PLAGUE Posted January 24, 2010 Report Share Posted January 24, 2010 Can you fill a pcp with pure oxygen or must it be breathing air. If only air - why so?. Thanks for any replies. Steve. Quote Link to comment Share on other sites More sharing options...
UKPoacher Posted January 24, 2010 Report Share Posted January 24, 2010 Leave your Granny's oxygen supply alone! Quote Link to comment Share on other sites More sharing options...
Paddy Galore! Posted January 24, 2010 Report Share Posted January 24, 2010 (edited) PURE oxygen is corrosive and explosive under pressure do not use under any circumstances. Edited January 24, 2010 by GRAM71 Quote Link to comment Share on other sites More sharing options...
PLAGUE Posted January 24, 2010 Author Report Share Posted January 24, 2010 (edited) Thank's GRAM. Understood. Edited January 24, 2010 by PLAGUE Quote Link to comment Share on other sites More sharing options...
Paddy Galore! Posted January 24, 2010 Report Share Posted January 24, 2010 i've known people to use nitrogen tho, inert gas, used in racing tyres as it remains stable under pressure and temperature changes. Also helium works. A noble gas.. Quote Link to comment Share on other sites More sharing options...
Dougy Posted January 24, 2010 Report Share Posted January 24, 2010 (edited) USE IT AT YOUR PERIL pure oxygen is highly explosive. I dont know how old you are i havn't really bothered to look at your details, Didnt you learn anything at school. Play about with pure oxygen in pressurised cylinders and it could end up at least blowing off one of your limbs, or you could end up nailed up in a coffin. it HAS happend to people dont use anything other than breathing air whatever you hear. Edited January 24, 2010 by Dougy Quote Link to comment Share on other sites More sharing options...
grantellissheffield Posted January 24, 2010 Report Share Posted January 24, 2010 i use helium in my pcp i makes it alot lighter aswel Quote Link to comment Share on other sites More sharing options...
Dougy Posted January 24, 2010 Report Share Posted January 24, 2010 oxygen not sure if this will work but i think it may be worth a read Quote Link to comment Share on other sites More sharing options...
stevethevanman Posted January 24, 2010 Report Share Posted January 24, 2010 If you need to dispatch it quickly i would of put in front of the front wheel and just drove over its head before anyone else was on the scene it would of shorten its suffering job done ..... PURE oxygen is corrosive and explosive under pressure do not use under any circumstances. I think for it to be explosive you need a fuel..we used to play about with pure oxygen in the labs The main danger is it damaging the metal of the pressure chamber, and then exploding but not due to an ignition. Steve Quote Link to comment Share on other sites More sharing options...
webber Posted January 24, 2010 Report Share Posted January 24, 2010 Under NO circumstances should you fill a PCP with OXYGEN. Contrary to previous replies, OXYGEN is neither corrosive nor explosive; but may cause your rifle to explode due to dieseling effect when the lube oil encounters an enriched OXYGEN atmosphere. Just to recap, thats NO, NEVER, NO HOW! Thats webber with his Technical Directors hat on. Quote Link to comment Share on other sites More sharing options...
gsm1968 Posted January 24, 2010 Report Share Posted January 24, 2010 Webber has it spot on! All oxygen equipment is marked "use no oil" for this exact reason. Quote Link to comment Share on other sites More sharing options...
chewy0013 Posted January 24, 2010 Report Share Posted January 24, 2010 Along the same sort of lines would nitrogen work better than air in a pcp, its more stable, would prevent dieseling, and has the potential to be more consistant. I have my tyres fitted at costco and they fill them with nitrogen, in 7 months the pressure has gone down by only 2 psi, so nitrogen has to be good! On the other hand pcp are designed with the use of air, so not sure?! Quote Link to comment Share on other sites More sharing options...
stevethevanman Posted January 24, 2010 Report Share Posted January 24, 2010 Isnt dieseling just pressure action?, I think a pure oxygen enviroment will have a differance on how it interacts with ferrous metals. Steve Quote Link to comment Share on other sites More sharing options...
webber Posted January 24, 2010 Report Share Posted January 24, 2010 Along the same sort of lines would nitrogen work better than air in a pcp, its more stable, would prevent dieseling, and has the potential to be more consistant. I have my tyres fitted at costco and they fill them with nitrogen, in 7 months the pressure has gone down by only 2 psi, so nitrogen has to be good!On the other hand pcp are designed with the use of air, so not sure?! NITROGEN is perfect, clean and dry, better than air, more expensive, but still affordable. webber Quote Link to comment Share on other sites More sharing options...
webber Posted January 24, 2010 Report Share Posted January 24, 2010 Isnt dieseling just pressure action?, I think a pure oxygen enviroment will have a differance on how it interacts with ferrous metals. Steve NO webber Quote Link to comment Share on other sites More sharing options...
Paddy Galore! Posted January 24, 2010 Report Share Posted January 24, 2010 oxygen under pressure is corrosive, its an oxidizing agent in it .. Quote Link to comment Share on other sites More sharing options...
webber Posted January 24, 2010 Report Share Posted January 24, 2010 Oxygen is an oxydising agent, not quite the same as corrosive in my book. webber Quote Link to comment Share on other sites More sharing options...
