[RIGGER’S CORNER]
TRAINING IS ESSENTIAL for Proper Selection of Rigging Hardware
BY DANNY BISHOP CORPORATE DIRECTOR OF VALUE ADDED TRAINING THE CROSBY GROUP, LLC
that the correct size and type of rigging hardware is selected for the application.
P Before selecting the hardware there are a few useful tips to consider:
1. T e rigging hardware selected must have working load limits (W.L.L.) that exceed the total load imposed on the hardware.
2. T e rigging hardware in contact with wire rope sling eyes preferably have diameters greater than the diameter of the wire rope. Per the wire rope technical board the pin diameter should never be smaller than the sling body diameter. T ey also state that the pin diameter should not be any greater than the natural width of the sling eye.
3. If eye bolts are used they must be shouldered eye bolts if subjected to angular loading. T ey must be installed correctly.
4. If hoist rings are used they must be properly installed which includes using a torque wrench to apply correct torque value.
5. T e rigging hardware at the load connections will see the same load as the slings.
6. Proper inspection prior to lifting is essential.
In order to properly determine correct size and type of hardware, the competent rigger should have received training on a minimum of the following topics, prior to the lift.
• How to calculate load weight • How to determine location of center of gravity • How to calculate sling tension • How to select proper rigging hardware and slings
Knowledge of ASME, OSHA and manufacturer recommendations is essential as well. ASME B30.26 “Rigging Hardware” and ASME B30.9 “Slings” standard requires users of rigging hardware and slings to be trained on proper selection, inspection, cautions to personnel, eff ects of environment and rigging practices.
These are just a few of the main things that should be considered,
Let’s begin with the load to be lifted:
roper selection of rigging hardware for overhead lifting applications requires proper training in order to insure
HR-125 60°
5 Tons (10,000#) (FIGURE A)
60° (OPTIONAL)
Figure “A”: The load to be lifted has center of gravity in the middle between the pick points. The horizontal sling angle is 60 degrees. Total load to be lifted equals 10,000 or 5 tons. The wire rope slings to be used are 9/16” diameter (EIP) (IWRC).
Continues on page 80. > WIRE ROPE EXCHANGE MAY-JUNE 2012 79
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