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Old 06-23-2017, 08:24 PM   #9
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Great ...
Get out of your dinghy and it floats up in the trees.
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Old 06-23-2017, 08:28 PM   #10
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Greetings,
Mr. mp. "Could liquid nitrogen serve a positive usage on our trawlers?" Other than shrink fitting mechanical parts and keeping ice cream WAY too cold I really can't think of ANY uses aboard. Aside from it's inherent danger (used medically for removing warts, skin lesions etc.) due to it's extreme cold it is VERY difficult to store smaller amounts for any appreciable length of time even in the best Dewar flasks.
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Old 06-23-2017, 08:28 PM   #11
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Why not use helium then?
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Old 06-23-2017, 08:40 PM   #12
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I keep a cryogenic chamber aboard in case I croak at sea and maybe can be revived once in port....

Nothing too good for the captain.

But it did bump me over the 10% rule for annual maintenance.

Liquid niitrogen is expensive to keep.
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Old 06-23-2017, 09:21 PM   #13
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I once considered liquid Oxygen to bring on long dive trips to the islands to pump for nitrox. There are small cryo systems out there. But, the gas keeps seeping out the system; gone in a couple weeks. So, back to 250cf steel bottles.
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Old 06-23-2017, 09:41 PM   #14
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It's my understanding that whale fart gas is the most desirable of all gasses for inflatables.
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Old 06-23-2017, 09:44 PM   #15
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I think I'll color my dinghy caps green just to impress people.
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Old 06-23-2017, 10:04 PM   #16
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The only use I can think of for nitrogen in our wheel house is if you have a keel or a cored deck that is wet. Running nitrogen through it will wix out the moisture. Case in point: Wet telephone cable (usually under a street, buried or no more ducts) put a liquid nitrogen tank on one side of the street and tube it into the cable, a metered valve on the other. Then adjust the regulator and metering valve and let it blow through the cable for a few days-weeks. Will dry it out nicely. This will work on cored decks, hulls or keels.
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Old 06-23-2017, 10:08 PM   #17
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It's my understanding that whale fart gas is the most desirable of all gasses for inflatables.
EPA banned it. Global warming problem.
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Old 06-23-2017, 10:30 PM   #18
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Hum, it's been a long time since I learned this stuff, but isn't the pressure of a gas just a simple relationship between volume and temp? I don't recall the type of gas making any difference. Someone must be more current on this than I am......
As I recall, it was Boyle who thought so. I do carry a large (industrial sized) tank full of helium -- we use it for fishing.
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Old 06-24-2017, 12:33 AM   #19
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Guys, the only point of using nitrogen in anything you pump up is the absence of oxygen, thereby the material containing it, usually a type of rubber, is less attacked by oxidation, so lasts a bit longer. No other gain, other than no oxygen. No difference in pressure changes due to temp changes, no real flammability benefit - just the slightly longer tyre life. Useful in some situations, eg, of very expensive (read large) tyres. Not much in anything else.
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Old 06-24-2017, 12:39 AM   #20
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Oxygen molecules, are smaller than nitrogen molecules, so oxygen can escape through a car tire, because there are very small, pores in the rubber. But nitrogen molecules that are larger in size, can not. That's why they use it in racing. Racing causes higher stress, to all materials, and can be compared to a personal vehicle during a longer time. So i believe a rubber dingy could last its pressure, for a longer time. But it is not worth the money, and because living on a trawler, is not anything close to run a marathon, I think using the foot pump won't kill you.
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