CT Crane Operator key terms

The requirement that an employer furnish a workplace free from recognized hazards likely to cause death or serious physical harm, even when no specific standard covers the hazard. For crane work it applies to hazards such as unstable ground or unmarked power lines.

A person capable of identifying existing and predictable hazards in the surroundings or working conditions and who has authority to take prompt corrective measures to eliminate them. Crane standards assign this person inspection, setup, and hazard-correction duties.

A person who, by possession of a recognized degree, certificate, or professional standing, or by extensive knowledge, training, and experience, has successfully demonstrated the ability to solve or resolve problems relating to the subject matter, the work, or the project.

The maximum load a crane, hoist, sling, or rigging component is designed to handle under stated conditions, as published by the manufacturer. It accounts for configuration, boom length, radius, and other limiting factors shown in the load chart.

A manufacturer-supplied table or graph showing the rated capacity of a crane for each combination of boom length, boom angle or radius, counterweight, outrigger condition, and quadrant of operation. The operator must know and follow the chart for the crane in use.

The horizontal distance from the center of rotation of the crane to the center of gravity of the load, measured with the boom in the working position. Capacity decreases as radius increases.

The total of the load weight plus the weight of all rigging, slings, shackles, and below-the-hook devices suspended from the hook. The load chart capacity must equal or exceed this total, not just the payload.

The product of a load and its horizontal distance from the tipping axis or center of rotation. Load moment indicators and limiters compare actual moment to the allowable moment to warn of overload and tipping conditions.

A device that senses boom length, angle, and load to compute the load moment and warn or stop operation when the crane approaches its rated capacity. It supplements, and does not replace, the operator's judgment and the load chart.

A sensing system that warns the operator and stops hoisting when the hook block or headache ball approaches the boom tip closely enough to contact it. Contact can break hoist ropes and drop the load.

An instrument that displays the angle of the boom relative to horizontal. Operators use it, together with boom length, to find the correct line in the load chart.

The angle between a sling leg and the horizontal load surface. As the angle flattens, tension in each leg rises sharply, so capacity must be reduced using the manufacturer's angle factor.

The force carried by an individual sling leg, which increases as the sling angle becomes shallower for the same load. It is calculated from the load weight, number of legs, and angle.

The maximum mass or force a rigging component is authorized to support in a specific rigging arrangement. It is marked on the component or published by the manufacturer and must never be exceeded.

A U-shaped connector with a pin or bolt used to join slings to loads or to crane hooks. The pin must be fully seated, and the shackle must be rated for the applied load and direction of pull.

Any lifting attachment that is not part of the crane, such as a spreader beam, lifting beam, or vacuum lifter, used between the hook and the load. It must be rated, marked, and inspected like other lifting gear.

A check of the crane and its components performed before each shift or use to find defects that could cause injury or damage. Items found defective must be corrected before the crane is placed in service.

A periodic inspection of crane components performed at intervals set by the manufacturer or standard, such as monthly to quarterly depending on service class. It covers items that wear or loosen with use.

A more thorough inspection of the crane conducted at longer intervals, typically annually, including disassembly or examination of components not visible during frequent inspections. Records of the inspection are kept.

Operation of the crane's controls and safety devices, such as limit switches, brakes, and warning signals, to confirm they work before lifting begins. It is performed without a load unless the procedure requires one.

The pressure a crane exerts on the soil or supporting surface through its outriggers, pads, or tracks. It must be compared with the soil's capacity, using mats or cribbing when needed to prevent settlement or tipping.

The pad or float attached to the bottom of an outrigger beam that spreads the crane's load over a larger area. It must be fully deployed and supported on stable material before lifting.

Blocks of wood, steel, or engineered mats placed under outrigger floats or tracks to spread load and level the crane. Cribbing must be sound, sized for the load, and arranged so it cannot shift or crush.

A defined set of arm and hand movements used to direct crane operations when voice or electronic communication is not used. Only one signal person should direct the operator at a time.

A person who relays directions to the crane operator using standard signals, radio, or other means. The signal person must be qualified, positioned with a clear view of the load and operator, and able to stop the lift.

A hand signal, voice command, or emergency stop that halts crane motion immediately. Any person may give it, and the operator must obey it regardless of who gives it.

The area swept by the rotating upper structure of the crane, including the counterweight, as it turns. The area must be barricaded or kept clear of personnel during operation.

A rope attached to a load to control rotation and swinging while it is hoisted. Tag lines keep workers from having to stand under or touch the load to steady it.

Measures taken to keep cranes, booms, and loads a safe distance from energized power lines, such as barriers, spotter, or de-energizing. The required clearance depends on line voltage and equipment type.

The closest distance a crane, boom, load, or rigging may come to an energized power line, set by voltage and by whether the equipment is insulated. It is the last line of defense against contact.

Connecting equipment to earth so that stray current from contact with an energized line flows safely to ground. Proper grounding and bonding protect workers from shock during crane operations near power lines.

The voltage difference between two points on the ground at different distances from a current source, which can shock a person standing nearby. Workers should shuffle or hop away from a downed line rather than stride.

Examination of hoist and boom ropes for broken wires, corrosion, kinks, birdcaging, and reduction in diameter. Ropes must be removed from service when damage exceeds the criteria set by the manufacturer or standard.

The rope that raises and lowers the load through the sheaves and hook block. It must be spooled correctly, free of damage, and matched to the crane's rated capacity.

Documentation of repairs, adjustments, and inspections performed on the crane and its components. Records support compliance with standards and help identify recurring defects.

A lift that exceeds a set percentage of the crane's rated capacity, involves personnel, or carries unusual risk, requiring a written lift plan and additional supervision. The plan defines the load, rigging, path, and contingencies.

A written document describing the load, crane configuration, rigging, path of travel, personnel roles, and hazards for a specific lift. It is prepared and reviewed before work begins.