Clare, Xeno.... did you ever have a batch of tires that just wouldn't seal after the final bead?

[Clare Snyder]

OK - you are talking Pyrolysis - the same process used to form "wood gas" - which again ONLY happens on an OVERHEATED tire - due to either extreme overlood or low tire pressure (same thing, actually- as a tire's load rating decreases with lower pressure) The tire must reach about 200C - or roughly 400F for pyrolysis to occur. And nitrogen fill will not prevent a pyrolysis explosion because you can never keep ALL oxygen out of the tire. It may reduce the risk, but the PRIMARY reason for nitrogen fill is pressure regulation - Nitrogen molecules are larger and less likely to migrate out of the tire - thus holding pressure better - and since loss of pressure is a MAIN cause of pyrolysis, it WILL reduce pyrolysis problems.A properly inflated and loaded tire will NEVER reach pyrolysis temperatures and one of Otraco's main jobs is monitoring tire inflation and temperature.

Yea, what a "downer"!!!

[Xeno]

Their presence made life a lot easier for the haultruck fitters.

Indeed! LOL

[trader_4]

You don't have to keep all oxygen out of any environment like that to make it so that it can't explode. Below a certain oxygen fuel mix, it can't explode. It's like trying to fire an engine cylinder with a fuel/air mix that is too far off.

It may reduce the risk, but the

Actually I think the primary reason for using nitrogen in most applications, eg car/SUV tires is to put $$$ into the tire installers pockets. Most places charge extra, many ridiculous amounts.

[Kevin Bottorff]

Xeno [e-mail]> wrote in news: [e-mail]:

so this part is not true, truck tires usually blow from underinflation so they get hot and fail,(read tire has a leak) or the carcus has a mechanical failure. they run hot and under high load so failure is not to be considered abnormal, but low considering the amount of total miles run by trucks, and also retreads from the not so quality retreaders using poor carcuses is a factor. KB

[Arlen G. Holder]

Luckily these are normal rims for passenger tires.

BTW, while a half dozen tools & techniques were proposed, it seems the best is the "bazooka", where here's one guy showing how he crafted one from a spare "truck" air tank.