"willshak" <
will...@00hvc.rr.com> wrote in message
<stuff snipped>
> Actually, propane scares the shit out of me. 2 incidents come to mind.
> 1. Back about 1963 I lived 2 streets up a hill from a small propane tank
> farm on Rt. 9W in Congers, NY. I could see parts of the farm through the
> trees from my house. One morning, my wife awakened me to tell me there
> was a fire at the farm. From our front yard I watched grill sized
> propane tanks spewing fire being launched in all directions, one coming
> close to hitting my house. The larger tanks did not fly so far, but
> their screw-on caps did.
You're right to be wary: Those were BLEVE's - Boiling Liquid Expanding
Vapor Explosions. Depending on the circumstances, they can fly pretty far.
Firemen really dislike fighting such fires because of the danger of tanks
and parts becoming mini-rocketships, propelled by superhot gas exiting the
relief valve (or sometimes the hole where the relief valve used to be after
the relief valve has rocketed off).
http://www.firenuggets.com/dunnsdispatch/dunnsdispatch3.htm
says:
<<The distance that a piece of steel can be blown away from the explosion
depends, in part, on the size of the container and the amount of liquid
petroleum gas stored inside. BLEVEs of large tanks have blown metal pieces
up half a mile away from the explosion. Firefighters who were 800 feet away
from such a BLEVE have been killed by hurtling tank parts. Obviously, a
small cylinder will not cause shrapnel to travel as far as will a large
propane tank; however, firefighters directing a 30- or 50-foot hose stream
to cool down exposures are within the range of rocketing projectiles and
could be killed or seriously injured.
The distance covered by metal shrapnel from an exploding propane cylinder is
also dependent on which section of the cylinder fails. If the cylinder
remains in one piece and only the control mechanism and valve blow off, that
cylinder will travel farther than if the tank splits into two large
sections. A small piece of rocketing cylinder such as a control handle
mechanism is not unlike a bullet or cannon ball. If, on the other hand, the
propane cylinder splits apart or tears open at the seam, the large chunks of
metal may not travel as far away from the explosion site; however, this type
of cylinder rupture creates a larger fireball . . . In Brooklyn, New York,
one 20-pound propane cylinder exploded in the cellar of a plumbing supply
company. The explosion and ensuing shock wave collapsed three two-story
buildings, killing four people. Five years ago, in Buffalo, New York, the
shock waves of an explosion caused by a leaking propane cylinder collapsed a
200- by 100-foot brick building, killing five firefighters; propane gas was
a suspected cause of the 2001 explosion and building collapse that killed
FDNY firefighters Harry Ford, John Downing and Brian Fahey.>>
I think I might look into storing my 20 pound bottle somewhere safer than it
is now. I'd keep it in the shed except I use it only to melt ice from the
steps. Putting it in the shed means carrying it up an icy hill. Hmmm.
--
Bobby G.