Deciphering the code

[Westwinds]

I am seeking the assistance of those who can deciphering the markings that appear on the neck of a tank.

The 80 cu.ft steel tank in question has the following markings: DOT-E12079-3500 TP5250 SPUN

I am most interested in the manufacturers information. I would also find it very helpful if you can direct me to their websites.

Thanks, Westwinds

 

[ScubaRon]

Here you go:

DOT = government agency/approval
E12079 = metal type (I believe E is aluminum)
3500 = working pressure in psi
TP5250 = serial number
SPUN = manufacturer (don't know which company this is)

according to the PADI Encyclopedia of Recreational Diving.
ScubaRon

 

[Hallmac]

Westwinds once bubbled...
The 80 cu.ft steel tank in question has the following markings: DOT-E12079-3500 TP5250 SPUN

Thanks, Westwinds

It is a steel tank manufactured for Catalina in Japan.

Dot- E12079 is the US department of Transportation Exemption number.

3500 is the cylinder fill pressure

TP5250 is the test pressure that is used during Hydrostatic testing

Spun is the method used to form the tank

Here is the link to the DOT exemption Page.

DOT-E12079


Hallmac

 

[COVCI]

Here is the info you need:

DOT = United States Department of Transportation--Governing Agency responsible for approval for use in US

E12079 = DOT exemption number issued to Japanese company named ASAHI giving permission to manufacture and distribute cylinders in the US. Normally distributed under the Dolphin brand

3500 = Rated service pressure...can be legally filled to 3500 psi.

TP5250 = Test Pressure used by Hydrostatic retester to recertify cylinder.

SPUN = Method of production used in manufacturing process. The cylinder is created by spinning a tube of material and rounding off the bottom and the crown. This typically will create a small dimple on the inside of the cylinder on the bottom. This is not a defect or flaw, but can be a place to hold water if ever introduced to the inside of the cylinder.


Hope this helps...

Chris

PSI Inspector Trainer