this site has a warning about not turning gas cylinders into rockets.
http://www3.airproducts.com/productstewardship/product-safety/safetygrams/sf
grm14.pdf
What are the pressure hazards associated with
compressed gas cylinders?
All compressed gases are hazardous because of
the high
pressures inside the cylinders. Gas can be
released deliberately
by opening the cylinder valve, or accidentally
from a broken or
leaking valve or from a safety device. Even at
a relatively low
pressure, gas can flow rapidly from an open or
leaking cylinder.
There have been many cases in which damaged
cylinders have
become uncontrolled rockets or pinwheels and
have caused
severe injury and damage. This danger has
happened when
unsecured, uncapped cylinders were knocked
over causing the
cylinder valve to break and high pressure gas
to escape rapidly.
Most cylinder valves are designed to break at
a point with an
opening of about 0.75 cm (0.3 inches). This
design limits the
rate of gas release and reduces cylinder
velocity. This limit may
prevent larger, heavier cylinders from
"rocketing" although
smaller or lighter cylinders might take off.
Poorly controlled release of compressed gas in
chemical reaction
systems can cause vessels to burst, create
leaks in equipment
or hoses, or produce runaway reactions.
Roy
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