diy doubles question

[Rick Murchison]

It's pretty common practice for commercial operations, such as dive shops, to use continuous mixing or membrane systems. It allows the dive shops to mix gases safer and faster. (And in all reality a monkey could use a continuous mixing or membrane system. It's about as easy as filling a tank with air. No fancy math algorithms to figure out how much o2 to put in a tank, etc)

Hmmm... interesting perception. You may be surprised to find there are many parts of the world (and parts of the States) where PP blending is the norm. I certainly was when I started asking around.
Oxygen cleaning isn't rocket science, but if the shop is using PP blending it is necessary. As for cost, how much is your time worth? Oxygen cleaning a couple of 133's and their valves - especially if you've never done it before - could take you a couple of hours or more, to say nothing of flash rust management. At $100 I'd do it myself... at $50 I'd pay someone else to do it.
Rick

 

[Rick Murchison]

valves and manafold and are said to be O2 clean already. Can I trust this claim ... ?

I don't know... can you? Ever seen an oxygen fire?
Let's put it this way... if I were the guy filling these tanks using PP blending, I would want to receive them in the box and inspect them myself and/or (depending on the result of my inspection) have them and their valves go through an O2 cleaning either by me or under my supervision before filling them. Call me anal, call me overcautious, call me a witness to a guy without a face. Messing with pure oxygen ain't tiddly-winks.
Once I get to know you and to know that you're just as trustworthy as I am about oxygen cleanliness then I'll be happy to PP fill your tanks any time - but until then I'm going to make sure that I know they're clean and have been kept clean.
Rick

 

[Rick Murchison]

buy some silicone greese (sic) and do it yourself.

Silicone grease is not oxygen compatible. Just thought you'd like to know.
Rick

 

[billtylerjr]

Yea, is the deal still available? The TDL deal is $366 shipped, so closer to $700. If I could get for $500, I'm there...

Chris

I was walking by and had a hand written paper taped to the tank sunday afternoon, i guess it was a last minute thing. Perhaps if you call then and ask they would still honor it??

 

[billtylerjr]

I don't know... can you?

Ok, I can see your point and agree! I do not have the experiance to do it myself and as such it seems to make since to let the shop do it. I wonder if they will allow me to do it with them? Would you (not just you Rick but anyone) reccomend to someone to take the few hours to learn to clean it your self or is there a "course" (not looking for a card just responsible instruction) I would take to learn?

 

[Rick Murchison]

Ok, I can see your point and agree! I do not have the experiance to do it myself and as such it seems to make since to let the shop do it. I wonder if they will allow me to do it with them? Would you (not just you Rick but anyone) reccomend to someone to take the few hours to learn to clean it your self or is there a "course" (not looking for a card just responsible instruction) I would take to learn?

Get yourself a copy of the Oxygen Hacker's Companion - like I say, it ain't rocket science, but it is necessary. So it's worth doing right.
Rick

 

[billtylerjr]

Get yourself a copy of the Oxygen Hacker's Companion - like I say, it ain't rocket science, but it is necessary. So it's worth doing right.
Rick

Cool, its on its way thanks for the suggestion

 

[billtylerjr]

Holy crap these are big! I dont recall them being this big at the show.

 

[amascuba]

Silicone grease is not oxygen compatible. Just thought you'd like to know.
Rick

I know this, but for recreational mixes of Nitrox christolube isn't needed, but like you said in a earlier post - If the shop is doing partial pressure blending then o2 cleaning and christolube is nessessary.

 

[super opus]

most shops are getting 86 the pp for the fact that a lot of people are diving nitrox ask your local shop find out what they use and hell I want to get 2 tanks for 500 point me the right way too