Nitrox Fills

plsdiver4377 · May 6, 2003

Just wondering what type of Nitrox fill system is the most prominent. Partial Pressure or Membrane. Also where are the shops located.

I hope this is the correct forum, also if it has already been done my apologies.

Thanks, Jim

Rick Murchison · May 6, 2003

Most folks around here use neither - they premix upstream of the compressor. Commonly called "continuous blending."
Rick

Big-t-2538 · May 6, 2003

Like rick said...we need a third option....the shop I was taught at in IN, did continuous blending...the only shop in dayton is a membrane shop

Diversauras · May 6, 2003

I learned Nitrox and got my first fills from Olympus who has a membrane system. My first pp experience was on the Okeanos Aggressor. I found / find it odd that every tank gets blown down after every dive and that with the O2 being added from a multi valve whip the gas was still +-5% from what was planned. Give me a membrane anytime...

padiscubapro · May 6, 2003

Diversauras once bubbled...
I learned Nitrox and got my first fills from Olympus who has a membrane system. My first pp experience was on the Okeanos Aggressor. I found / find it odd that every tank gets blown down after every dive and that with the O2 being added from a multi valve whip the gas was still +-5% from what was planned. Give me a membrane anytime...

Sounds like the guy needs a lesson in blending or better pressure guages, even reblending tanks I expect no worse than +/- 0.5%
Even doing trimix my oxygen and He is right on..

My problem with membrane systems the Co/Co2 content is usually too high for me.

Scubaroo · May 6, 2003

poll option added

gentlegiant · May 6, 2003

I personally like having the fills partial pressure mixed when they are done in a dive shop where they have time to do the job right. That way you can get custom mixes if you want them. I know that you can also do this with continuous blending and that is fine by me also.

I think that dive operators and live aboards who have to fill a large amount of tanks in a short period of time should use membrane systems since that takes the calculations out of the equation and makes life much simpler for them. In my mind it is also much safer than having large O2 tanks on the boat and it frees up some space.

plsdiver4377 · May 6, 2003

Thanks for adding the other option Scubaroo. I didn't know about that one, still new at this.

I have 4 shops in the area and 3 use PP and the other (primary LDS) uses the membrane system, and the tanks requirements are different for each apparently. :wacko:

Jim

pufferfish · May 6, 2003

padiscubapro once bubbled...

My problem with membrane systems the Co/Co2 content is usually too high for me.

Where does the CO/CO2 come from?

Doof · May 6, 2003

I've never heard of Membrane. How is this done?

Nitrox Fills

What type of Nitrox fill system does your LDS use?

Partial Pressure

Membrane

Continuous Blending

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