Alan, I think most of us have done one thing or another that we wonder how we got away with it. Just the fact that propane is very finicky about when it will ignite is probably the saving grace. Propane needs a mixture of between 2.4 and 9.5% gas-in-air to be able to ignite. How many multiple times have we tried lighting our stove or gas grill. I worked in the natural gas industry for 38 years and have gained a lot of respect for the potential power of compressed gasses. You were lucky, but I would have been even more surprised if it did ignite. Good luck with the project.
Bob
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