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Steel Tank Condemned: Cracks in Threads?

Discussion in 'Tanks, Valves and Bands' started by Barnaby'sDad, Oct 19, 2020.

  1. rhwestfall

    rhwestfall Woof! ScubaBoard Sponsor

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    So, if one was to use a steel pick, and cross the apparent fault feature, if it was a tap mark, it would bump up, if a crack, it would drop, right?
     
  2. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass Staff Member ScubaBoard Sponsor

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    Yep to the first. Maybe to the second. Most picks aren't fine enough, nor cracks wide enough to drop.


    But this pic is straight out of the PSI/PCI VIS class on tool marks.
     
    AfterDark likes this.
  3. Barnaby'sDad

    Barnaby'sDad ScubaBoard Supporter ScubaBoard Supporter

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    Guess I should have posted a poll.:popcorn:
     
  4. rhwestfall

    rhwestfall Woof! ScubaBoard Sponsor

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    time for a Dye Penetrant Inspection.....

    Curious, would a visual eddy reveal anything here?
     
    AfterDark and letterboy like this.
  5. KWS

    KWS ScubaBoard Supporter ScubaBoard Supporter

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    This I would call a crack. if all the marks were like the middle one and they were every 1/3, 1/4th or 5th around the threads I would call it a tap stop.
     
    AfterDark likes this.
  6. KWS

    KWS ScubaBoard Supporter ScubaBoard Supporter

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    probbly not as the eddy machine has to be made for the alloy if you were thinking about using the 6531 or 6061 eddy machine.
     
  7. 2airishuman

    2airishuman ScubaBoard Supporter ScubaBoard Supporter

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    Looks more like sloppy threading work than a crack, to me.

    Why would anyone want an Asahi cylinder anyway? They're unnecessarily heavy. LDS may be doing you a favor.
     
  8. Boston Breakwater

    Boston Breakwater "Outlaw." Solo Diver ScubaBoard Supporter

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    :popcorn:
     
    StefinSB likes this.
  9. BurhanMuntasser

    BurhanMuntasser Dive Charter

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    I believe that it is painted on with crayons. A conspiracy with epic proportions by an evil LDS wanting to sell more tanks using a fake DOT licensed inspector.
     
    AustinV likes this.
  10. runsongas

    runsongas Great White

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    ultrasonic examination would be definitive if you can find a retester with the equipment
     
    AfterDark and letterboy like this.

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