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Rigging Hazard Awareness. Between the trolley hook and the load is RIGGING Ropes, Slings, Chains Slings inspected daily Proper storage when not in use Suitable protection of rigging when in use (items with sharp corners, etc..). Rules for Rigging Safety. Know the weight of the load

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rigging hazard awareness
Rigging Hazard Awareness
  • Between the trolley hook and the load is RIGGING
  • Ropes, Slings, Chains
  • Slings inspected daily
  • Proper storage when not in use
  • Suitable protection of rigging when in use (items with sharp corners, etc..)
rules for rigging safety
Rules for Rigging Safety
  • Know the weight of the load
  • Know the center of gravity of the load.
  • Make load attachment above the center of gravity of the load.
  • Select hitch that will hold and control.
  • Know the rated capacity of slings and hardware.
rules for rigging safety3
Rules for Rigging Safety
  • Select sling best suited for load.
  • Inspect all rigging before the lift.
  • Protect sling from sharp surfaces
  • Proper calculation of increased tension caused by sling angles (on all rigging components!).
rules for rigging safety4
Rules for Rigging Safety
  • Allow for D/d ratio on all wire rope slings.
  • Calculate reductions when using choker hitch.
  • Keep personnel clear from lift area.
  • Lift load a few inches then check rigging
  • Know limitations of all lifting devices used.
  • Lift slowly and stop slowly
rigging equipment for material handling
Rigging equipment for material handling
  • Rigging equipment inspections (By a Competent Person)
    • Prior to use on each shift
    • As necessary during its use to ensure that it is safe
    • Defective rigging equipment removed from service
  • Not be loaded in excess of its recommended safe working load
rigging equipment for material handling6
Rigging equipment for material handling
  • Custom design grabs, hooks, clamps, or other lifting accessories, for such units as modular panels, prefabricated structures and similar materials
    • Marked to indicate the safe working loads
    • Be proof-tested prior to use to 125 percent of their rated load
rigging equipment for material handling7
Rigging equipment for material handling
  • Alloy steel chains
  • Welded alloy steel chain slings
    • Permanently affixed durable identification stating
      • Size
      • Grade
      • Rated capacity
      • Sling manufacturer
rigging equipment for material handling8
Rigging equipment for material handling
  • Alloy steel chains
  • Job or shop hooks and links, or makeshift fasteners, formed from bolts, rods, etc., or other such attachments, shall not be used
rigging equipment for material handling9

G 80

Rigging equipment for material handling
  • Four grades:
    • Grade 28 General Utility Chain
    • Grade 43 High Test Chain
    • Grade 70 Binding Chain
    • Grade 80 Alloy Steel Chain: The only one used for overhead lifting
rigging equipment for material handling10
Rigging equipment for material handling
  • Alloy steel chains
  • Inspections
    • Frequent
      • Visual examination by the user
  • Periodic
    • Complete link by link inspection of the entire sling and all attachments.
    • Documented
rigging equipment for material handling11
Rigging equipment for material handling
  • Alloy steel chains
  • CP inspections made & based on
    • Frequency of sling use;
    • Severity of service conditions;
    • Nature of lifts being made; and
    • Experience gained on the service life of slings used in similar circumstances.
  • Such inspections at least once a year
  • Documented & available
rigging equipment for material handling12
Rigging equipment for material handling
  • Wire rope slings
  • Protruding ends of strands in splices on slings and bridles covered or blunted
  • Wire rope shall not be secured by knots
  • Except for eye splices in the ends of wires and for endless rope slings, each wire rope used in hoisting or lowering, or in pulling loads, shall consist of one continuous piece without knot or splice
rigging equipment for material handling16
Rigging equipment for material handling

Illegal Pig Tail

Mechanical Splice

rigging equipment for material handling17
Rigging equipment for material handling
  • Wire rope slings
  • Shall not be shortened with knots or bolts or other makeshift devices.
  • Legs shall not be kinked
  • Basket hitch shall have the loads balanced to prevent slippage
  • Padded or protected from the sharp edges
rigging equipment for material handling18
Rigging equipment for material handling
  • Wire rope
  • Hands or fingers shall not be placed between the sling and its load while the sling is being tightened around the load
  • A sling shall not be pulled from under a load when the load is resting on the sling
rigging equipment for material handling19
Rigging equipment for material handling

D

d

D/d Ratio

D - is diameter around which sling is bent.

d - is diameter of the sling.

