I was given this tank

Please register or login

Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.

Benefits of registering include

  • Ability to post and comment on topics and discussions.
  • A Free photo gallery to share your dive photos with the world.
  • You can make this box go away

Joining is quick and easy. Log in or Register now!

Fyffer

Contributor
Messages
96
Reaction score
37
Location
Vancouver bc
# of dives
0 - 24
64A53B09-F9F1-4DE2-B898-3896E5242D33.jpeg
A969691E-8274-4BA5-8E36-3F950D29EF26.jpeg
38AD20FE-9475-4AC5-A96D-33F46734EE51.jpeg
CA3C1A45-DC0F-4C6C-9487-23241816DDF6.jpeg
so neighbour gave me this tank. I think it a lp 72 or lp 85. Any info be great. Thank you.
 
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!
 
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.
 
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
 
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.
 
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.
 
https://www.shearwater.com/products/perdix-ai/

Back
Top Bottom