On Sun, 04 Jan 2004 23:10:56 GMT, (QrizB) wrote:

Not true. Think about the phase diagram. At temperatures above the
triple point of LPG, the vapour can have the same density as the
liquid.

Triple point is -190C

A quick calc suggests that the gas will compress to the same density
as the liquid at about 300bar (needs checking). Keep your pressure
above this and you would see no difference. Of course in practice if
you keep the pipe runs away from the head the heat exchange surface at
the injector will simply not transfer enough heat to cause a problem.
On stopping the gas would just occupy a small section of the injector
pipe which was above 97C.

AJH