If you shut the gas off first, leaving the oxygen going,
more than a few torches will give you a really loud BANG... Shut
off the oxygen first, so you've then got a gas only gentle flame.
Then the gas gets shut off.
All, I realize a lot has already been written about this subject
but, especially for the newer members, this can be a very important
activity so we must get it right. Peter, have to respectively
disagree with comments at the top. You are correct about the ‘big
bang’, in fact such a bang occurs even when using a single gas torch.
Point is, it is a bang that occurs at the tip of the torch and it
means the flame has been blown away from the tip by the oxy.
I have done some additional searching and, lo, I found my ‘Little
Torch’ manual as well as a Smith, 'Instruction and Operation Manual
for Oxy-fuel Cutting, Welding and Heating Equipment.
First, the question of lighting procedures when using disposable
cylinders. Page 13 of the ‘Little Torch’ manual:
Open the fuel gas torch valve approximately 1/8 to 1/4 turn
Using an approved friction lighter or holding the top over an
approved Bunsen burner or candle, ignite the fuel gas.
Slowly open the oxygen torch valve (counterclockwise) until the
flame is nuetralized. This is accomplished by adding oxygen until
the bright cone off the end of the tip just reaches its shortest
Increase the fuel gas another 1/8 turn.
Again, increase the oxygen until the flame is neutralized. If
necessary, continue this procedure until the maximum volume of fuel
and oxygen are being used and the desired flame is achieved.
Having said all that, I agree with Robert, if you can get rid of the
disposable tanks, do it. They can eat your pocketbook!
Now for the second part…proper shut down procedure for torches:
Again, the ‘Little Torch’ manual, page 13 for disposable tanks, and
again on page 22 for other gases (including high pressure industrial
Extinguishing the Torch Flame -
1. Turn the fuel gas torch valve to the closed position (clockwise).
2. Turn the oxygen torch valve to the closed position (clockwise).
Finally, in the Smith Manual, pages 12, 13 and 17, Extinguishing the
Torch Flame (under various circumstances).
1. Turn the fuel gas torch valve to the closed position.
2. Turn the oxygen torch valve to the closed position.
There you have it friends.
Cheers from Don at The Charles Belle Studio in SOFL where simple
elegance IS fine jewelry! @coralnut2