Oxygen compatibility, materials and explosions

[Celt]

No jumping to conclusions. You have stated that you pump 80% nitrox through an oil lubricated compressor designed for air. What authority recommends that this is a safe practice.

Well obviously no manufacturer is going to recommend that, but that doesn’t mean it can’t be done.

 

[Scuba J7]

Well you assume I’m going to hurt someone else and and I don’t believe in science both wrong.

Yes, troll away.
Your lack of comprehension is showing.

 

[Scuba J7]

Lets start with your temp measurement, on the exterior of your compressor stage! How does that relate to the internal temperature of that stage? How about the temperature of the gas being compressed by that stage? What is the flashpoint of your oil under hundreds of atmospheres of pressure in an O2 rich environment? Contaminates?

I'm not really interested in your "thoughts" on my questions, at this point it is becoming apparent that you are completely negligent or more than likely trolling. By the other posts on this thread, everyone seems to understand your incompetence in this matter so there really is no more point in addressing you.

Good Day

 

[2airishuman]

Hi Mac

I don't necessarily agree or disagree with anything posted upthread but do have a couple of thoughts to share and perhaps a couple of Facts you might wish to Consider as you pursue your project.

There are a great number of technical divers who have, and who do, compress oxygen so as to more readily facilitate its blending and dispensing. They are, I think, all aware of the hazards, and they all proceed with the belief that their systems are sufficiently free of contamination, and that the temperatures are sufficiently low, and the process slow enough that there is no meaningful hazard but rather only a residual risk that cannot be eliminated.

Yet the number of accidents is staggering. No centralized or complete records are kept, and it is unusual for the cases to be publicized. This makes it hard to arrive at any statistics. We have, only, anecdotal reports. The aluminum oxygen bottle that exploded in a dive shop due to a contaminated fill whip killing one, injuring others, and sending shrapnel across the street. The near miss with a highly regarded SB member who had CO contamination in an oxygen bottle due to a brief, undetected fire during the fill. Any number of divers who have had first stages burn during deco, at least one a fatality. The formerly active forum member who, years later, is still unable to dive due to life-changing injuries sustained when a contaminated aluminum oxygen cylinder caught fire in his car. The other similar incident that occurred while carrying a cylinder across a parking lot. The compressors that have exploded running 32% from a stick. The hydraulic boosters that burned even though they were boosting at just two or three strokes per minute. The commercially manufactured boosters that burned even though all components were intended for oxygen service.

There are many others.

Most of these accidents involved smart people, like you, who weighed the evidence and thought that they knew what they were doing.

On the whole, these accidents involved techniques widely considered safer than what you propose.

 

[Celt]

Hi Mac

I don't necessarily agree or disagree with anything posted upthread but do have a couple of thoughts to share and perhaps a couple of Facts you might wish to Consider as you pursue your project.

There are a great number of technical divers who have, and who do, compress oxygen so as to more readily facilitate its blending and dispensing. They are, I think, all aware of the hazards, and they all proceed with the belief that their systems are sufficiently free of contamination, and that the temperatures are sufficiently low, and the process slow enough that there is no meaningful hazard but rather only a residual risk that cannot be eliminated.

Yet the number of accidents is staggering. No centralized or complete records are kept, and it is unusual for the cases to be publicized. This makes it hard to arrive at any statistics. We have, only, anecdotal reports. The aluminum oxygen bottle that exploded in a dive shop due to a contaminated fill whip killing one, injuring others, and sending shrapnel across the street. The near miss with a highly regarded SB member who had CO contamination in an oxygen bottle due to a brief, undetected fire during the fill. Any number of divers who have had first stages burn during deco, at least one a fatality. The formerly active forum member who, years later, is still unable to dive due to life-changing injuries sustained when a contaminated aluminum oxygen cylinder caught fire in his car. The other similar incident that occurred while carrying a cylinder across a parking lot. The compressors that have exploded running 32% from a stick. The hydraulic boosters that burned even though they were boosting at just two or three strokes per minute. The commercially manufactured boosters that burned even though all components were intended for oxygen service.

There are many others.

Most of these accidents involved smart people, like you, who weighed the evidence and thought that they knew what they were doing.

On the whole, these accidents involved techniques widely considered safer than what you propose.

I’m not proposing it, I’m not telling anyone what to do, I simply said I have sent the remaining gas left in an oxygen j bottle, which I couldn’t decant, through my Bauer Utilus at 80% by pumping to 200bar in 20 minuets. Why people are jumping to the conclusion that I’m telling others to do it is beyond me

 

[grf88]

I believe members of the board were hoping to prevent you from having an accident but I would not be surprised that if at this pont, like me, they no longer care.

 

[Scuba J7]

I believe members of the board were hoping to prevent you from having an accident but I would not be surprised that if at this pont, like me, they no longer care.

Exactly, and not knowing the proximity of neighbors or family to prevent anyone else from being hurt. Cylinders can travel a long way with incredible force.

 

[Neilwood]

I believe members of the board were hoping to prevent you from having an accident but I would not be surprised that if at this pont, like me, they no longer care.

Exactly, and not knowing the proximity of neighbors or family to prevent anyone else from being hurt. Cylinders can travel a long way with incredible force.

Exactly this. We clearly can't stop Mac doing whatever the hell he likes but I only hope that he doesn't maim or kill anyone else.

 

[CT-Rich]

I’m not proposing it, I’m not telling anyone what to do, I simply said I have sent the remaining gas left in an oxygen j bottle, which I couldn’t decant, through my Bauer Utilus at 80% by pumping to 200bar in 20 minuets. Why people are jumping to the conclusion that I’m telling others to do it is beyond me

Just out of curiosity, how much money are you saving doing this? Twenty dollars a year? A thousand? Just hard to see the value considering the obvious risks.

 

[Celt]

Just out of curiosity, how much money are you saving doing this? Twenty dollars a year? A thousand? Just hard to see the value considering the obvious risks.

Very little saving in money, it’s more about seeing what can be done, if money was the only motivation very few would be diving. If I had a pound for all the times I was told I was going to drown myself when I started diving I’d be rich.