How'd you make a have out of a have not?

[elmagnoon]

I don't understand the Nitrogen Separating Membrane of getting nitrox!

There's 21 percent Oxygen in air. How does removing nitrogen from Air create more Oxygen?

We have a truck full of gravel mixed with sand, 21 percent gravel. Thought the percentage of Gravel to sand increases by removing some of the sand, the amount of gravel does not change!

 

[elmagnoon]

Sorry, the light bulb just went on. I guess I just wasn't thinking :11doh:

 

[cdennyb]

Isn't the thought process wonderful? Now picture thinking that at 100'...priceless.

 

[Scuba Duck]

Nitrogen membranes were initially developed by the welding industy to concentrate nitrogen from air. It turns out that when you concentrate the nitrogen, you also concentrate the oxygen, which is of use to the diving community. In the middle of the membrane is a series of tubes, like drinking straws, that run the length of the membrane. The membrane tubes are semi permiable and oxygen migrates through the walls of the tube faster than Nitrogen. There are two ouput paths from the membrane, the nitrogen vent and the permeate, or enriched oxygen mixture.

Here is a link to the Medal site, these are the membranes used on the many of the systems out there.

http://www.medal.airliquide.com/en/membranes/nitrogen/index.asp

Let say that 30 cfm of air goes into the membrane, this equates to 6.3 cfm of oxygen and 23.7 of nitrogen. The membrane enriches the permeate to 32% at 15 cfm to feed to your HP compressor. This permeate contains 4.8 cfm of oxygen and 10.2 CFM of nitrogen. The stuff at the nitrogen vent would be the ballance of the gases or 1.5 cfm of Oxygen and 13.5 of nitrogen. 30 cfm of gas goes in, 30 cfm of gas comes out. The membrane simply concentrates more of the oxygen in one area.

 

[Mako Mark]

9.36 am, post silly question,
9.44 am, lightbulb goes on fueled by first cup of coffee.



Priceless..