While it's true that scuba tanks are only required to be visually inspected at time of hydro,
I can't imagine wanting to take on the liablity of filling a tank that has not been VIP'd yearly.
If you've never seen a tank fail, I can assue you it is not a pretty thing to be around.
Believe me scuba shops don't get rich on visually inspecting a tank. (assuming they are done properly). Most of the shops I've been in over the last 35 years charge a token fee. In addition to visually inpecting the tank for pits and corrosion, most shops now eddy current test the neck threads for micro stress cracks that can cause the tank to fail. The yearly inspection is highly recommended by the tank manufactuers, and has been shown to have reduced the number of accidents caused by failed tanks. There is also the probability that insurance premiums and liability play a big factor too. If there is an accident attributed to scuba equipment usage, the first thing that is confiscated and checked is the equipment. Being that yearly inspections are the norm, heaven help the guy who has to justify filling an uninspected tank to the victims family.
Granted the tank in question is supposed to be for "air gun use only", there is no guarranty that it's not loaned out to someone for diving, or other breathing air purpose.
I can't imagine any repuatable shop owner risking his career on a strangers/friend's promise of the tanks intended purpose.
PLEASE...don't take for granted that that 3000 PSI bomb you carry in your car is safe.
Spend the money to insure your safety.
I use a scuba tank to fill my 2000 psi Disco and soon to be HPA 850 because I have tanks and dive, so no investment there. I get 80 practical fills out of it, and where I shoot, the is not a refill station around for miles, so it's a double benefit for me.
If you only shoot a little, can get away with 7-8 fills per tank, and have refill access, then the smaller purpose made tanks are the way to go.
A scuba tank refill is $5, how much is a CF tank fill? If you had to fill it 10 times, would it cover the visual inspection fee?
Don't get me wrong, I'm not flaming, just making a point about safety and curious about how much it costs to fill the smaller tanks.
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