Whose moronic idea was it to stamp the cylinder crown?

[mr_v]

I am with the OP on this one - stamping a cylinder may not be the most elegant, modern way to indicate that it passed tests. A good sticker could do. But then some jokers would replace the sticker w/o tests; hence, the stamp.

 

[OMyMyOHellYes]

It is just another example of PADI and the deep state trying to control our lives. Stand up for your rights, get a big angle grinder and grind off all those numbers.

Wait - PADI is part of the DEEP STATE establishment ?!?

This explains SO MUCH !!!

 

[Tanks A Lot]

[...]A good sticker could do.[...]

A sticker is not durable enough, especially in busy dive centres where for example the aluminium bottles get chucked onto the back of a truck, banging against one another.

A permanent solution like stamping is superior.

 

[boulderjohn]

A sticker is not durable enough, especially in busy dive centres where for example the aluminium bottles get chucked onto the back of a truck, banging against one another.

A permanent solution like stamping is superior.

Yep. I have seen visual inspection stickers not last more than a month. Here is another thought about those visualization stickers--a quick Google search will get you a variety of sources for visual inspection stickers you can put on yourself.

 

[Tracy]

Yep. I have seen visual inspection stickers not last more than a month. Here is another thought about those visualization stickers--a quick Google search will get you a variety of sources for visual inspection stickers you can put on yourself.

If that is your concern, a trip to Harbor Freight or Amazon will get you stamp sets.

 

[Belzelbub]

I fail to see the problem with stamping tanks. It’s a small stamp in an area where the material is thicker. This is a compressed air cylinder used for scuba diving. It’s going to get bumped around. A small stamp is not going to cause me any worry. Most of my tanks have multiple hydro stamps. Oh, and the manufacturer stamped a string of letters and numbers on the shoulder of the tank as well.

I’ve worked with regulated industries for much of my working life. There are often specific requirements around marking. One of those is that the marking is permanent, or at least unlikely to come loose in normal use. A sticker on a scuba tank is likely not going to cut it.

 

[Learner Diver]

(eg Australian and international) all dictate where the stamps need to be put.

Prove it.

 

[Learner Diver]

I assume you don't really mean the entire science behind scuba standards, because that would require a book. In the context of this thread, I assume you are referring to the standards for the hydrostatic inspection of scuba cylinders. The answer is simple. There are no scuba standards for the hydrostatic inspection of scuba cylinders. The standards and rules for those cylinders apply to ALL cylinders, only a fraction of which are for scuba, so there really are no scuba standards for them.

So in fact, any marking to determine a cylinder has been inspected and tested can be attached to the cylinder?

 

[Alogansailor]

One of the LDS asked me to slice the head of an AL80 tank for display in their classroom. Pretty cool to see a cut-a-way side view of a tank. Now I need to find a steel tank to do the same to see the comparison.

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I found this older post. The crown is thicker than the walls. That is why they are stamped there. If I recall correctly, a stamp on the wall is disqualifying because it doesn't have the same thickness.

 

[Tanks A Lot]

Prove it.

As for the original question, BS EN ISO 13769-2018 - Cylinder Stamping lays out quite nicely where and how cylinders shall be marked.

Maybe you skipped over this, but it does indeed set forth the rules for stamping.

So in fact, any marking to determine a cylinder has been inspected and tested can be attached to the cylinder?

No, you may want to read the earlier attached document for clarification.