It looks to me that this is just a standard AL 80.
IMO, It probably has the standard scuba thread (3/4" NPSM) just because it is a lot easier and less expensive to produce a valve that fit a standard scuba cylinder than it is to have a custom tank for a limited application.
Most of the industrial gas cylinders are steel, and AFAIK they all tend to use tapered neck threads.
Aluminum cylinders in the US are not allowed to use tapered neck threads so most of the ones that I have seen, AFAIK use either 3/4" NPSM or 1/2"NPSM.
Aluminum cylinders are used for portable O2 medical and for SCBA (fire fighting, mining, HAZMAT, etc.). I think those tend to use the 1/2"NPSM threads (similar to the old Sportsways or White Stag scuba valves), but I am not positive about all of them.
The new composite very high pressure (4500psi) SCBA cylinders probably use the 7/8”UNF neck threads to make sure they can’t use the older valves, but this is just a guess.
The 7/8” UNF thread is a relatively new neck thread that was introduced for very high pressure cylinders so that older valves cannot be installed in high pressure cylinders.
None of the pictures show the actual neck of the cylinder. Sometimes you can tell from the outside, by the size of the neck, what type of threads it probably has. There is no guaranties by just looking at the neck, but the sizes are so different that it is sometime obvious.
A picture of the neck may show if it is just a standard scuba AL 80 that was just re-purposed. Everything about it looks like it is.
BTW, that is a cool sticker. I wish scuba cylinders were provided with that much information.
IMO, It probably has the standard scuba thread (3/4" NPSM) just because it is a lot easier and less expensive to produce a valve that fit a standard scuba cylinder than it is to have a custom tank for a limited application.
Most of the industrial gas cylinders are steel, and AFAIK they all tend to use tapered neck threads.
Aluminum cylinders in the US are not allowed to use tapered neck threads so most of the ones that I have seen, AFAIK use either 3/4" NPSM or 1/2"NPSM.
Aluminum cylinders are used for portable O2 medical and for SCBA (fire fighting, mining, HAZMAT, etc.). I think those tend to use the 1/2"NPSM threads (similar to the old Sportsways or White Stag scuba valves), but I am not positive about all of them.
The new composite very high pressure (4500psi) SCBA cylinders probably use the 7/8”UNF neck threads to make sure they can’t use the older valves, but this is just a guess.
The 7/8” UNF thread is a relatively new neck thread that was introduced for very high pressure cylinders so that older valves cannot be installed in high pressure cylinders.
None of the pictures show the actual neck of the cylinder. Sometimes you can tell from the outside, by the size of the neck, what type of threads it probably has. There is no guaranties by just looking at the neck, but the sizes are so different that it is sometime obvious.
A picture of the neck may show if it is just a standard scuba AL 80 that was just re-purposed. Everything about it looks like it is.
BTW, that is a cool sticker. I wish scuba cylinders were provided with that much information.
