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Re: Isolation manifolds & modern DH extended range diving

Posted: Fri Apr 26, 2019 10:26 pm
by luis
mdw wrote:
Fri Apr 26, 2019 3:49 pm

Do what you want, and I will too, but I'll continue to report the results of my experiments here in case anybody else wants to consider these options for their own use.
Thanks

It is good to see different Modern Era DH options.

Re: Isolation manifolds & modern DH extended range diving

Posted: Tue May 28, 2019 5:54 am
by Bronze06
I am with mdw to wit Mark on this one. Good Call Mark! Just saying. For further guidance see photo below....lol.

Re: Isolation manifolds & modern DH extended range diving

Posted: Tue May 28, 2019 5:58 am
by Bronze06
Wow! A plethora of "White Paper analysis with only one fricken photo of an old Scubapro SEMI- isolation/Downstream type manifold!!!!

Here's a good Wikipedia definition for us laymen. and some nice pictures to go with it.

"A scuba manifold is used to connect two diving cylinders containing breathing gas, providing a greater amount of gas for longer dive times or deeper dives. An isolation manifold allows the connection between the cylinders to be closed in the case of a leak from one of the cylinders or its valve or regulator, conserving the gas in the other cylinder. Diving with two or more cylinders is often associated with technical diving.

Several configurations are used, each with its own range of applications, advantages, and disadvantages."

Using the above definition, the following manifold IS NOT and Isolation manifold, just a direct dual tank manifold.
Vintage Dual tank single valve manifold with reserve valve..jpg

Below is a true isolation valve in the modern sense. in that can cut off flow to either a given piece of equipment or from a cylinder while still allowing the rest of the unit/units to function to wit; allow the diver to breathe....lol.
31Fk1kWf+QL._SX425_.jpg

And here is a fun chart. Which do you think kids are isolation and which are "just manifolds", let's see some hands?
Scuba_Manifolds_Schematic.jpg
I use an older Sherwood that I would call a semi-isolation manifold, due to its having only two valves and is incapable of completely isolating one tank from two fail point areas. Isolation in my mind means just that, the ability to completely isolate a component.