Constructive criticism

  1. KimB

    KimB Member

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    What’s DT
     
  2. slim_boy_fat

    slim_boy_fat Forum Supporter

    Destructive test?
     
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  3. KimB

    KimB Member

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    That’ll be it. Thanks :)
     
  4. Richard.

    Richard. Forum Supporter

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    Distructive testing.
    so you destroy the item to find either it’s limit or find hidden flaws.
    Charpy, nick break, face/side/root bends , macro are all forms of DT.

    NDT is non distructive testing. So you carry out tests on your job or sample but don’t actually cause it any harm. Ut, X-ray, die pen, magnetic particle etc.
     
  5. slim_boy_fat

    slim_boy_fat Forum Supporter

    They used to use that in the North Sea [involved dye etc? :confused:] - do you know if that's still the case?
     
  6. Hood

    Hood If it walks like a duck....

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    Yes, I do work on occasions for RSL NDT and one of the things I do is make lenses for UV Underwater torches which I believe is used in conjunction with a dye.
     
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  7. Richard.

    Richard. Forum Supporter

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    Dye penetrant?
    Possibly. It’s by far the easiest, cheapest form of testing for surface defects. No leccy and minimum skill level. Down side it tells you nothing about what’s below the surface.
    Your cast iron drill clamp was dye pen tested before and after welding to check for hair line cracks.
     
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  8. addjunkie

    addjunkie Member

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    They still do, as well as all the other NDT things mentioned. Scar radiography is all the rage these days if they can get away with it, on existing stuff
     
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  9. DTS Member

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    Most of these designs have a plate welded on the base of the intersection. But having seen the riddor when a contractor nearly dropped a 5t machine into a canal in Birmingham, I’d not sure internet advice cuts it with the HSE ;)
     
  10. Paul.

    Paul. Moderator Staff Member

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    I'm talking destructive load testing not weld testing, sure 10mm plate is unlikely to fail, but its also made from 5mm wall box with cantilevered, tensile, shear and compressive loads, quite a lot going on for a simple spreader, all hot air though, it aint going to fail. (as long as the welds are sound)
     
  11. Welderpaul

    Welderpaul Moderator Staff Member

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    It does give you confidence in your welds to see how much force it actually takes to break them apart. I welded some lifting lugs for lifting pre cast wall panels some months ago, they were 25mm plate, 12mm FW. Designed for a SWL of 12T & 25%. They were taken up to 52T and held. 50T was the limit of the test rig. The eyes deformed somewhat though
     
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  12. Revs1972

    Revs1972 Forum Supporter

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    Out of curiosity , did you weld cheek plates either side of the hole ?
     
  13. knighty Forum Supporter

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    didn't mean to be negative about your design - my reply was more towards the other posters suggesting how to beef it up

    a bit of flat bar is the quickest/easiest/simplest/strongest way to do that
     
  14. Welderpaul

    Welderpaul Moderator Staff Member

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    Yes, 10mm plate each side of 25mm plate
     
  15. Bonser Member

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    Location:
    N/Wales UK
    Hi KIm

    Here's some padeyes for you, something we knocked up earlier. See how we use doubler plates, But this weighs 60 tons. Miller big blue 5oo. Nice machine. 20171126_070850.jpg
     
  16. Bonser Member

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    Location:
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    This is what it looks li 20171126_070800.jpg
     
  17. KimB

    KimB Member

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    I’m actually gonna be doing that today. Found the perfect bit of steel for the shackle to fit nicely between.

    Also, I’m sure I’ve seen them moved on the road. I think in the past metcalfe farms have moved them, can’t think who else I’ve seen move them though
     
  18. addjunkie

    addjunkie Member

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    Looks like a subsea valve manifold. presume that is on the deck of an ROV installation boat. Also suspect that cost a bit more then Kims truck
     
  19. MCKDAVID Member

    @addjunkie
    agreed, x 100 probably..... north sea yellow... dead giveaway eh.!

    although I think Kim's truck is better.. no disrespect to bonser though..
     
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  20. KimB

    KimB Member

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    They have been movies by trucks. I’ve seen it done a few times.
     
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