I'm looking for a couple of the older LP72 2250psi steel tanks.
Prefer picking up/meeting in Orlando or Cave Country.
Tanks must be verified to not have the liner in them.
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I'm looking for a couple of the older LP72 2250psi steel tanks.
Prefer picking up/meeting in Orlando or Cave Country.
Tanks must be verified to not have the liner in them.
Oh you and your damn vinyl liner.
Quote:
Originally Posted by kensuf
At the risk of sounding very hipster...Nothing wrong with vinyl as long as it's spinning and flat with little grooves!
Seriously I've heard of a few folks who managed to tumble the liner out of these tanks but it chews up equipment and takes a long long time. Not worth it!
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Takes me 30 seconds to sand blast them clean. Takes me 6 months to break out the sand blaster and set it up. Yes, 2 weeks of tumbling 'might' clear it out, or maybe 3 weeks; not worth the effort that way. But if you get any with the liner, I'll trade one in hydro for two with liners. :)
You sound like a hipster just asking for some steel 72s.Quote:
Originally Posted by Red Hat Jef
What are you doing with them, anyway?
Bob
I have removed the vinyl liner in 6 tanks. 4 were a reddish brick color and 2 were some black stuff. Took 8 days of dry tumbling, 24 hours a day per tank. Used medium ceramic chips. The tumbler worked just fine (and still does). The chips came out in good shape too - a little smoother maybe than when they went in. But the tanks were as shiny as new ones and even the bottoms/crown were clear of the liner. I then used the tanks for 10 years or so before selling them - still in service as far as I know. Some were 1972 original hydro, but I don't remember the other original hydro dates. 74, comes to mind.
skip
Wow! Good to know. I guess the folks I talked to didn't have the patience to stick it out for 8 days!Quote:
Originally Posted by skip
Gonna try leaving them in caves where the water likes to eat aluminum and see if they fare better.Quote:
Originally Posted by floridabob
Interesting. Find it hard to believe this would be the first such experiment, what has your research brought you?
Also, I have one you could use for the test. What do you want in it? 18/45?
Take a look on Jax craigslist. He has around 8 of them, but I they appeared to be lined, so i passed on them for now. Some looked stained/discolored, but there were a couple where the liner did not look to bad.
I might take you up on that. TJ. I have a buddy with 2 lined tanks he hasn't used for years since he can't get a VIP.Quote:
Originally Posted by tj
I have two without a liner that I don't need,but out of hydro. PM me if interested.Quote:
Originally Posted by Red Hat Jef
at the risk of opening an old discussion topic.....what is the real problem with the tanks with the "liners" ? our shop still has quite a few in rentals and they are used regularly. i myself bought a pair to use for sidemount. they are from the late 1960's and according to the tech at the store, the "liner" is in perfect condition.
i had been told by someone that these should not be used with higher O2 mixes but the store tech said that was untrue. not sure who to believe. not really an issue for me as i have no reason to use any mix other than air at this point. but for future use it would be nice to know the truth.
thx
The bigger issue is that the inner surface of the tank can not be inspected. Some people are willing to pass a cylinder if the lining is intact and not peeling. Others like me feel that it is impossible to tell what is going on under that lining even if it is intact.
Thats what I was taught. Dont approve them because just because the liner looks great, doesnt mean the tank underneath isnt pockmarked with problems.Quote:
Originally Posted by kwinter
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I would like to know how many of those evil lined steel 72's failed to pass after tumbling or sand blasting. I have a few of them still used now and then which is more than I can say for the aluminum 80's purchased 10 years after the 72's. They (aluminum 80's) are gone with cracked necks.Quote:
Originally Posted by rddvet
You're talking to different animals. Once the liner has been tumble or sandblasted out you can properly inspect them. I was taught if the liner is still in place you can't 100% confirm that they're ok.Quote:
Originally Posted by RGU
I have passed 6 tanks and failed 2 due to severe pits in the bottoms after liner was removed. But the liners were obviously compromised before tumbling so we expected a pitting problem. We did not hydro them - they failed the visual inspection. The other 6 were either clean and smooth liners, or possible small cracks in the line and came out shiny and smooth like new after tumbling. Used in partial pressure blending nitrox with no issues for many years and still in service as far as I know. But if you can't see the inner surface of the steel tank because it's covered, then you can't really fulfill the obligations of a visual inspection and so should not pass it. You can assume since the liner is fine that the tank under the liner is fine too, but it will always be an assumption.Quote:
Originally Posted by RGU
skip
Skip, I am not sure if the two 72s I got from you fall into this group.. But they just passed VIP at Amigos and should be back from Hyrdo on Wed. (FYI)Quote:
Originally Posted by skip
Mark