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NCCCO Re-certification time

Discussion in 'Cranes' started by catkicker, Dec 12, 2012.

  1. catkicker

    catkicker Well-Known Member

    Mar 19, 2009
    Crane Operator
    UGH! It's that time again, went to class last week and got all the new revised study material. Tests are this Saturday.
    Something that concerned me and why this did not get my attention before is beyond me. It is regarding (ASME B30.5-2007) 5-1.7.1 Rope design factors.
    My understanding of this is, even if my 4 parts of line gives me 67,200Lbs. The gross weight of a load even though it's within my capacity I could
    be in trouble with design factor minimums.

    design factor for running ropes SHALL not be less then 3.5 (rotation resistant 5 or greater)

    design factor calculation
    total minimum breaking strength of all ropes in system divided by load imposed on rope system when supporting static weights.
    Last edited: Dec 12, 2012
  2. Dustindlb

    Dustindlb Active Member

    Nov 9, 2012
    Truck crane operator
    Ugh... I gotta renew next month... Thanks for the refresher...