Glen, There is only one regulator I know of that will function maybe to this depth. Poseidon made a special regulator for regulator testing and it has been used for the very deep tech dives such as Sheck Exley made in South Africa and others on the WW I German battleships off of Virginia. The air in a cylinder that passes through a regulator at 60 bar is very “thick” (much higher density) and does not like to go through a typical regulator plus you have to worry more about icing of the regulator. I have experienced issues with the seating material and parts of the piston in a regulator when running them at pressures higher than they were intended for. You might consider using the Poseidon regulator (if it is still available, Poseidon in Sweden has went through some management changes since I last dealt with them) or adapt a regulator that is manufactured for these pressures to a scuba tank yoke. R/Jay Resepectfully, Jay K. Jeffries Andros Is., Bahamas Save the whales, collect the whole set. From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of glen brown Howsit Brent I like you pics you would do well in Africa.I am waiting for my Elliptical end for my hatch to be delivered in +- 2 weeks,but I have already finished making all the viewports I was hoping to release the hold down device at say 3meters below the surface on diving and pre resurfacing as part of a compulsory check list I plan on using a slotted hinge system which allows the hatch seal to mate flush with the hatch ring.Its a good idea to go lighter with the hatch its the last place one needs allot of unnecessary weight but as you can see I plan to use this weight to my advantage. James seems to be considering saddle mbt's(nemo style) I have already decided on going this way to minimize deck space and freedom of manipulator operation. I was thinking of fitting bilge pumps to get max floatation on surface the other thing is should I make the saddle mbt"s with fore and aft compartments to prevent airlocks.I am also trying to modify a scuba 1st stage regulator to deliver an higher pressure on its lp outlet to a max of 60bar to reduce my pressure on my air system because its easier and cheaper to get high quality fittings in lower pressures. Any thoughts will be appreatiated. All the best Glen SA |