• Welcome to ScubaBoard


  1. Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.

    Benefits of registering include

    • Ability to post and comment on topics and discussions.
    • A Free photo gallery to share your dive photos with the world.
    • You can make this box go away

    Joining is quick and easy. Login or Register now by clicking on the button

Steel Tank Condemned: Cracks in Threads?

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

  1. michael-fisch

    michael-fisch ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: Finally Lake City FL
    1,135
    839
    113
    It just keeps getting worse! There is no such thing as a spun steel tank.
    The manufacturing processes are either deep drawing and then rounding the neck and shoulder, or rounding the top and bottom of a steel cylinder and welding up the rounded bottom.

    Michael
     
    dead dog likes this.
  2. runsongas

    runsongas Great White

    # of Dives: 500 - 999
    Location: California - Bay Area
    4,175
    1,870
    113
    japanese asahi tanks are spun steel. also why they are very negatively buoyant like the heisers
     
  3. Barnaby'sDad

    Barnaby'sDad ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 50 - 99
    Location: Virginia
    1,127
    897
    113
    Ok. Let me just reach out to the defunct manufacturer (see @runsongas post) and tell them that they are incorrect in stamping “SPUN” on the neck of the tank.

    Internets, lol.
     
    DivingColeridge and rjack321 like this.
  4. tbone1004

    tbone1004 Technical Instructor ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
    17,546
    9,647
    113
    What is the specific tank in question?
     
  5. Barnaby'sDad

    Barnaby'sDad ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 50 - 99
    Location: Virginia
    1,127
    897
    113
    Exactly what @runsongas posted. A spun steel Asahi tank made in Japan.
     
    DivingColeridge and rjack321 like this.
  6. BurhanMuntasser

    BurhanMuntasser Dive Charter

    # of Dives: I'm a Fish!
    Location: Nomad
    6,177
    2,346
    113
    Everyone is going for the jugular and condemning the LDS and even accusing them of committing a federal offense :rofl3::rofl3:

    There should be a punishment for "condemning" an LDS without authority and verification I think.
     
  7. tbone1004

    tbone1004 Technical Instructor ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
    17,546
    9,647
    113
    I've still never seen one, but it would make more sense on one of these.


    There have been far too many shops that have condemned tanks and come to find out they were perfectly fine. I had a buddy have an AL40 condemned last year by a so called "tech shop" who's owner writes articles for TDI. It was VIP'd by them the year prior and condemned the next year. Why was it condemned? A crack in the threads. What was it actually? The machining mark from the tap. I took it to a hydro shop and had them hydro it and it passed both the hydro and an eddy current VIP. The shop refused to replace the tank until they were threatened with a lawsuit for unlawful destruction of property. I bet if you look through the archives here there will be several dozen threads about tanks that were wrongfully condemned. It is a safe first assumption that the person VIPing the tank screwed up, especially when it's something exceedingly uncommon.
    This shop happens to be one of the only ones with a DOT certified inspector, so happy days, but this is certainly a zebra. When you hear hoofbeats, think horse, not zebra. The horse in this case is a dive shop wrongfully condemning a tank and this circumstance is certainly a zebra based on the surprise by at least 4 tank inspectors that have piped in
     
  8. BurhanMuntasser

    BurhanMuntasser Dive Charter

    # of Dives: I'm a Fish!
    Location: Nomad
    6,177
    2,346
    113
    The dive shop called the customer and asked him to come down to check it out by his own eyes and to approve the condemnation. They didn't take it upon themselves to destroy the client's property, they invited him to come in person to check it and for him to approve or disapprove or walk out with the tank, professional and by the book operation.

    If everyone was judged by the sins of those that proceeded him, we will have to execute 90% of the world population. It isn't right now matter how much you try to rationalize it.
     
  9. ScubaBunga

    ScubaBunga Nassau Grouper

    # of Dives: 500 - 999
    Location: wright city, mo
    194
    128
    43
    I’ll agree this chain instantly went for the juggler on the lds. But having had a tank wrongfully condemned, that thought was the first thing to come to mind. But this lds did call and ask for the tank to be reviewed. +1 for that lds. In my vip class, my lds did talk about having to inspect new tanks because they had seen some (I think Japanese) tanks come in with really bad folds and/or messed up threads. Basically unusable right out of the box. Never had cracks, but I suppose even that is possible. If pictures are available it would be great. Its rare but sometimes things get past quality control, even more so when buying outside main manufacturers. Good luck with the next tank!!
     
    Barnaby'sDad likes this.
  10. Trimixdivin

    Trimixdivin Barracuda

    204
    5
    18
    I would call the tank manufactures as long as its not PST as they are long gone. If it fact its a potential defect they may cover it our work something out with you. Can't blame a dive shop for doing there job.
     

Share This Page