Old Cylinders from South Africa

[Office Girl]

Hi. I work for a shop that buys and sells used scuba gear. We had 3 tanks come in manufactured in South Africa in 1985, 1993, and 1995. I don't know the PSI or CF, it's all stamped in a different metric. Anyway, I took these to our local Hydro testing spot to get more information. I was told that these tanks can't be filled in the U.S, nor can they be serviced (hydro'd). Can anyone give me more in sight? They were Hydro'd in Trinidad in 2016.

 

[runsongas]

clear closeup pictures of the crown markings would be needed. but if they do not have a DOT stamp, then yes you cannot hydro those and get a stamp in the US.

 

[Boston Breakwater]

Hello. I'm kind of a "Bottle." nut. At first glance....I would say Coltri. They began making compressors in the 1960's They look to be in nice shape. The valves, and hand wheels are somewhat of a "Giveaway." as far as, recognition. I'm in agreement with @runsongas the shoulder markings are extremely helpful. Please, post them when you have time.
Underwater World - Durban (South Africa)
I'm sure they would be happy to help you.
Cheers.

 

[Scared Silly]

As they have no DOT markings they can be filled privately but can not be filled commercially. A requalification can be performed but not stamped.

 

[Sam Miller III]

@Office Girl

These tanks are "interesting"

Can you supply a better photographs of the tank and neck markings ?
Specifically interested in the stepped neck tank on the left in the picture .

It can be assumed that both tanks had flat concave bottoms since the were both standing up right
Correct ?

SDM

 

[Bob DBF]

Specifically interested in the stepped neck tank on the left in the picture

If you can enlarge the picture, both look stepped but the one on the right doesn't show because of the lighting,

Good to see you are out and about, in a cyber kind of way.


Cheers

Bob

 

[Sam Miller III]

@Bob DBF

Thanks Bob
I fear my eyes "aren't what they use to be"

I suspected if one was a stepped neck both were stepped necks-- needed verification
and I also suspect a concave bottoms..

Lots of US historical significance in these tanks-- their configuration !.
But unknown and certainly if known by OP their historical significance ignored by OP

Yes Bob still at it, but retired for over 20 years --Always wearing a mask every time I step out side ..
Son Dr Sam IV took my place now in the middle of the fray as also an ER & Hyperbaric doctor

Cheers from CenCal .

Sam 111.

@Office Girl -- try one more time

 

[Office Girl]

Thank you for all of your responses! Yes, the bottoms are flat. They do not have DOT stamped on them. I hope the additional pictures provide more insight. I am concerned because I can't sell them without giving our customers the correct information, and certainly do not want to sell them if they cannot be used, serviced, or filled. The valves are also smaller than the valves on any other tank I have seen come through here.

 

[Sam Miller III]

It is not the country of origin, the lack of ICC or DOT approval but the tanks configuration as related to its heroical significance in US diving history

I will explain tomorrow ,,,

SDM

 

[Diving Dubai]

@Office Girl

I noted the marking of 12l volume. In the metric world we multiply the volume by the service pressure.

Since they're steels I'll assume they're 230 bar (3300psi) which means 2760L of gas or 100cf in black and white units