Periodically someone manages to blow the side of a house in with a 
propane grill, too.  Compressed hydrocarbon gasses are rather 
dangerous, and will burn on contact with air and an ignition source -- 
and will explode if conditions are right.  Rather messy, the military 
uses propane tank airburst bombs to flatten large areas.  Works better 
than big ship projectiles.

Use caution with hydrocarbon refrigerants, especially watch charging 
and charge only by pressure, not weight.  They weigh MUCH less than 
halogenated equivalents, so you must watch the pressure, not the weight 
or you grossly overcharge (overpressure) the system and something will 
let go.  Hydrocarbon gasses ignite on contact with oxygen (i.e. air) 
above 450 degrees F instantly, no need for a spark.

The exploded compressor could have been just serious overcharge (I saw 
pictures and know the individual).  He picked up chunks of the housing 
off the freeway -- the rear half split into several sections and the 
pistons blew out.  Quite a loud "bang".

Note that a slow leak will permit oxygen and nitrogen to enter that 
"closed" system through boundry layer migration -- I battle this all 
the time with gas chromatorgraphs.  A minor leak out allows a smaller 
leak in along the surface of the containing material --- it diffuses 
through the nearly stationary atoms next to the metal pipe, rubber 
hose, etc.

Peter


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