tire explosion problem help

I understand you need a chart pressure - required time to fill something with air at specific pressure. Why you do not buy an air gun or other device with air pressure gauge attached that can show you continuously the pressure inside the tire? It easier and practical.

Second: assuming you work for a company where you use to fix the tires, why you do not build a steel safety cage to put the tire into it during the inflating procedure. In case the operator fail to disconnect and the explosion occurs at least the worker is not hurt.

A regulator at compressor tank output would suffice

I agree this sounds strangely like a homework problem. I think he used the exact text from the book. What is this for, Fluid Dynamics?

So, its not mandatory to fill tires while already in a steel "safety cage" ?

I know most of the tire dealers in the area where I live have those safety cages, wether they use them or not is a different story

Hell!Safety cage an obvious and good idea.

Nonetheless, I live in Atlanta and have never seen anything of the sort, big shop or small shop.

Is there a code specifying such anywhere?

j.

Surprising!

You do not have pressure regulator which continuously senses pressure in tyre. It releases pressure, even if the pressure rises beyond set pressure by any reason (by overshoot/undershoot phenomenon)

I hope you are not from underdeveloped country.

Here in India, I do not think, such accidents are there, thanks to pressure regulators.

It seems that becoming an engineer these days is no longer worth the paper its printed on. These guys try to get there projects done on this site without having to apply their minds. What kind of engineers will they make?????

Probably this person will make a good engineer. He/she knows when to ask questions. I for one am all for brainstorming. I like it. D

Hands on type

Obviously, by the answers being provided by some individuals; this represents a real challenge for the "engineers" which also have some type of schemas. I am out.

Obviously, by the answers being provided by some individuals; I (we) recognize that this is sounds like a home work assignment and do not wish to go through school again. Possibly answers would be different if the question was asked stating whether or not it was a real world problem or homework. Could be I am wrong. It happens occasionally. I at least signed for my reply. Why didn't you?

agreed

Whats the cubic inch inside the tire?

What is the atmospheric pressure at sea level.

How many cubic inches of air are needed to raise the pressure 1 atmosphere, or whatever is required?

What is the rate of flow into the tire?

What is the stored pressure?

As pressure inside the tire increases, will the rate of inflation slow down or stay the same?

Just a few things to consider while doing your homework!

I think "The Mechanic" has given you the most reasonable answers to your question, but I wonder if everyone has missed one thing. The rim in question was nylon and not steel. What are the manufacturers specs. on that rim. I have never seen a nylon rim. Also sounds like it may have been one of those emergency doughnut spares ,rather than a full size tire mounted on a steel wheel. Either way there should be manufacturers specs. on both the rim and the tire. Also, you can never rule out manufacturers defects in both tire or rim. That is why you should use the safety cage, but I have watched while tires were mounted on my car at a local tire dealer where a man was killed several years ago, due to an exploding tire and they still did not use the cage.

great question even better replies but one i ask is who has been the person able to come up with a high presured rim mount tyre made out of nylon or any other composite material for that matter that has the physical dimensions you have posted?

what is the actual end use of the entire rim assembly to be?

does the tyre have a inner tube, what are its chemical and physical characteristics?

/da ber

Most people (including myself) never think about the calculations asked about here but rely on a pressure gauge to tell them when they have enough air in a tire. I guess someone at some point did allot of figuring on the pressure capacities of different tires and came up with marking each tire with an appropriate pressure so people would not hurt themselves. Those tire cages you see sometimes in shops are for the old split ring type rims and I think the reason you hardly ever see them being used is that no makes those rims anymore. I remember a local tire guy got killed back in the early 80's from one of those rings becoming a missile when he was installing a tire. The things seem to pop off right when you look over the tire to re-install the valve stem after airing up the tire. It seems to me that it was about this time that the steel cages were starting to be used. Back in the late 80's a buddy had a flat tire on his welding truck out on his farm in south Texas and was no where near an air pump. After thinking awhile he came up with the not so smart idea of filling the tire with compressed oxygen from his cutting rig on the truck. He said that he had seen it done before and it worked fine that time so he gave it a try. He woke up in intensive care in the hospital 6 weeks later and was told he would never hear anything again. His father in law that was standing near when aired up the tire nearly lost his leg when a piece of the truck hit him as well. I have read where some people use other compressed gases than air in their tires and I know this may be considered off topic but but I would like to tell everyone not to put oxygen in a tire.

pipewelder

If the person filling the tire can not use a pressure gauge, what makes you think they will not override the timer you want by pushing the start cycle again. A sealed pressure regulator is what will stop over-pressure explosions. A safety cage is what will stop catastrophic explosions from defective products.

tashkent,

The question is subjective, where is the data on the nylon rim??

How will increased safety of the worker will come from this?

tashkent,

compressor cubic feet per/minute etc.?

The Mechanic I believe has nailed it shut.

In real world conditions regardless a regulator at the compressor out put set @ 2% less than maximum specified tire pressure would suffice, no matter if tech spaced the time frame for fill.

back in the 60's I saw a film by Goodyear or Firestone about what can happen while filling tires and what damage can be done to a cage if a spit rim is mounted improperly I still today do not like to fill a large tire and on small tires I keep my fingers away from the rubber i want to keep them

nitrogen is now starting to be used to as a filler

nick

ca.

Tire explosions are still a very real problem. Regulators, and timers are all well and good. But what pressure is safe if that aluminum or plastic wheel has bounced off of a curb? What about that pothole that just popped the tire of the rim? What will happen when you put 44PSI in that rim ? Those cages are what will keep you walking, not a stopwatch. In November Fort Lauderdale Airport decided to replace the inflated tires on the jet-ways with solid tires. There was a three man crew that was changing out the tires. The procedure that was written called for jacking up the wheel, deflating the tire, then drilling a hole in the sidewall to be sure there was no pressure.

One jet-way had a flat tire. The crew decided to skip the drilling procedure because the tire was flat. The style of rim on these jet-ways is a two piece design, similar to a golf cart tire. The two halves just bolt together with the same bolts that hold the wheel to the axle. After removing about half of the retaining bolts the rim split in two. One man, who weighed over three hundred pounds, was hit in the leg with the rim half. He lost his leg above the knee, and had broken ribs and other cuts and bruises. Rick was behind him and was thrown back into the truck, knocking him unconscious and bruising him badly. Jeff who just barley weighs one hundred pounds, was thrown over the hood of the truck, landing twenty feet away. He was not aware of how or why he was on the other side of the truck. It took rescue crews ten minutes to realize he was injured in the accident. Part of the reason for the change in tire style was that the maintenance people were not comfortable with the inflation procedure. They could not put the tire in a cage. They had to rely on chains to prevent tire explosions.

The tire on that jet-way was thought to be flat. The tire was low enough to let the rim touch the ground, but still contained enough nitrogen to do this.

How much good would a timer have done here? USE THE CAGE!

http://exploration.grc.nasa.gov/education/rocket/mflchk.html

http://www.grc.nasa.gov/WWW/K-12/airplane/mflow.html