rigging equipment for material handling20
Rigging equipment for material handling
  • When U-bolt wire rope clips used to form eyes
    • U-bolt shall be applied so that the "U" section is in contact with the dead end of the rope
  • “Never saddle a dead horse”
rigging equipment for material handling21
Rigging equipment for material handling
  • Synthetic webbing (nylon, polyester, and polypropylene).
    • The employer shall have each synthetic web sling marked or coded to show
      • Name or trademark of manufacturer
      • Rated capacities for the type of hitch
      • Type of material
  • Rated capacity shall not be exceeded
rigging equipment for material handling22
Rigging equipment for material handling
  • Synthetic webbing (nylon, polyester, and polypropylene)
  • Remove from service immediately if:
    • Acid or caustic burns
    • Melting or charring of any

part of the sling surface

    • Snags, punctures, tears

or cuts

    • Broken or worn stitches
    • Distortion of fittings
rigging equipment for material handling23
Rigging equipment for material handling
  • Shackles and hooks
    • Manufacturers’ identification
    • Never weld on hooks or shackles
    • Working safety latch on hooks
rigging equipment for material handling24
Rigging equipment for material handling

Not Recommended

Recommended

Recommended

Round Pin Anchor Shackle

Bolt Type Anchor Shackle

Screw Pin Anchor Shackle

rigging equipment for material handling25
Rigging equipment for material handling

Never replace a shackle pin with a bolt.

The load will bend the bolt.

rigging equipment for material handling26
Rigging equipment for material handling

Proper chocking of shackles.

Avoid eccentric loads.

Bad

Good

Bad

Good

rigging equipment for material handling27
Rigging equipment for material handling

Check cracks, bending and twisting

Check wear

Check wear and straightness

Pin always seated

Check opening width

rigging equipment for material handling28
Rigging equipment for material handling

LOAD

Hooks are designed to apply the load at the bottom of the saddle.

rigging equipment for material handling29
Rigging equipment for material handling

Check for Wear and Deformation

Signs of “Opening Up”

Check for Cracks and Twisting

15%

10º

Check that Hook is Not Twisted

Check for Wear and Cracks

rigging equipment for material handling31
Rigging equipment for material handling

Approximately 70%-80% of a straight pull

rigging equipment for material handling32
Rigging equipment for material handling

90° basket hitch is approximately twice the capacity of a straight pull

how horizontal angle affects slings capacity
How horizontal angle affects slings capacity

1000 LBS

1000 LBS

577 LBS

577 LBS

500 LBS

500 LBS

707 LBS

707 LBS

1000 LBS

1000 LBS

1000 LBS

1000 LBS

60°

90

30°

45°

Note: A good operating practice is to keep sling angles from going below 60 degrees

rigging equipment for material handling34
Rigging equipment for material handling
  • Calculating the load on sling legs
    • Divide the total load by the number of sling legs
    • This quotient is the load on each leg if vertical
    • Measure the sling from the load attachment point, to the point where it connects with the hook or lifting device; this is ‘L’
    • Measure the vertical height from the top of the load to the hook or lifting device; this is ‘H’
    • Divide the length of the leg by the height of the sling
slide35

L

H

LOAD

Load  Number of legs) X (L  H) = Load each sling leg

slide36

Example

  • Load = 120,000 pounds
  • 4 load legs ÷ 120,000 equals 30,000 pounds each leg if vertical hitch
  • Sling legs are 20 feet
  • Height from top of load to lifting device is 15 feet
  • 20 ÷ 15 = 1.33
  • Load on each leg is 1.33 x 30,000 = 40,000 pounds

20'

15'

120,000 lb.

slide37

Center of Gravity

  • A load is stable when:
    • The hook is directly above the center of gravity of the load
  • Estimate the center of gravity
  • Lift the load just enough to clear the ground
  • If the hook is not over the center of gravity the hook will travel to the center of gravity

CG?

slide38

Center of Gravity

  • If necessary, set the load down and adjust the rigging
  • If the load tips more than 3°, the rigging should be adjusted
  • The longer the sling legs, the more stable the load will be

B

The longer set of sling legs (B) will improve load stability

A

disposal of waste materials
Disposal of waste materials
  • Materials are dropped more than 20 feet to any point lying outside the exterior walls of the building
    • enclosed chute
disposal of waste materials42
Disposal of waste materials
  • Debris dropped through holes in the floor without the use of chutes
    • Completely enclosed with barricades not less than 42 inches high
    • Not less than 6 feet back from the projected edge of the opening above
    • Signs warning of falling materials shall be posted at each level
    • Removal shall not be permitted in this lower area until debris handling ceases above
disposal of waste materials43
Disposal of waste materials
  • Scrap lumber, waste material, and rubbish
    • Removed from the immediate work area as the work progresses.
  • Disposal of waste material or debris by burning
    • Comply with local fire regulations
  • All solvent waste, oily rags, and flammable liquids
    • Kept in fire resistant covered containers until removed from worksite