Help with USN Divers Tank Id (with Pictures)

[bambam634]

Hello, I am new to the forum and the reason i am here is I was given an old (What I thought to be a welding gas cylinder) but after looking into and researching it appears to be a USN scuba tank... Any info on this tank would be absolutly amazing.
the info stamped on the tank is
One Side
ICC-4B500
N-118960
PST
6-45 PST TW 34 1/2
The Other Side
U FN U
S F-40739S
N N

 

[Johnoly]

...........ICC-4B500...........

I know alot of the old 4B tanks were rated at 300psi and used mostly for Acetylene.

That 4B tank is rated at 500 psi which is too low for oxygen but too high for Acetylene and completely worthless for scuba
Could be for argon but I don't know if the USN was using that back then.

 

[bambam634]

Well thats a start at least. I seen so many post about the USN being a navy dive tank i never even thought it might be argon

THanks for your help

 

[herman]

That is almost certainly an industrial gas cylinder (not scuba), the threaded area under the valve is for a protective cap and the valve is a standard gas valve. It could have had a number of gasses in it, nitrogen, CO2, argon to name a few.

 

[2airishuman]

The dimensions and threads of the nipple and nut (that are in the valve outlet) should identify the class of gasses that the cylinder was used for. If the nut has reverse threads, it was used for fuel gas -- propylene, acetylene, propane, etc.

 

[rjack321]

The dimensions and threads of the nipple and nut (that are in the valve outlet) should identify the class of gasses that the cylinder was used for. If the nut has reverse threads, it was used for fuel gas -- propylene, acetylene, propane, etc.

Based on the hint of threads showing at the valve I think this is a fuel gas cylinder, propane seems most likely. There are also crown neck threads for a cap (which no scuba tank ever has), 500psi is too high for acetylene. Even with a scuba valve (which wont exist) this tank wouldn't have much breathable air at all. It is definitely not a scuba valve or scuba tank crown, or threading.

 

[rjack321]

Ok found it based on ICC-4B
These cylinders were used for a variety of flammable LP gases (ie propane) and some non-corrosive fluorinated gases.

Code of Federal Regulations