Argon Tank Date Stamp Question

[Wolfman]

I thought I knew how to read these, but I guess I don't. When was this tank tested?

[WelditU]

Looks like April 2021.

[smithdoor]

When go fill tank they tell the date.
Most tanks need to be tested every 5 years.
Some new tanks well 10 years.

Dave

FYI the marks after the date [+*] is 10 years test date and over fill by 10%
https://welditmyself.com/gas-cylinder-date-stamp/#12-would-you-like-to-see-an-argon-tank-date-stamp-example

I thought I knew how to read these, but I guess I don't. When was this tank tested?

[Rondo]

+ sign followed by a star sign means test is good for 10 years. Most customer owned cylinders only get the +. I did a fair amount of hydrotesting back in the mid 80's

[Wolfman]

FYI the marks after the date [+*] is 10 years test date and over fill by 10%

That is the part I actually understood.

It is the 18 that had me confused.

[Wolfman]

Doh! IA18 is the stamp of a specific independent tester. Confusion over!

[123weld]

i got one the same, but follwed by a '14 instead of '21, and i'm 1500 mi from u, so maybe tester and manufacturer, i think it was it's first stamp.

[danielplace]

+ sign followed by a star sign means test is good for 10 years. Most customer owned cylinders only get the +. I did a fair amount of hydrotesting back in the mid 80's

All mine are customer owned and all do have + and the star

[david.junge.77]

Interesting post, thanks for the replies, Australia is probably different though

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