If a tank is going to have less than 40% o2 there is really nothing that needs to be done.

If you plan on putting more than 40% 02 I would take the valve off and apart, soak it in simple green and replace the o-rings with vinton and use 02 acceptable grease.

I have two ponies that hold pure 02 which I also scrubbed out the inside with simple green, rinsed and dried. 

Next time your driving down the road take a look at a welders o2 setup.  Not quite immaculately clean and he is putting flame to it!

Holy Sh** this is what the dive pros charge

Cylinder & Valve Oxygen Cleaning (does not include parts)

$60.00

"Mors Ab Alto" (Death From Above)

http://blmoore.com/

At MBT, we require all NITROX tanks to be O2 cleaned because we "partial pressure" fill - meaning, we start with 100% O2 in the tank and then "dilute" it with air.  Every mix is a essentially a custom mix.  We charge $35 for the cleaning, VIP, and Fill with up to 40% - including parts. 

Shops that bank premixed nitrox don't need to worry as much about O2 cleaning because the tank isn't exposed to O2 above 40% (although some of these shops will still require the cleaning).

Once a tank is O2 cleaned, it doesn't have to be re-cleaned unless it has gotten contaminated.  You can still use the tank for air as long as you get the fill from a clean compressor and fill station.

More on this later.

"Mors Ab Alto" (Death From Above)

http://blmoore.com/

Not sticking your toung in a light socket is probably a good idea too! Just kidding buddy.

If I'm not mistaken, most shops use the partial fill method, where you are getting 100% pure O2 pumped in! And I don't think any shop will fill without that punched sticker. $35 is a great price, since that includes you VIP too!

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