Mike4 wrote:servodude wrote:
Sounds a bit dodgy geezer?
Dunnit just!!!
Getting a cavern of 0.1 cubic kilometres in volume totally pressure-tight sounds like quite a project.
Out of interest, can you or anyone post up the calcs to work out the pressure required for the boiling point of water to reach 140C?
I'd imagine most of the difficult bit is at the top (given how giant holes work)
I think this https://www.engineeringtoolbox.com/water-vapor-saturation-pressure-d_599.html?vA=140&units=C# suggests 3.6bar (52.5psi)
- which isn't all that high
I've had to seal irrigation outlets at 5 bar before - using battery powered linear actuators pushing plate steel against concrete and they were capable of 7bar (granted though closing the last half an inch would probably have stripped your ankles off if you'd been standing too close)