[Silvers]

Look at other plugins for examples. "expode" from "env_explosion" in Mutants (bomb type), or Flare Gun, or Pourgas, or Airstrike plugin. They all demonstrate one method. Another for replicating Propane tank would be using "prop_physics" and "break" input, see Greandes or Pourgas which does this using the firework /gascan models, just change to use propane model and you should have the same effect.