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Post by warlock^_^ on May 23, 2007 10:31:42 GMT 8
OT: I just checked the website of the company that supplies most of the compressors installed on our projects...they have this interesting topic related to Nitrogen use in Tires. It mentioned Vit's permeability & diffusion theory. Nitrogen Tire Filling Systemrench, as for enzo's claim on deflation if the water condenses. Its true...though not really a significant loss of gas volume depending on the humidity of course of the ambient air.
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Post by Ben Dover on May 23, 2007 11:11:21 GMT 8
i think that enzo's experiment is sound if only to prove the permeabilty "theory" of rubber tubes...but i believe its already an accepted fact among the concerns (tire manufacturers) etc.
if there is no presence of bubble inside the countainer after it was sealed (given that it was properly sealed) then the mere existence of a bubble after sometime will indicate so...or if there was a bubble before then an increase in the measured volume of the bubble will tell the same...of course, it should be given also that the pressure inside the tube is much higher than the pressure of water inside the container surrounding the tube.
my 2 cents.
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Post by enzo on May 23, 2007 13:17:11 GMT 8
Guys,
There was an issue or mentioned about tires losing pressure every now and then and since its a problem or a raised issue, im trying to find the solution or get to the root of it. Who said he is going to carry or lug it on their jersey pocket. A test like this will require a big bottle to accomodate the tube and and long hours to find out the speed of the defletion. Im a mechanic, and I pump hundreds in a months and thousands in a year so i use compressors 99 percent of the time. I f you think this will not benefit us, then suits you, maybe this will benefit us mechanics who use compressors and who pumps up the bicycles or tires we service. And dont tell me this OT or irrelevant cos whatever is the outcome of this will benefit us, cyclist. I guess you are all looking at the other way rather than reading the post thouroughly.
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Post by enzo on May 23, 2007 13:26:36 GMT 8
Lamok,
Great, thats what I need, a 2 cent that will help alot. Im actually overinflating the tube. Lets see. The idea of the sealed container came to me so I can see the amount of air or volume. I cannot wait there all the time. unless I wait for that long or camera that they use for long hours. Right now I dismantled my baby compressor and there was like a cupfull of water inside, im tryiing to find out how much exactly are the moisture/water that goes in to our tube. Or maybe i will just cover the top with plastic wrap for expansion coz the upside down sealed bottled will have a higher pressure than inflated tube. See! these are the 2 cents that actually helps. Thanks Lamok.
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Post by dont on Jun 3, 2007 1:51:09 GMT 8
What do you think of this TEST? yeah, enzo...but still beat us since they can lug it on their jersey's back pocket ;D I cant strap mine on the frame... I got a small bike frame (hobbit size) oh..by the way guys...drop the permeability thing. All the losses are always thru the valves. Sorry to Disagree sir..But permeation cannot be ruled out here..I am a Chemical Engineer myself and like you I am amused about the discussion here.
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Post by enzo on Jun 3, 2007 17:53:39 GMT 8
Cool! Now we have all em Engineers in the house to help me. Im just a bike mechanic so you will all be very helpful to me in solving real life/bike shop situations and problems in a more technical way.
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Post by dont on Jun 7, 2007 18:39:52 GMT 8
Cool! Now we have all em Engineers in the house to help me. Im just a bike mechanic so you will all be very helpful to me in solving real life/bike shop situations and problems in a more technical way. So what's the outcome of the experiment..I am interested also to find out. The amount of water that condenses inside our tubes is a function of the Humidity during pumping & the final Pressure at which we pumped our tires. As the tube cools. more water is expected and when the tubes warms up..water again is vaporized inside the tube. The ratio of Gas permeation between Nitrogen and Oxygen is 1:4. So somehow replacing air with pure nitrogen has some advantages.
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Post by enzo on Jun 7, 2007 19:14:41 GMT 8
Cool! Now we have all em Engineers in the house to help me. Im just a bike mechanic so you will all be very helpful to me in solving real life/bike shop situations and problems in a more technical way. So what's the outcome of the experiment..I am interested also to find out. The amount of water that condenses inside our tubes is a function of the Humidity during pumping & the final Pressure at which we pumped our tires. As the tube cools. more water is expected and when the tubes warms up..water again is vaporized inside the tube. The ratio of Gas permeation between Nitrogen and Oxygen is 1:4. So somehow replacing air with pure nitrogen has some advantages. Since i thought about this test,I started opening my compressors and end up overhauling them. Im so busy I cannot even clean my my bike, pimp it, go for haircut, and other stuff. I even missed the concert of AEROSMITH Read somewhere, I hope I see Aerosmith before I die, I hope I see them before they die.
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Vit
Bike Commuter
4 years smoke free
Posts: 56
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Post by Vit on Jun 16, 2007 14:21:26 GMT 8
Since i thought about this test,I started opening my compressors and end up overhauling them. Im so busy I cannot even clean my my bike, pimp it, go for haircut, and other stuff. I even missed the concert of AEROSMITH AHHH! That is called PASSION!
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Post by chubs914 on Jan 25, 2008 22:29:32 GMT 8
Make it a habit to check the tire pressure before riding. Invest in a good floor pump. i suggest Topeak Joe Blow. It retails for P950.00 in quiapo. Likewise, buy a mini pump for on the road emergencies. I don't suggest the brand (MOB) you are currently using. True, its cheap. But look what it did to you. Try the Topeak Mini Pumps. Retails for about P800.00. Its worth the investment if you're taking cycling seriously. Hope your injury is better now.
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Post by kulot_salot on Jan 25, 2008 23:05:30 GMT 8
enzo mah man, i thought that was your spilled coffee... with brown sugar... and with too much creamer.... ;D ;D ;D So what's the outcome of the experiment..I am interested also to find out. The amount of water that condenses inside our tubes is a function of the Humidity during pumping & the final Pressure at which we pumped our tires. As the tube cools. more water is expected and when the tubes warms up..water again is vaporized inside the tube. The ratio of Gas permeation between Nitrogen and Oxygen is 1:4. So somehow replacing air with pure nitrogen has some advantages. Since i thought about this test,I started opening my compressors and end up overhauling them. Im so busy I cannot even clean my my bike, pimp it, go for haircut, and other stuff. I even missed the concert of AEROSMITH Read somewhere, I hope I see Aerosmith before I die, I hope I see them before they die.
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Post by enzo on Jan 26, 2008 1:05:11 GMT 8
Jaymz, Too busy !!!! So many things to do so little time ;D
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Vit
Bike Commuter
4 years smoke free
Posts: 56
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Post by Vit on Jan 27, 2008 18:50:57 GMT 8
Make it a habit to check the tire pressure before riding. Invest in a good floor pump. i suggest Topeak Joe Blow. It retails for P950.00 in quiapo. Likewise, buy a mini pump for on the road emergencies. I don't suggest the brand (MOB) you are currently using. True, its cheap. But look what it did to you. Try the Topeak Mini Pumps. Retails for about P800.00. Its worth the investment if you're taking cycling seriously. Hope your injury is better now. Thanks, brad. I'm feeling better now. Not because I've started using the floor pumps or stop using my mini-pump...but only because it has been almost a year already since and I've not been road biking that much recently. Still i look forward to riding my road bike and really am looking for a floor pump
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