Is this normal for scuba tanks?

[2airishuman]

Can I take the tank somewhere to get certified, they can't test it and certify it? that seems pretty ridiculous.

No, they have to be certified at the time of manufacture, because many of the things that the cylinder must comply with cannot be verified except at the time of manufacture. For example, in the USA, an aluminum cylinder must be made from a single block of cast aluminum, and that block must have a specific composition of metals in its alloy, and must have a tensile strength within a specific narrow range. And a six sister cylinders made by the same process must be pressure tested, three to at least 10,000 times, and three to the point where they are destroyed. At least one out of every lot of 200 cylinders has to be destructively tested in various ways.

Cylinders are arguably more complicated to make than any other piece of dive gear.

 

[2airishuman]

You guys are just being extra, it is literally approved and deemed safe in Europe.

Actually, it has a stamp on it that purports to indicate that it meets European approvals. There have been problems with some cylinders from China having falsified markings. I understand that you imported it yourself from a seller in China who you do not know. How can you say with confidence that it is "approved and deemed safe?"

aka, It's safe anywhere, just like how Canada doesn't approve US DOT tanks. Countries just like to have their own ****.

Actually, cylinders sold in Canada and the USA are typically approved for use in both countries.

The manufacturing process is literally the EXACT same.

I think it's ridiculous you guys are making this big of a deal about it, the tanks are manufactured the exact same way.

How do you know that? This is how cylinders must be manufactured for the U.S. market.

 

[chillyinCanada]

Chinese stuff can be tough to know what's real fake or otherwise.
I personally would not have a huge problem using it..
Pumping by hand the bottle will not see any heat... I have welded pressure vessel that take 3000psi at home no problem...
Steel is way more forgiving...
With aluminum they work on ridgitiy...
If worried put it in a bucket of water and keep submerged... fill the bucket right full of water. Then fill the tank with air to rated pressure.. if no water spills it should be fine... there is no expansion of the tank... a lid on the bucket would be best.

There's paint or something on the inside of the tank.

Personally, I don't want him breathing in any microchips of whatever it is he's been able to chip off.

 

[tursiops]

He is looking for confirmation that everything is OK, when it is not. The tank was manufactured in 2021, but uses markings that were long ago discarded. The Pi reference is from 2002. The tank manufacturer is likely faking the entire certification process. He is happy and looking for even more information that it appears he will either ignore, misunderstand, or twist to fit his narrative. This is a train wreck.

 

[chillyinCanada]

Yes sir, and he says the tank is perfectly fine. I just need to clean the stuff out and it'll be great. He just got a DOT tank that we are going to use to fill this smaller one.

How long has your dad been diving and what are his certification levels?

 

[uncfnp]

Hey guys. Give it up. I thought the posts sounded like a young male so checked his profile. Yep.

 

[Seaweed Doc]

If it helps I feel perfectly fine, and I felt fine while and after using it. I also filled it up a little more, only to like 50 bar. Then pushed the regulator, aiming it on a wet towel until it was emptied, nothing came out.

My bigger concern would be a chunk of "stuff" breaking loose and clogging the valve.

Why not get the tank professionally tumbled? Unless you have a roller at home to tumble it?

 

[2airishuman]

Chinese stuff can be tough to know what's real fake or otherwise.
I personally would not have a huge problem using it..
Pumping by hand the bottle will not see any heat... I have welded pressure vessel that take 3000psi at home no problem...
Steel is way more forgiving...
With aluminum they work on ridgitiy...
If worried put it in a bucket of water and keep submerged... fill the bucket right full of water. Then fill the tank with air to rated pressure.. if no water spills it should be fine... there is no expansion of the tank... a lid on the bucket would be best.

I believe that this is some of the worst advice I have seen posted on Scubaboard in the many years I have participated here.

 

[Gone for diving]

At least he is doing stuff and not on drugs playing video games and doing nothing with his life...
He wants information give it... don't get all personal. Thats life, how to find the info you need.
he has the tank anyway and is using it..
Let him make an informed decision..

Sounds like the 90's
can't mix gas and dive it. you'll kill yourself...
Now we have trimix and nitrox....
killer gases... which you can use if you have a little plastic card....

Read and get informed on whatever you are doing.. and don't tell others online about your ideas... scuba police will come after you.

Can't be done people need to .Move over for the people that are doing it.

 

[2airishuman]

If it helps some of you sleep at night, I got a large DOT tank that I'm going to use to fill the smaller one. Anything, in particular, I have to do with the DOT tank, I know it has to be serviced and inspected at certain time intervals, what are these time intervals, and what else do I have to do to be on the safe side with it.

That should have been covered in your open water training materials. There is an annual visual inspection, and a hydrostatic test required every five years.