The thought of an OSHA Compliance Office visiting a construction site may make some cringe.
OSHA released a ‘directive for enforcing requirements of the Cranes and Derricks in Construction standard.’ The purpose of the directive is to give OSHA personnel a basis on how to conduct their inspections at construction sites when equipment covered by Subpart CC are present.
The items outlined below are just the minimum a Compliance Office follows during their inspection. The officer can include items in the inspection from other applicable requirements if the reason for the inspection is a fatality, compliant/referral inspection, or if a hazardous condition is present.
- Are ground conditions adequate, including support/foundation, matting, cribbing, blocking, etc?
- Is there visibly apparent need for repairs of equipment?
- Are nearby power lines energized; what is the voltage; what is the crane’s working area; and what are the encroachment prevention procedures?
- Is a signal person used and do they have documentation of qualification, electronic or physical?
- Is the qualified signal person the one communicating with the operator?
- Are lift plans being followed, if used?
- If hoisting personnel, who determined it was necessary?
- Are meetings being conducting for working near power lines, A/D work or hoisting?
- Is all available rigging equipment compliant?
- Are load charts and OEM manual’s available for the specific equipment used?
- Is the operator qualified, trained and competent?
- Are equipment and wire rope inspections being conducted; by whom; and are they qualified?
- Are safety devices and operational aids functioning?
- Are there any visual deficiencies of hoisting equipment, components and load line?
- How is weight of load determined?
- Are qualified riggers being used for A/D work and when in the fall zone?
- Who is the A/D Director and are they present?
- Are oilers and mechanics qualified; are they communicating with the operator; and are...
Something went terribly wrong while three cranes were moving the bow section of a ship in a Mississippi shipyard. One crane overturned and several workers injured.
Cranes are designed to smoothly lift and move loads within their capacity with the boom tip directly over the center of gravity of the crane’s load. When multiple cranes are working together, they share the load, but neither have the load positioned over the center of gravity.
As you can imagine, things become more complicated when three cranes are working in tandem, because the movement of a load has to be perfectly choreographed. In this case, the only safe maneuvers made would be to hoist, lower and travel. Hoisting and lowering shouldn’t be a problem as long as each crane’s share of the load is within its capacity. However, traveling induces dynamic forces on the cranes because they don’t travel in perfect synchronization. Like all equipment, cranes travel at random speeds no matter how careful the operators are to synchronize their speed. Being off by a small amount causes what could best be described as a pushing and shoving match between the cranes.
Industry accepted lift planning models for multiple crane lifts would require that no crane be loaded beyond 75% of capacity. This 25% safety margin is used to compensate for the dynamic forces.
Attend our Mobile Crane Operator training to learn safe operating practices.
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