Help identifying old steel tanks

[Bowers]

Today I acquired a couple of old scuba tanks that haven’t been used since the early 90’s. I’ll do a visual inside and see if they are worth getting a hydo done. But im unable to figure out what volume of tanks they are and figured i’d ask on here before doing a volume measurement and some math lol. They look similar in size to an lp95 but are rated to 1800psi with the + on the first hydro. Born in 1977. Let me know if you recognize the size!

 

[Bob DBF]

Today I acquired a couple of old scuba tanks that haven’t been used since the early 90’s. I’ll do a visual inside and see if they are worth getting a hydo done. But im unable to figure out what volume of tanks they are and figured i’d ask on here before doing a volume measurement and some math lol. They look similar in size to an lp95 but are rated to 1800psi with the + on the first hydro. Born in 1977. Let me know if you recognize the size!

I do like the ScubaPro valve with built in gauge, unfortunately I can't help you with the tank, as I've not seen an 1800# tank with a standard scuba valve.

 

[Tanks A Lot]

Size is always hard to judge from a picture. At least the one you photograph from close-up appears to be a Worthington cylinder. Unfortunately the data I have for their 1800psi cylinders only goes to 8.0L. I would assume your cylinders are bigger, but maybe you have any luck with the below.

Water Capacity (L)	Working Pressure (Bar)	Diameter (mm)	Length (mm)	Empty Weight (Kg)
1.8	125	115	265	2.4
2.1	125	102	345	2.5
2.9	125	140	290	3.7
4.0	125	140	375	4.6
4.3	125	140	385	4.7
6.0	125	140	515	6
8.0	125	175	477	10.5

 

[Bob DBF]

@Bowers you might also post this in the vintage forum, some of those guys still dive the old 1800# tanks, and might know what it is. 1800# service pressure was the standard before the 2250# tanks, which was the usual before the 3000# Aluminum came out.

 

[VikingDives]

The first (?) hydro stamp looks like a metal impact stamp, but this is all way before my time...

 

[runsongas]

vintage lp53, not as fat as the modern lp95. can turn them into small doubles for a DH

 

[Bowers]

vintage lp53, not as fat as the modern lp95. can turn them into small doubles for a DH

Thank you! I may hold onto them but more than likely they’ll be up for sale in the near future. I like my modern lp50’s more lol

 

[rx7diver]

vintage lp53, not as fat as the modern lp95. can turn them into small doubles for a DH

I think I see "DOT" stamped on the cylinder. Wouldn't vintage show something else, like "ICC", instead?

rx7diver

 

[runsongas]

the pictured one is a 3aa and isn't old enough to be born before DOT was formed. the 3A 1800 surplus tanks were all old enough be ICC