Pipe dent remover

[TavisB]

Originally Posted by GasGas

Nitrogen is way safer as it does not expand like air. That is what my brother uses.

What? It expands just like air.

[noobi]

Originally Posted by TavisB

What? It expands just like air.

At low P and T, yes, it does behave according to ideal gas laws.

At higher P and T, like 100psi and 100s of degrees C, it deviates from ideal.

I think a bigger issue with using air is not so much the unideal expansion, but the combustibility of the compressed oxygen in air.
There's a reason you avoid compressing gaseous oxygen.

[Leo]

https://www.youtube.com/watch?v=sEefLnRLcRA

[TavisB]

Originally Posted by noobi

I think a bigger issue with using air is not so much the unideal expansion, but the combustibility of the compressed oxygen in air.
There's a reason you avoid compressing gaseous oxygen.

Yeah, that is my understanding as well.

[woods]

O2 isn't combustible. Regular air is 78% nitrogen. 21% Oxygen and trace gases.

Take a look at someone who has popped out pipes. 30 psi isn't much, only 3 atm.

[noobi]

Originally Posted by woods

O2 isn't combustible. Regular air is 78% nitrogen. 21% Oxygen and trace gases.

Take a look at someone who has popped out pipes. 30 psi isn't much, only 3 atm.

Technically its the oxidant. The steel pipe is the fuel.
Still incredibly dangerous stuff. You would probably get away with air, as the nitrogen would act as a suppressant, but using nitrogen instead of air is certainly safer.

30psi gauge is 2 atmospheres. There was mention of 80-100psi earlier in the thread.

[woods]

Never see it done at 100psi. The main danger you would have at 100 psi would be the pipe blowing up in your face when heated cherry red. You are not going to get a fireball or anything. Just metal blowing up in your face.

30psi is 3 atm as most gauges measure from one. 3 on the inside pushing against one from the outside. Guess we can argue that.

Originally Posted by noobi

Technically its the oxidant. The steel pipe is the fuel.
Still incredibly dangerous stuff. You would probably get away with air, as the nitrogen would act as a suppressant, but using nitrogen instead of air is certainly safer.

30psi gauge is 2 atmospheres. There was mention of 80-100psi earlier in the thread.

[Elvis74]

My experience ist not the air pressure is the secret to remove the dent, it's this heat. I always used the normal small gas lamps like in the video with no good results. Last time I used a butane burner which gives much more heat and a larger area of heating. It works much better and easier to remove the dents.

[swazi_matt]

the guy i use, uses water in the pipe

[bkwdc]

Got word that Brett with BonJoesCycleSport would be at the Little Brown Jug AMA national enduro this past weekend. So I took my 2 worst pipes. One was almost flattened at the largest diameter.
Report; nice guy. Professional. Did an unbelievable recovery on very bad pipes at a great price.
Absolutely recommend.
716-773-5800
http://www.bonjoescyclesportinc.com
Or you can continue to screw around in your garage and put your eye out while leaving ripples and dents.