I have only been using a torch for two years so I am not an
expert...yet. I have had two leaky tanks lately and that has given
me the creeps.
This is my biggest complaint about acetylene for jewelry studio use.
When we get a small tank (B or MC size are the main culprits) from
the supplier it is typically been used and abused for many years in
the construction trades. Hauled around in the back of trucks dragged
through job sites and in general knocked around. Since they are used
outdoors or in a new construction area a little leak is sometimes
not noticed or ignored and not reported to the gas supplier. When we
get one of these tanks and set it up in the studio we have to deal
with an abused tank and valve that often leaks, then to call for a
new tank to be brought out and deal with the lost time etc.
The tank I just got does not have a leak, I've tested it with
bubbles. I have an acelylene tank with a prest o light torch. When
I turn the tank off, and the handle off, the gauge/regulator does
not drop to zero. I have a single gauge on the tank.
Are you opening the torch valve after you close the tank valve to
vent the regulator and hose? Your procedure should be as follows
(1) Open acetylene cylinder valve 1/4 to 1/2 turn.
(2) Open torch valve 1/4 turn.
(3) Screw in regulator adjusting valve handle to working pressure.
(4) Turn off the torch valve (this will purge the fuel gas line).
(5) Open torch valve 1/4 turn and light with lighter.
NOTE Use only friction type lighter or specially designed lighting
device. NEVER use a butane lighter.
Always use the following sequence and technique for shutting off a
(1) Close torch valve
(2) Close fuel gas cylinder valve.
(3) Open torch valve to release pressure in the regulator and hose.
(4) Back off regulator adjusting valve handle until no spring tension
(5) Close torch valve.
If your regulator is still indicating pressure after this procedure
it is in need of servicing. If the regulator goes to zero but then
climbs back up your acetylene cylinder valve is not sealing and is
leaking into the regulator, get a new cylinder.
James Binnion Metal Arts