Bicycle pump air tanks.

[Fishdip]

It takes an absurd amount of effort to pump these up by hand, and then they last for at most a couple minutes. I think many are 1.5 to 3 cubic feet. For reference, I believe I use about 100psi per breath on a 6cu at 8ft deep. On a 3cu, that would be 200psi. So, if you mange to get the bottle to 3000 psi, you've got 15 breaths or less.

I dove with a 3cu spare air at shallow depths once, and that was SUPER sketchy and was out of air WAY faster than I expected. A 6cu is probably the minimum size I'd say is any "fun" to use. Any smaller, it's barely any advantage over free-diving.

Will we see injuries? Maybe. It takes so much effort to pump up that people are unlikely to use one more than a couple times, before giving up.

They have to be bigger then this! I posted a video in this and its one of many showing the ppl getting 10min+. Yes I know some are fake marketing scams but like the one I posted that gives it a bad rating Id have to think its real?

 

[Fishdip]

Realizing now that this thread was a troll, still, as a caution, I own both the bicycle high pressure pump and one of the electric pumps. They work quite well but are intended for PCP air rifles and that is my use when I cannot get a fill for my SCBA 4,500 psi tank. But it is highly likely they produce CO as they are not intended for breathing air and a PCP air rifle does not suffer from CO poisoning.

Inside of PCP rifle:



Moisture is the enemy of these rifles and moisture filters/traps are in place but the lubricants and precautions for CO, not so sure.

N

Not trolling at all. Also very good points about the CO!

 

[Fishdip]

Interesting part is for in a helicopter we have them as a last ditch effort if you ended up under the water (the version is called a HEED3) and to get ours refilled at a shop I had to go to multiple shops as they refused to even fill it due to people using the tanks for diving and died apparently..

Did they require proof of use?

 

[Gone for diving]

Smarter way to get around it is get a 3500 psi tank and get it filled a a fire station.
Then you could refill your small bottle,
And top if off if wanted with a pump as the pressure drops....
But most people will not bother, it's to much work and fooling around, and why not use the big tank then..

Have always thought those kits modified... you could make a quick simple oxygen rebreather....... but you could probably kill yourself easier that way

 

[Fishdip]

Smarter way to get around it is get a 3500 psi tank and get it filled a a fire station.
Then you could refill your small bottle,
And top if off if wanted with a pump as the pressure drops....
But most people will not bother, it's to much work and fooling around, and why not use the big tank then..

Have always thought those kits modified... you could make a quick simple oxygen rebreather....... but you could probably kill yourself easier that way

Had no idea fire stations would do that!

 

[Boarderguy]

Had no idea fire stations would do that!

Not all will. In fact most won't. My local station has a dive team and would up until about 10 years ago. Now they tell everybody no because of all the sue happy Nancy's of the world. The liability isn't worth the risk. They're not even allowed to fill their own personal tanks anymore because of whiney little creatures that couldn't get their way.

 

[SlugLife]

They have to be bigger then this! I posted a video in this and its one of many showing the ppl getting 10min+. Yes I know some are fake marketing scams but like the one I posted that gives it a bad rating Id have to think its real?

Did they actually time (not estimate) the use, is the person reputable, what size, what depth, and are they swimming or just sitting there?

Depending on a variety of factors, you might be able to squeeze 10+ minutes out of a pump up tank, but probably not 10+ minutes of real use, and you'd probably be looking at a 6cu or larger tank. Not impossible, but then we're also dealing with even MORE manual pumping.

I'm not going to argue, but I am telling you what my experience is with small SCUBA cylinders, which I own, and have used all of 19cu, 6cu, 3cu, and 1.7cu. Even on my 19cu, air use is surprisingly fast. I didn't time the dive, but we needed someone to secure an anchor because we couldn't hook anything and were drifting fast due to wind. After a very short dive at 30ft, I managed to use about 1000psi.

If you really want a small tank, I need to get around to selling a 1.7cu and 3cu spare air, and then a 6cu bottle with pony regs. I believe all are out of hydro, but I always transfill them from a scuba-tank. I think the adapter is about $40. Or you could always use one of those pumps.

edit: It appears you are a relatively new diver, which isn't a criticism (we all were there). You can see I actually own some of these mini scuba-tanks. I initially bought the 1.7cu and 3cu as "emergency-devices." After a quick, shallow test-dive on the 1.7 and 3cu at shallow depths, I quickly discovered they're FAR too small to make good emergency-redundant-tanks. The basic experience is tanking a few breaths and then "oh crap, I'm out already?!"

The 6cu, I bought later because I happened across an amazing deal, and they're ok for travel emergency-devices ... if you skip the safety stop and stay above about 90ft. Normally speaking I prefer 19cu (as a backup) at recreational depths. For the 1.7cu or 3cu, if you had to switch over for any reason, you should probably start an immediate emergency-ascent as if you didn't even have the bottle, and will probably run out on the way up.

 

[Dormant]

If it looks too good to be true....

 

[Boarderguy]

I get 15 minutes of swimming with my 13 cu pony at 10-15 ft. I'm not an air hog. No chance any non fish person could do 10 minutes on a 3 cu.

 

[Fishdip]

Did they actually time (not estimate) the use, is the person reputable, what size, what depth, and are they swimming or just sitting there?

Depending on a variety of factors, you might be able to squeeze 10+ minutes out of a pump up tank, but probably not 10+ minutes of real use, and you'd probably be looking at a 6cu or larger tank. Not impossible, but then we're also dealing with even MORE manual pumping.

I'm not going to argue, but I am telling you what my experience is with small SCUBA cylinders, which I own, and have used all of 19cu, 6cu, 3cu, and 1.7cu. Even on my 19cu, air use is surprisingly fast. I didn't time the dive, but we needed someone to secure an anchor because we couldn't hook anything and were drifting fast due to wind. After a very short dive at 30ft, I managed to use about 1000psi.

If you really want a small tank, I need to get around to selling a 1.7cu and 3cu spare air, and then a 6cu bottle with pony regs. I believe all are out of hydro, but I always transfill them from a scuba-tank. I think the adapter is about $40. Or you could always use one of those pumps.

edit: It appears you are a relatively new diver, which isn't a criticism (we all were there). You can see I actually own some of these mini scuba-tanks. I initially bought the 1.7cu and 3cu as "emergency-devices." After a quick, shallow test-dive on the 1.7 and 3cu at shallow depths, I quickly discovered they're FAR too small to make good emergency-redundant-tanks. The basic experience is tanking a few breaths and then "oh crap, I'm out already?!"

The 6cu, I bought later because I happened across an amazing deal, and they're ok for travel emergency-devices ... if you skip the safety stop and stay above about 90ft. Normally speaking I prefer 19cu (as a backup) at recreational depths. For the 1.7cu or 3cu, if you had to switch over for any reason, you should probably start an immediate emergency-ascent as if you didn't even have the bottle, and will probably run out on the way up.

Dont get me wrong I am not saying you have no idea what you are talking about. All I am saying is the tanks had to be bigger then what you where talking about because the dives where “actual time”. 100% not looking for something like this for my own use i have a actual pony for a back up air since I dive alone often. As far as still a new diver I will give you that as I only have 250-300 dives. The point of this thread was just to see if the influx of self pump tanks would increase the amount of scuba accidents.