German tanks in US….DOT cert

[Still Kicking]

There's no recognisable compatible standards between the US and UK/EU for tanks apparently.

There are now ISO tanks on the market that are internationally recognized. Adoption has been slow but if moving tanks back and forth between US and Europe is necessary, these are the ones to get.

https://allsafe.net/wp-content/uploads/2020/01/ISO_vs_DOT_Cylinder_Summary.pdf

 

[Omb]

Ok….I think this is solved. Bottom line…use your own compressor or transfill and get someone to hydro every 5 years.

One more question: These tanks say 8.5L. I read somewhere that US and Euro tanks measure that differently. Something about water volume. That said, how would these compare in terms of max cubic feet of air to a US spec LP50 twinset? These 8.5L tanks have a working pressure of 232 bar. Reason I ask is that I am trying to decide what to replace them with here.

 

[Mod63]

that would be roughly 60 cft

 

[Omb]

So using the formula I found on dive gear express, I came up with

8.5L x 232 bar \ 1.01 bar = 1952 L ideal
1952L/1.03=1895 L

1895L = 66.9 cubic feet

so about 133.8 cubic feet for the pair. Does that sound right?

 

[BoltSnap]

So using the formula I found on dive gear express, I came up with

8.5L x 232 bar \ 1.01 bar = 1952 L ideal
1952L/1.03=1895 L

1895L = 66.9 cubic feet

so about 133.8 cubic feet for the pair. Does that sound right?

Can you please give the link for the formula?

 

[Omb]

Calculating SCUBA Cylinder Capacity | Dive Gear Express®

Or why does my Aluminum 80 SCUBA tank only hold 77 cubic feet of air? ©2018-2020 by Mark Derrick, Gas Blending Instructor at Dive Gear Express ...

www.divegearexpress.com

 

[Still Kicking]

Ok….I think this is solved. Bottom line…use your own compressor or transfill and get someone to hydro every 5 years.

No US hydro facility will test non-DOT tanks but if you have your own compressor, you can fill them.

 

[Mod63]

So using the formula I found on dive gear express, I came up with

8.5L x 232 bar \ 1.01 bar = 1952 L ideal
1952L/1.03=1895 L

1895L = 66.9 cubic feet

so about 133.8 cubic feet for the pair. Does that sound right?

yup, if you get 232bar fills , I calculated with 200bar which is more the norm

 

[Wibble]

You can over-pump those cylinders too. Loads of gas in them.

8.5 litres x 250 bar/ATA = 2125 litres of gas per cylinder.

Don't need any gas fiddle-factors as your SAC's approximate anyway.


For sidemount those tins are just about perfect.

 

[rob.mwpropane]

No US hydro facility will test non-DOT tanks but if you have your own compressor, you can fill them.

Not true, very unlikely a US outfit will stamp them.. you can find one to test.