I'm pretty sure Mr. Rush didn't understand what 400 bar means. It's 4x the typical pressure inside a gas cylinder as used by industry.
100 bar is at the low side. Recreational divers use compressed air at 250 to 300 bar. Commonly used industrial gasses like oxygen, nitrogen, argon etc come in cylinders with pressures ranging between 200 to 300 bar.
So 100 bar would be an average pressure, i mean the average cylinder is half empty. Still if you would open a 300 bar gas cylinder 4000 m under the sea, it would get partially filled by water streaming inside..
As far as i remember a typical design pressure in hydraulic systems is 200 bar and now imagine a large industrial press with the dimensions of that sub. Many people in this world don't understand numbers without images.
Regards, Dieter
this forum is one of the worst, for people nit picking every perceived falsehood in someone's comments.
Yeah 3000 psi is pretty typical for hydraulics. they start getting expensive when you get beyond that.
When I get around to it, I have a 6" inside diameter steel pipe 5 feet long which should be good for 6000 psi tests if fully filled with water, its got .45" thick side wall.
A friend of mine just gave me a 3000 psi pressure washer so when I get around to it, I'm going to weld an end cap and threaded plug on the other end.
what a lot of the youtube videos don't capture properly is the intensity of the implosion, because they are using totally filled chambers. The energy displaced is limited to the energy stored in the pressure chamber's expansion under stress.. which ideally is zero.
if instead you fill the chamber with air to 1000 psi, then fill it with water to 3000 psi, you'll get a much more intense collapse.
i bought a block of acrylic i should be able to get a 1" diameter viewport out of.