When the signalman desires to give the operator any instructions other than those provided by the established signal system, the operator should be instructed to stop all motion FIRST.
Hand signals can be used effectively when the distance between the operator and the signalman is not great, but two-way radios should be used when the distance or atmospheric conditions prevent clear visibility. Adequate lighting and signalling arrangements must be available during night work, and the equipment must not be operated when either is inadequate.
The most important rigging precaution is to determine the weight of all loads before attempting to lift them, to make ample allowances for unknown factors, and to determine the available capacity of the equipment being used. In cases where the assessment of load weight is difficult, safe load indicators or weighing devices should be fitted. This chapter also includes a section dealing with the estimation of load weights.
It is equally important to rig the load so that it is stable. Unless the center of gravity of the load is below the hook, the load will shift.
The safety of personnel involved in rigging and hoisting operations largely depends upon care and common sense. Remember these safe practices.
Know the safe working load of the equipment and tackle being used. Never exceed this limit.
Determine the load weight before rigging it.
Examine all hardware, equipment, tackle, and slings before using them and survey defective components. Discarded equipment may be used by someone not aware of the hazards or defects.
Never can-y out any rigging or hoisting operation when the weather conditions are such that hazards to personnel, property, or the public are created. You must carefully examine the size and shape of the loads being lifted to determine if a hazard exists during high wind speeds. Avoid handling loads that have large wind- catching surfaces that could cause loss of control of the load during high or gusty winds. The wind can critically affect the loading and load-landing operation and the safety of the personnel involved (fig. 1-16).
Figure 1-16. - Wind effects on load.Continue Reading