I was given this tank

[Fyffer]

so neighbour gave me this tank. I think it a lp 72 or lp 85. Any info be great. Thank you.

 

[akdeepdiver]

Steel tank
Made in June 1973
Made By Norris cylinders
2250 psi

 

[Fyffer]

Steel tank
Made in June 1973
Made By Norris cylinders
2250 psi

Thank you. Would u know the cu size. Lp85. Lp72. ? Thanks

 

[ScubaBunga]

72, looks like a few I have. Looks like it might have had a coating on it that has been removed, which is good. Looks in good shape from the outside. Enjoy!

 

[CT-Rich]

This is a pretty classic cylinder. A hydro and a valve and you will really love it. Steel tanks trim out differently than an AL tank. They don’t float up tail first when they low.

 

[Bob DBF]

When I'm lucky I can find this post and pass it on. If your tank generally meets these specs, it's an old steel 72. And a fine tank,I might add.

This data came from one of my US divers 1970's maintenance and repair manuals:

72 cu ft Standard

Service pressure, psi : 2250
Actual air capacity, ft3 (at 2475 psi): 71.55
Outer diameter, in: 6.81
Length without valve, in: 25.12
Empty weight, lbs (w/o valve): 26
Buoyancy Empty, lbs (w/valve): 0
Buoyancy Full, lbs (w/valve): -5.4

They are not all the same. As mentioned above, there were at least two manufacturers of this cylinders, and they were built for many years. They came with 1/2" tapered pipe thread, 3/4" straight pipe thread, and some even had 1/2" straight pipe threads (mostly Sportsways).
Out of all my 72's one in particular is taller than the rest. There are also other smaller variations.

And a tip of the hat to Luis.

Bob

 

[Fyffer]

Thank you everyone. Now decide to keep or not. Thank for the help.

 

[ScubaBunga]

If you were closer i’d Offer to take it odd your hands, but not worth it (to me as I have several already) to ship it. I have 10+ (Norris and pst) of these steel 72s and love them.

 

[Kharon]

Your tank has the hydro plus rating. When you get a hydro make sure they do the plus test. To reach full capacity you need it. Without the plus test the operating pressure is 2250 psi. With it it's 2475 psi and that pressure is needed to give you the full capacity of the tank. At 2250 it's a short fill by 10%.

One thing is curious to me. I thought LP steel tanks were 2400 not 2250 for a plus fill of 2640. All mine are 2400 psi.

+1 on the buoyancy charistics of steel.

 

[Fyffer]

I make sure I do. Still not sure I’d i even get it hydro done.