One reason fuel gases are so useful is they easily ignite. That is also one reason they are so dangerous. A flame need not be present, a hot surface (only 600ºF) can do the job. These gases ignite at ...

Both the oxygen and acetylene hoses should also be purged prior to use. Acetylene is unstable above 15 psig and should never be set above this pressure. While lighting a torch, never use an open flame ...