Repurposing 55" tall gas cyclinder?

softdown

Last pressure test was 2009 - due for a pressure test. That is not the issue. The tank had helium and is still equipped to fill helium balloons - if it had pressure. Costs at least 125 for pressure test and helium.

i bought it thinking it would be good for surface scuba diving from a boat. Turns out that is not as easy as hoped. Each gas requires a different valve for one thing. may not be possible to get a 3000 psi scuba tank hydro test done - don't know.

looks like this tank; https://www.ebay.com/itm/Helium-tank-300-cf/254185368453?hash=item3b2ea0eb85:g:CMsAAOSwanhbkqWQ

mike95490

Don't do it.   Internal tank coatings can leach into high pressure air and do bad things to your lungs. Get a SCUBA tank

softdown

mike95490 said:

Don't do it.   Internal tank coatings can leach into high pressure air and do bad things to your lungs. Get a SCUBA tank.


Thanks for the heads up. Got a dozen scuba tanks. They run out of air while I'm getting started. Endurance is decent here - though I have not dived in awhile. The thought of a monster tank strapped to my 

BB.

What about a surface air compressor for tethered diving ("hookah system"?):

https://www.scuba.com/scuba-gear/Hookah-Systems.html

Of course, there are lots of options (even battery powered?) and issues (air intake vs engine exhaust, certifications that may be required for operator, etc.)--But diving with a line back to the surface vs hauling a big old air tank...

-Bill

softdown

BB. said:

What about a surface air compressor for tethered diving ("hookah system"?):

https://www.scuba.com/scuba-gear/Hookah-Systems.html

Of course, there are lots of options (even battery powered?) and issues (air intake vs engine exhaust, certifications that may be required for operator, etc.)--But diving with a line back to the surface vs hauling a big old air tank...

-Bill

Hookah's are logical for surface diving. I got this tank in good condition for $35 and couldn't resist. Still not over. At the worst I can make a LOT of helium balloons if I invest another ~$135 or so. 

What can I do with helium balloons? Now that is a good question. There sure were fun when I was young. 

littleharbor2

softdown said:

BB. said:

What about a surface air compressor for tethered diving ("hookah system"?):

https://www.scuba.com/scuba-gear/Hookah-Systems.html

Of course, there are lots of options (even battery powered?) and issues (air intake vs engine exhaust, certifications that may be required for operator, etc.)--But diving with a line back to the surface vs hauling a big old air tank...

-Bill

Hookah's are logical for surface diving. I got this tank in good condition for $35 and couldn't resist. Still not over. At the worst I can make a LOT of helium balloons if I invest another ~$135 or so. 

What can I do with helium balloons? Now that is a good question. There sure were fun when I was young. 

Got a lawn chair and a bb gun?  

Estragon

IIRC, there have been periodic shortages of helium recently, so the bb gun might be a pretty expensive way to pass time!

billybob9

I've been diving for awhile and got my Diving Certificate in Hawaii. The course was pretty hard compared to the ones in Honolulu but I wanted to be in that club. To get your tanks charged in Hawaii you needed a certificate and dated test on the tank. Most of the training was done off Ewa Beach where diving was pretty good at the reef. We always had to write a report with hours of diving and depth from the dive chart. multiple dives during a day could possibly get you a trip to the decompression chamber if you weren't careful. Nitrogen build up in your blood. Bahia diving is Ok and mostly shallow. The locals still use the old fashion one man in the boat hand cranking the compressor and the diver with the hose. Never dive alone is the key to staying alive in any situation.