Thread: Heat and exploding tyres!

Originally Posted by Ueee

If you have ever seen the myth busters do this it is freakin scary.

Its unfortunate that so many rely on Mythbusters as a reliable source of creditable information.
Some of their tests are subject to way less rigor "normal" science would demand.


My students would not be convinced that banging hammer faces together was a harmless activity after MythBusters conducted tests on some hammers and pronounced the myth busted.

The half dozen metals industry tradies with whom I have been in some way connected with, either still have hammer chips chips embedded in their bodies / or have had surgery to remove , may beg to differ.

But you are right ,as far as HW systems are concerned, we should purge the HW relief periodically as one never never knows when one of the mud dauber wasp ( little basterds) have made a deposit.

Grahame

Originally Posted by Grahame Collins

Its unfortunate that so many rely on Mythbusters as a reliable source of creditable information.

As I understand it they seem to have missed the point on that myth, it was never a "one hit" deal as I understood it.(how hard would you need to hit a cold chisel to mushroom the end and break a chip off with one hit?)

I often think they set out to stuff it up the first time so they can "revisit" and get two shows for the price of one.

I just wish they hadn't filled the balls of their Newtons cradle with concrete.

Even if the relief line is block the PTRV will whistle at you if it gets the chance.(do they all have whistles?) I wonder how often the system fails somewhere else first? (though granted I wouldnt what to be around to find out.)

Stuart

Now that we are off thread and talking about mushroomed cold chisels. When I was an apprentice I was chiselling a piece of metal in a vice when I heard a chip of my chisel hit the corrugated iron wall but I just carried on until every thing got slippery and I discovered the whole job was covered with blood. It had cut my arm in passing without me felling a thing. Wonder what a direct hit could do?
Regards

A long while back probably in the eighties I was requested to weld on a rim that had a tyre mounted on it. In those days people expected that if you had a welder you could weld anything.
I knocked it back as I thought the rim may have been heat treated and was leaving myself open to to any court action if any accident had happened.

Certainly now it is one of those HMMM! moments.

Grahame

Originally Posted by Grahame Collins

Its unfortunate that so many rely on Mythbusters as a reliable source of creditable information.
Some of their tests are subject to way less rigor "normal" science would demand.


My students would not be convinced that banging hammer faces together was a harmless activity after MythBusters conducted tests on some hammers and pronounced the myth busted.

The half dozen metals industry tradies with whom I have been in some way connected with, either still have hammer chips chips embedded in their bodies / or have had surgery to remove , may beg to differ.

But you are right ,as far as HW systems are concerned, we should purge the HW relief periodically as one never never knows when one of the mud dauber wasp ( little basterds) have made a deposit.

Grahame

There was a case that a Firefighter told me about where they were called to an explosion. Upon arrival, they thought that someone had indeed placed a bomb in the back part of a house, which had exploded and demolished the back wall and caused general carnage. Luckily there were no casualties.
The cause was found to be a slow combustion wood heaters hot water cylinder. Some numpty had put shut off valves on all inlets/outlets including the overflow. Upon the stove heating the water, a very efficient bomb was created, (water expands 1700X as steam).
I have also attended car fires where the tailshaft has exploded - lays them open end to end.
Ah, the joys of stored energy.

Was doing a small Sunday afternoon job in my workshop, which was about 100 metres from the tyre bay of a trucking yard across the road. Suddenly a helluva Boom came from that direction and I looked up to see a large dust cloud in the air. Grabbed my phone ready to call an ambulance and dashed across to see what had happened. Was met by the caretaker guy coming over from his quarters looking very puzzled. No sign of casualties or any great disturbance. Then he noticed seveal truck tyres and rims away across the yard. He was sure the work crew had left four inflated super single tyres on rims the previous afternoon to have new tyres fitted. One was still where they were left, in the dust on a tropical 45*c day, but the tyre was shredded. It must have burst and launched the other three to all corners of the yard, over the top of a number of trucks and machines. The burst tyre had landed almost where it had launched from. Extreme luck that it was Sunday and no one was in the yard.
Amazing how much energy is contained in a truck tyre at 100 psi even without the reaction of welding or similar heat on the rubber. I treat them all with respect now! Combustor.