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Thread: Oh dear, someone failed to do the last check

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    Default Oh dear, someone failed to do the last check

    A new 5000 ton crane failed it's load test.
    Rgds
    J.A.
    https://gcaptain.com/demes-game-chan...eid=3b737aa316

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    Default Re: Oh dear, someone failed to do the last check

    It would appear there is a weak spot about half way along the jib.
    Pity about that!!
    Happy daze John in Oz.

    Life is too short to blend in.

    John Strange R737787
    World Traveller

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    Default Re: Oh dear, someone failed to do the last check

    She doesn't appear to be lifting anything.
    Vic

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    Default Re: Oh dear, someone failed to do the last check

    #3 Not anymore!

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    Default Re: Oh dear, someone failed to do the last check

    Seeing that failure of the strict tests put on the likes of heavy gear before being issued with safety certificates reminds me of the tests of other parts, wires were tested to destruction to test their breaking strain. Or at least a sample of the wire used to be, and the SWL was approx. 1/3 of the breaking strain or maybe 1/6 as memory not too good. Vic you being an electrician maybe know how they tested electric towing winches to evaluate them for bollard pull. I never seen it done but assumed they put the wire ashore to a fixed point and heaved away until the winch cut out , the winch having a stress meter on, is this about right ? The earlier towing winches were about 80 tons , today would imagine they would be in the 200 tons bollard pull range.
    Cheers JS
    Last edited by j.sabourn; 9th May 2020 at 10:08 AM.

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    Default Re: Oh dear, someone failed to do the last check

    #2 ..Hope the safety man made sure they were all wearing hard hats. JS

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    Default Re: Oh dear, someone failed to do the last check

    Latest on the failure is that the hook failed at half the load which seems strange as it's the jib that collapsed in half.
    Any and all tests are only really valid on the date and time of the actual test and is really only a guide to be used in future, hence swl is, as JS said, 1/3 of test load, or 75%.
    Rgds
    J.A.

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    Default Re: Oh dear, someone failed to do the last check

    Quote Originally Posted by happy daze john in oz View Post
    It would appear there is a weak spot about half way along the jib.
    Pity about that!!
    yep, scrap prices are very low just now.

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    Default Re: Oh dear, someone failed to do the last check

    I was in a building yard in 2005, in a meeting with project managers when the door bursts open and the messenger gabbles out "they bent the crane jib"

    Seems they were testing the crane and when lifting the jib they kept hoisting waiting for the limit switches to operate.
    Turns out they weren't wired in.

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    Default Re: Oh dear, someone failed to do the last check

    That’s why there will always be accidents. Although emphasis is always put on human failure to adhere to the rules , sometimes those rules are often not enough e.g. a few wires on a strand have gone, and the old rule if it was. Less than 5 % of the strand it was still safe to work with. The human eye cannot be 100 % in seeing other broken wires , then you had wires with 12, 24, and 37 wires to a strand , this would have different meanings to different people instead of one rule covering all. Today wires are unlike most we sailed with as are designed for special jobs as for flexiibilty. And other requirements. The old formulaes probably no longer suffice and we all rely on machines to keep us in the picture , so a disaster may depend on a 10 amp fuse wire. JS.
    A good example of only fools and horses was in most backward ports the stevedores saw 10 t SWL stencilled on a Derrick and proceeded to load 10 tons on a Union purchase. The 10 t SWL signifies that the Derrick has been tested to that lift on a single lift by the one Derrick. This would in any case be much reduced with a Union purchase. JS.
    Last edited by j.sabourn; 9th May 2020 at 10:55 AM.

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