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Thread: Proof Test Interval for Conveyor Holdbacks/backstops

  1. #1
    ajithkocheril Guest

    Proof Test Interval for Conveyor Holdbacks/backstops

    Hi all,

    I’m based in Queensland, Australia. Australian standards requires the designer to specify a proof test interval for conveyor backstops ( mandatory). Just wondering if any one can share the procedure and frequency of this test?

    The standards also recommend monitoring wear and effective operation of holdbacks. However, I have not come across any proven methods for achieving this. Please provide some info in this regard too.

    *We use dual backstops mounted on an intermediate shaft inside gearbox.

    Thanks
    Ajith

  2. #2
    Teus Tuinenburg

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    Dear Ajit,

    Have the Australian standards not described the specification for a proof test interval for conveyor backstops ( mandatory)?

    If they have not, then they can reject any test.
    Teus

  3. 1. I cannot share,
    1a. Regarding the frequency, perhaps a FEMA is a practicable option.
    2. For low speed holdbacks, I am aware of: load testing, and measurement [i.e. "strain gauge"].
    I am aware of a minimum of two off low speed holdback manufacturers, that retail in Australia, that have a position regarding this matter.
    Perhaps the following is off topic, however generally speaking, according to me: if holdbacks are required, the holdbacks must be low speed.

    Regards,
    Lyle

  4. #4

    Some backstops just don't work.

    It seems like this Australian standard might have been written for Ireland.
    Seriously though: it is not specific & therefore not acceptable as a standard. (Which is also the Brexiteers' view)
    To test you need to bring a fully laden conveyor to rest; check the brake is on; uncouple the motor & release the brake.
    If the conveyor doesn't run back then the sprag is working.
    Its not rocket science: unless you want to find somewhere to bond a strain gauge into the workings & then calculate....what?
    The standards recommendation to monitor wear & operation is covered in my 3rd sentence except for my ignoring 'effective' because either it slips or doesn't slip (effectively writing)
    Holset used to make a gradual release holdback to release the locked in tension after a stall (NCB rules after a fatality). So please remember to make sure nobody is in a place of danger when you do your test.
    John Gateley
    johngateley@hotmail.com
    www.the-credible-bulk.com

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