[A/S] OPD valves and Propane

["Thomas Dickieson" <lleather@xxxxxxxx>]

Hi Y'All;

We don't require OPD valves in all our tanks yet in Canada, but I can 
see it coming, so the info I am picking up here is fantastic.  
Propane is not quite as volatile as most people think though.  I had 
to take a propane course in order to fill the tanks on two taxi cars 
that I owned, and in order to provide a dangerously flammable or 
explosive situation, leaking propane has to be contained in a space 
into which it can leak, but not escape or mix with enough air to keep 
it below critical mass.  If left out in the sun on the patio for 
instance, and leaking off the excess, there would be no danger of 
fire or explosion.  If the leaking propane however (as it is heavier 
than air) were to move downwards into the house, and leak enough into 
that space, THAT would possibly become a dangerous area.  If the 
leaking tank was actually in the house, and the doors and windows 
were closed - then that would DEFINITELY become a hazard.  Bombs away.

Tom