crane rigging. © business & legal reports, inc. 0907 understand the basics of crane operations...

Crane Rigging

http://www.blr.com/

© Business & Legal Reports, Inc. 0907

Understand the basics of crane operations

Choose the correct sling or rigging hardware

Inspect rigging hardware

Rig a load correctly

Session Objectives


• 29 CFR 1910.179, 1910.180, 1910.184,1926.550

• ANSI/ASME

• API RP 2D

• 29 CFR 1910.179, 1910.180, 1910.184,1926.550

• ANSI/ASME

• API RP 2D

Crane Standards


Types of Cranes• Mobile

• Telescopic

• Tower

• Gantry/Overhead

• Vessel


• Weight of Load

• Rated Capacity

• Boom Height/Length/Angle

• Load Chart and Lift Radius


Essential Data


• Sling or hardware rating

• Reduced angle means less capacity

• Crane hardware rating

Rigging Hardware Data• Sling or hardware rating

• Reduced angle means less capacity

• Crane hardware rating


• Sling angle

• Center of gravity

• Sharp corners

• Load under control

• Tag line

• Obstructions

• Personnel out of the way

• Weather

• Sling angle

• Center of gravity

• Sharp corners

• Load under control

• Tag line

• Obstructions

• Personnel out of the way

• Weather

Serious Questions


Why Not Just Wing It?


Sling Selection

• Rated capacity

• Material composition

• Size, design, and configuration

• Condition

• Tags



• Strong

• Fit shape of load

• Tolerate high temperatures

• Damaged by shocks

• Watch for damage

• Strong

• Fit shape of load

• Tolerate high temperatures

• Damaged by shocks

• Watch for damage

Chain Slings


• Composed of strands of wire rope

• May have fiber core

• Can experience cracking or kinking

• Composed of strands of wire rope

• May have fiber core

• Can experience cracking or kinking

Wire Rope Slings


Rope Lay• Right lay

• Left lay


Rope Lay (cont.)

• Regular lay

• Lang lay


• Strength

• Flexibility

• Durability

• Strength

• Flexibility

• Durability

Wire Rope Sling Selection


• Similar to chain mail

• Fits shape of load

• For basket or choke hitches

• Similar to chain mail

• Fits shape of load

• For basket or choke hitches

Wire or Metal Mesh Slings


• For lighter loads

• Protect surface of load

• Susceptible to deterioration

• Stretch when wet

• Must be inspected thoroughly











Fiber Rope Slings


• Nylon, Dacron, or polyester

• Contour to fit the load

• Durable and resistant to degradation

• Nylon, Dacron, or polyester

• Contour to fit the load

• Durable and resistant to degradation

Synthetic Web Slings


Which Sling Is It?Match the sling name to the description

Chain

Wire Rope

Metal Mesh

Fiber Rope

Synthetic Web

Lay is important

For heavy or hot loads

Unlikely to biodegrade

For light loads only

Similar to chain mail


Questions?• Basic crane operations

• Rated capacity and load charts

• Slings and sling selection


Check for:

Excessive wear

Distortion or stretching

Corrosion

Heat stress

Chemical damage

Check for:

Excessive wear

Distortion or stretching

Corrosion

Heat stress

Chemical damage

Sling Inspection


Chain Sling Inspection• Check inside ends and outside edges

• Excessive stretching is unsafe

• Watch for binding



Wire Rope Sling Inspection

• Cracking and pitting

• Kinking

• Deformation

• Rust

• Heat stress

• Broken wires

• Damaged fittings



Fiber Rope Sling Inspection• Dry, discolored fibers

• Powder or dust from internal wear

• Fibers that come apart



• Holes, snags, tears

• Broken or worn stitching

• Heat stress and burns

Synthetic Web Sling Inspection



Sling Maintenance• Keep it clean

• Repair may be possible

• Lubricate wire rope slings

• Store safely


• Inspect with care

• Never use equipment with parts malfunctioning or missing

• Inspect with care

• Never use equipment with parts malfunctioning

or missing

Shackles, Clips, Eyes, and Other Hardware


• A safety latch is essential

• Bent hooks must be retired

• A safety latch is essential

• Bent hooks must be retired

Hooks


Hitches• Single vertical

• Bridal hitch

• Basket hitch

• Choker hitch

Learn with experience!


Preparing the Lift• Personal protective equipment

(PPE)

• Hook and line over load

• Lines not kinked or twisted



Preparing the Lift (cont.)

• “Rig up the load”

• Hook latch closed

• Path clear

• Lift tested



Crane Signals


The “Nevers”

• Use a twisted line

• Lift by the block hook

• Use unsafe equipment

• Allow an unsafe lift

Never


• Use more than one signalman

• Work under a suspended load

• Turn your back on a lift

The “Nevers” (cont.)

Never


A type of hitch in which two slings meet at the crane hook is a _____ ____.

An essential part of the crane hook that keeps the sling from sliding off is a ____ or ___.

A term for describing the pattern of wires in a wire rope is ___.

The maximum weight a crane or sling will support is _____ _______.

What Is?(Fill in the blanks)

bridle hitch

clip

lay

rated capacity

latch


Questions or Comments?


Key Points to Remember!

Takes years of practice

Is always interesting

Learn all you can

Be cautious; think safety

Routine lifts can be deadly

crane rigging. © business & legal reports, inc. 0907 understand the basics of crane operations...

Documents