If you can access a oxy/acetylene torch, using a very small(0 or 00) welding tip set at a neutral flame, heat the nipple up to cherry red. If the torch is set correctly , a few seconds is all it should take to bring the nipple up to temperature. Flame should be applied directly to the round part of the nipple, not the flat, wrench contact area.
Once heated up to temperature, the nipple should screw out.
This will, of course, ruin the nipple but will that matter?
A propane or MaPP gas torch will not work as the flame is too broad and will heat the whole cylinder along with the nipple.
The oxy/acet small tip will provide high heat in a concentrated flame so that you can heat just the nipple.
The cylinder will see some heat, but if done correctly not enough to cause any harm.
Once heated up to temperature, the nipple should screw out.
This will, of course, ruin the nipple but will that matter?
A propane or MaPP gas torch will not work as the flame is too broad and will heat the whole cylinder along with the nipple.
The oxy/acet small tip will provide high heat in a concentrated flame so that you can heat just the nipple.
The cylinder will see some heat, but if done correctly not enough to cause any harm.
