DIY EAN Membrane build

[grantmac]

Running a stick has other challenges though in terms of compressor maintenance and potential issues if a control fails though from what I can tell. At least from what I can see.

Then again I've only got a little 5cfm pump which I run with no automation so perhaps a stick wouldn't be difficult to manage. 20l/min of O2 should do it if I'm calculating correctly.

 

[Wookie]

probably should have clarified with "mainland" vs. land based, Keys are a bit annoying and expensive to get industrial gas cylinders delivered, but I have legit not seen one in probably 15 years outside of an island or boat installation. PP blending is dumb, agreed.

A liquid dewar with pressure building regulator would be perfectly satisfactory for almost any large scale operation.

I have a membrane laying around if someone needs it. It’s a UBS, probably sufficient for a Utilis or 5405. Not nearly large enough to meet the OPs needs

 

[rjack321]

PS. A nitrox membrane from a scuba supplier will cost north of $10K

A nitrogen membrane will cost about $2k

They are identical.

As you know, there's much more than $2k for the membrane

but I have never actually seen a membrane system in operation in a land-based US dive shop, and it's because they don't make any sense.

There was a leased membrane system in a local Seattle shop called Starfish back in the 2005-2008 era. They went bankrupt trying to make the payments on their vastly excessive LP pump, LP storage, gas heater, filtration, and membrane. Dive shops are already a fabulous way to lose money, membrane systems just accelerate that decline.