Paddy Galore! Posted January 24, 2010 Report Share Posted January 24, 2010 ok point taken, i'll have a chat with my old dive instructor about that "corrosive" quality of oxy under about 250 bar of pressure tho, The main point tho is this, when the air chamber of the gun is empty, it can draw air from the atmosphere, this air naturally contains some moisture, with the concentration of O2 being so rich it will "OXIDIZE" everything it comes into contact with and "ACTS" like a "CORROSIVE" material. there, anal enough for you? Quote Link to comment Share on other sites More sharing options...
webber Posted January 24, 2010 Report Share Posted January 24, 2010 ok point taken, i'll have a chat with my old dive instructor about that "corrosive" quality of oxy under about 250 bar of pressure tho,The main point tho is this, when the air chamber of the gun is empty, it can draw air from the atmosphere, this air naturally contains some moisture, with the concentration of O2 being so rich it will "OXIDIZE" everything it comes into contact with and "ACTS" like a "CORROSIVE" material. there, anal enough for you? GRAM71 I have been polite with you despite your inaccurate statements, although well ment, and really don't appreciate your anal remark. By all means have a word with your old dive instructor; but please be aware that I am employed as Technical Director of a compressed cylinder gas company and would advise you that standard grade O2 cylinders receive no special internal corrosion prevention treatment. Regards webber Quote Link to comment Share on other sites More sharing options...
Paddy Galore! Posted January 24, 2010 Report Share Posted January 24, 2010 GRAM71 I have been polite with you despite your inaccurate statements, although well ment, and really don't appreciate your anal remark. By all means have a word with your old dive instructor; but please be aware that I am employed as Technical Director of a compressed cylinder gas company and would advise you that standard grade O2 cylinders receive no special internal corrosion prevention treatment. Regards webber Webber, i apologise now for any offence you may have taken but, although you may not have been rude you were however dimissive and abrupt. may i ask what procedures you take to inhibit moisture from your O2 bottles? Iam genuinely interested as it's been my[mis]informed opinion that O2 + moisture = corrosion. I would imagine my diving instructor was meaning this scenario, i know that when recharging bottles from his pump he always tells people not to fully discharge them or they become contaminated with moisture filled air. Quote Link to comment Share on other sites More sharing options...
SSS Posted January 24, 2010 Report Share Posted January 24, 2010 You have already been told but I think it is worth repeating, DO NOT USE OXYGEN, UNDER ANY CIRCUMSTANCE! Inert gases can be used, but can be a pain to find adaptors for the bottles, nitrogen is supposed to be good, personally, I always used to use good old breathing air, easier to get hold of and cheaper. Good luck Quote Link to comment Share on other sites More sharing options...
SSS Posted January 24, 2010 Report Share Posted January 24, 2010 Oxygen is an oxydising agent, not quite the same as corrosive in my book. webber Sorry webber, but I always thought corrosion, or more commonly rust, is oxydation. Oxydising agents, or oxygen, cause oxydation. Feel free to correct me if I am wrong, I might be misunderstanding . Quote Link to comment Share on other sites More sharing options...
webber Posted January 24, 2010 Report Share Posted January 24, 2010 Webber, i apologise now for any offence you may have taken but, although you may not have been rude you were however dimissive and abrupt. may i ask what procedures you take to inhibit moisture from your O2 bottles? Iam genuinely interested as it's been my[mis]informed opinion that O2 + moisture = corrosion. I would imagine my diving instructor was meaning this scenario, i know that when recharging bottles from his pump he always tells people not to fully discharge them or they become contaminated with moisture filled air. GRAM71 The origin of this post was regarding filling a PCP with OXYGEN. The primary reason for NOT filling a PCP with O2 is the high risk of explosion caused by the dieseling effect when lube oil comes into contact with an oxygen rich atmosphere. Even today filling plant opperatives lose fingers, parts of hands and even life when filling O2 cylinders which have not been correctly cleaned prior to filling. Its a real danger, not a myth. Your are partially correct O2 + moisture + Fe (Iron) will result over time in corrosion. Rust is Ironoxide. Thats why its better to utilise NITROGEN in a PCP as it is clean and dry. Compressed air as you will know contains water vapor, if the water was dryed out divers would get a sore throat and possibly other complications, but I am not a diving gases specialist. My specialisation is in LPG and Beverage Dispense gases CO2 etc. Oxygen and the vast majority of other HP cylinders today utilise RPVs, Residual Pressure Valves. These valves do what your dive instructor advised, ie,they maintain a residual pressure balance around 2 Bar thus preventing the ingress of atmospheric gases and contamination. Its not unusual for cylinders to be subjected to high vacuum immediatley prior to filling. webber Quote Link to comment Share on other sites More sharing options...
Paddy Galore! Posted January 24, 2010 Report Share Posted January 24, 2010 Webber, you are correct, i am not disputing your knowledge. however i was only trying to divulge some useful info regarding the oxidizing qualities of O2. O2 itself isn't corrosive as you say, but when added to a medium like moisture vapour it will significantly increase the oxidization process, in a pcp rifle any moisture present in the pipes used to fill the rifle will mix with the O2, directly attacking the integrity of the container, in a worst case scenario the cylinder can rupture and [depending if the cylinder is full] serious injury can occur. I cannot say that i have seen this happen, but i have seen injuries caused by high pressure leaks and they are pretty nasty inc loss of fingers, eyes, skin. regards, gram.. Quote Link to comment Share on other sites More sharing options...
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