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Steel tank questions

Discussion in 'Tanks, Valves and Bands' started by BigRed96, Aug 20, 2020.

  1. BigRed96

    BigRed96 Nassau Grouper

    # of Dives: 100 - 199
    Location: New Richmond, Oh
    190
    84
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    Thanks for the info! I was thinking about removing the coating. I wonder what the best way to do it is? I can sandblast them or I wonder if Aircraft Stripper will work? My plan is to get them VIS and Hydroed and Mount two of them up as doubles.
     
  2. James79

    James79 Reinventor of Wheels ScubaBoard Supporter

    # of Dives: 50 - 99
    Location: Lower Alabama
    763
    964
    93
    I haven't dealt with the vinyl, but what I've read is that it is a cast iron B*tch to remove. I would try the aircraft stripper (chemicals, not girls... though if you can get girls to scrape the tanks for you, even better! lol) and a putty knife to start. I would be careful of what media I used if I went with blasting (making sure it's something that won't take down the steel).
    Let us know how it goes.
    Respectfully,
    James
     
    apenland01 and BigRed96 like this.
  3. Dark Wolf

    Dark Wolf Solo Diver

    # of Dives: 200 - 499
    Location: SW Missouri
    861
    464
    63
    Your top two look just like the 72's I recently doubled. The epoxy on the outside of mine has seen better days, and I will strip them this winter.

    Hope you enjoy them!!

    DW
     
    BigRed96 likes this.
  4. captain

    captain Captain

    10,305
    10,645
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    Sand blasting the vinyl is like sand blasting rubber, it doesn't work. I find stripper doesn't affect vinyl. Use a large knife with two hands and use a drawing motion. Not easy or fast but it is the best method I have found. Sometimes there are sections that have unbonded from the tank and peel off easily.
     
    Dark Wolf and BigRed96 like this.
  5. BigRed96

    BigRed96 Nassau Grouper

    # of Dives: 100 - 199
    Location: New Richmond, Oh
    190
    84
    28
    I measured the tanks today and the cane in at 25” tall and about 7 inches wide.
     
  6. James79

    James79 Reinventor of Wheels ScubaBoard Supporter

    # of Dives: 50 - 99
    Location: Lower Alabama
    763
    964
    93
    Yep, your basic old school 72's.
     
    captain, Dark Wolf and BigRed96 like this.
  7. BigRed96

    BigRed96 Nassau Grouper

    # of Dives: 100 - 199
    Location: New Richmond, Oh
    190
    84
    28
    I’m looking to start stripping the finish off two of the three yellow tanks and though I would ask some things about the process before I proceeded. Would it be better for me to strip them with air in the cylinders or remove the valves and work on them then? Worried about flash rust. Next question, would you have them vis and hydro tested prior to starting work or risk a failure after putting in all the work? I have been toying with the idea of coating the tanks in a product called Raptorliner. It’s a spray on diy bedliner that can be colored to the user’s preference. Only downside is it leaves a bit of a uneven finish and may make tank markings difficult to see. However, I wouldn’t think it wouldn’t be any worse than the vinyl and may not even be as thick. I used it to spray the interior of my dive trailer and like it’s durability.
     
  8. Ghost95

    Ghost95 Barracuda

    # of Dives: 1,000 - 2,499
    Location: Florida
    419
    405
    63
    Be careful if you put bed liner on the tanks. It could possibly cause the same issues you're trying to avoid by stripping the current vinyl off, mainly rust behind the paint.

    If it were me, I'd do a cold galvanized spray paint if they're not already galvanized.
     
    BigRed96 likes this.
  9. ScubaBunga

    ScubaBunga Nassau Grouper

    # of Dives: 500 - 999
    Location: wright city, mo
    194
    128
    43
    I used some citric acid remover and it loosened the coating enough to get it off....but it was still a LOT of elbow grease. Some peeled off easily and some held on for dear life. I like these tanks so it was worth it for me. The cold galvanized or I found a primer ( which I can’t find a link to now) that seems to work on the galvanized tanks - I like to paint some of them. But don’t put any other type of coating on the tank. I’ve also tumbled out many liners. It is quite a pain to do! Like others, I’d be happy to take those old dangerous bombs off your hands and dispose of them properly...by using them for a long time.
     
    BigRed96 likes this.
  10. ScubaBunga

    ScubaBunga Nassau Grouper

    # of Dives: 500 - 999
    Location: wright city, mo
    194
    128
    43
    New valves will fit, or you can service the old valves. You’ll need new burst disks as those old ones are not allowed - need the newer ones with the side relief holes..and you’d want to replace those anyway as they are quite old. Vintage double hose has the 2250 burst disks. Then finding a hydro place that will plus them will be another challenge. It took me a couple years to find one that would, but my last 5 now have new plus stamps on them!
     
    BigRed96 likes this.

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