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Thing is, you can't. If the numbers have been marked out, it cannot be re-tested at a licensed test facility. They could get their DOT Certification pulled...
I had a set of 72’s plus stamped, then took another set in the next year and hydro shop seems to have forgotten what a plus was. After two months of the dive shop talking to them, I looked up their RIN and contacted them directly. I gave them all the online docs and Luis’s paperwork (@Luis thanks again for all your posts and replies to my questions). After talking to the hydro guy again (he was a nice guy but not a diver and no idea why I even wanted the plus), I did get my tanks back with plus stamps. I did ask for all the paperwork on the tests and what values were used for plus (I had pst and norris tanks), and after a few more weeks simply got the answer “the values you gave me”. No actual paperwork to show/prove for next time. My guess is he used the pst value for all the tanks. He did text me the prestretch process and when I asked he said it applied to my tanks so he sent it. Which I guess is good…
How many do you have? Do you want to get rid of them?early 70’s Walter kidde soda bottom 72’s?
I just have the one. 1/2 straight thread valve but I do love diving it. Just wish I could get it plus’d. it’s a 2400psi. I got it for free and thought it was a normal pst. It sat in my basement for 6 months or so until I looked at it. If I can find three, I’ll go back to Luis’s documents, ultrasound them and calculate the ree. I may have an opportunity to help or take over hydro tasks for a local dive shop.How many do you have? Do you want to get rid of them?
Those are my favorite steel tanks.