Question about oxygen cylinders

[Jondjames]

Strange question maybe? Sorry but I'm still new. With that said I was just sitting here wondering if a portable oxygen tank like one carried by people with respiratory problems can be used for scuba diving? Understanding that they are generally much smaller than the standard tank, I was thinking maybe like for a pony bottle or something

 

[tbone1004]

it's possible, but adapting regulators for it is quite difficult. Medical O2 regulators aren't up to the flow rates required for scuba diving. They're also really low pressure by diving standards since they are intended for O2 use, so your weight:gas ratio is really wonky

 

[Jondjames]

Thank you kindly. I google searched it before I asked here and couldn't seem to find any info. This answers my question! Thanks again

 

[captain]

You could but you would have to replace the valve. I have a medical size E oxygen tank I put a scuba valve on.

 

[joe10540]

You wouldn't want to use 100% O2 as a pony bottle but they do make scuba cylinders as small as 3cf I think. For a pony you probably want at least a 19cf if not a 40cf and then when you are ready to use 100% for deco you can have them O2 cleaned and use them. Not to mention if you watch the classifieds you can find them used usually for about half of what they'd cost new.