On Dec 15, 8:34*am, Larry Jaques
wrote:


I dunno, but it feels like an apple/orange comparison here. *

I can see that 400psi would blow out a lot of earth, but it doesn't
seem strong enough to lift a long, heavy, rigid pipe + earth unless it
had found a flame and exploded.

LJ--

Well let's see. A 30 inch dia pipe would have 30 times 12 square
inches or 360 sq inches per foot of length. That times 400 psi would
be 144,000 lb of force per foot of length or 72 tons of force per foot
of length trying to rupture the pipe. That might be strong enough to
lift one foot of pipe and the earth above it.

Dan