Whose moronic idea was it to stamp the cylinder crown?

[Learner Diver]

Recently I visited an address to purchase a cylinder which the owner was selling. It had about 3 stamps on the crown which looked quite dodgy. I questioned why they were there and he said it was part of scuba safety standards. I asked him is that everywhere. He told me the UK was 3 years, the US was 5, China was 3 and Thailand was 7. I asked him why such a discrepancy. He just told me I was lucky I don’t dive in Australia where they purposely punch holes in your cylinder so as to make you purchase a brand new one every few years. I declined to buy the cylinder on grounds I wanted a second opinion.

 

[BoltSnap]

What is your question specifically?

 

[runsongas]

the crown is thicker so safer to stamp than the sidewalls for a pressure vessel. I take back my reply on your other post, maybe you don't have the common sense suited to be a diver.

 

[joebob24]

I think you are asking if this is a real requirement? Yes, this is real. Cylinders get re-tested on a regular basis and they stamp the neck of the cylinder with quite dodgy looking stamps to show when it was last tested. If you don't like it, you will have to buy new cylinders every few years depending on where you live.

 

[Outbound]

Learning about hydrostatic testing requirements is part of open water training. At least for PADI. Did you skip that section?

 

[MidOH]

For the record, dive ops gloss over the tank hydro stamps extremely fast in training.

Because most of their tanks on the boat aren't up to date. The last thing they want, is noobs checking the stamps.

 

[Edward3c]

Recently I visited an address to purchase a cylinder which the owner was selling. It had about 3 stamps on the crown which looked quite dodgy. I questioned why they were there and he said it was part of scuba safety standards. I asked him is that everywhere. He told me the UK was 3 years, the US was 5, China was 3 and Thailand was 7. I asked him why such a discrepancy. He just told me I was lucky I don’t dive in Australia where they purposely punch holes in your cylinder so as to make you purchase a brand new one every few years. I declined to buy the cylinder on grounds I wanted a second opinion.

You got the U.K. (and other country) time frames wrong. Read the ISO on cylinder testing.

 

[Learner Diver]

You got the U.K. (and other country) time frames wrong. Read the ISO on cylinder testing.

UK Cylinder Testing Protocols To Change?

The UK recreational and technical diving industry is continuing to lobby against a forced change to a proposed ISO cylinder testing standard.

xray-mag.com

I found the link. Yes, you're correct.

 

[Edward3c]

UK Cylinder Testing Protocols To Change?

The UK recreational and technical diving industry is continuing to lobby against a forced change to a proposed ISO cylinder testing standard.

xray-mag.com

I found the link. Yes, you're correct.

That information is out of date, as the U.K. got a special amendment to the ISO. I was on the BSAC board (the U.K. Governing Body) at the time.

Testing:
O2 cleaning = 15 months.
Visual = 2.5 years,
Hydrostatic = 5 years.

The cylinders most at risk are 3Lt and less.

 

[boulderjohn]

For the record, dive ops gloss over the tank hydro stamps extremely fast in training.

Because most of their tanks on the boat aren't up to date. The last thing they want, is noobs checking the stamps.

So dive operations tell their instructors to gloss over these requirements to cover up their inspection failures? Do they also tell their students to ignore that portion of the agency-provided academic materials? Is this true of all of the thousands of dive operations in the world?