LF week 3

Card Set Information

LF week 3
2013-12-19 01:05:22
LF week

Show Answers:

  1. what are snatch blocks used for
    redirect a rope in many different rigging situations
  2. what 5 defects should snatch blocks be inspected for before each use
    • hook and safety latch
    • locking pin, pivot pin, and swivel
    • shell
    • center pin
    • sheave
  3. where will snatch blocks typically have their weight ratings stamped
    on the hook or shell
  4. always read the ____ ______ and calculate the _______ involved in a rigging application before using the block
    weight rating, tensions
  5. when the angle of the rope through the block decreases, the tension on the block
  6. when is friction created on a rope
    when it passes through the sheave on a block
  7. what is the amount of tension on a snatch block dependent upon
    the angle of the rope that passes through the block
  8. where should snatch blocks placed while rigging transmission structrues
    strong points
  9. eff of eye splice
  10. eff of short splice
  11. eff of bowline
  12. eff of clove hitch
  13. eff of square knot
  14. eff or knots that choke
  15. name the 7 components of a snatch block
    hook, safety latch, shell, sheave, center pin, locking pin, pivot pin
  16. snatch block tension =
    line out times angle factor
  17. explain how tensions on a snatch block are created
    the angle a rope passes through a block
  18. what is the formula that is used to determine what the line out force will be after a rope passes through a block
    line in times 1.1 = line out
  19. when would you use parted blocks to hang an overhead transformer
    when trucks can't access a pole
  20. what should hook and safety latch be inspected for
    bent hook, defective safety latch, excessive wear at all contact points, metal fatigue, rust
  21. what should locking pin, pivot pin, and swivel be inspected for
    metal fatigue, rust, and excessive wear, swivel operates freely, lubricate if recommended
  22. what should the shell be inspected for
    cracks and breaks and sharp edges that can damage rope
  23. what should center pin be inspected for
    tightly seated or secured
  24. what should sheave be inspected for
    turns freely, check for excessive wear on the bearings by moving the sheave up and down, check for cracks and sharp edges that can cut rope