CSCS Mobile Crane key terms

A lift that exceeds a set threshold of risk, such as exceeding 75 percent of a crane's rated capacity, using multiple cranes, or lifting over occupied structures, requiring a written lift plan and added supervision.

A documented description of a specific lift that identifies the load, crane, rigging, personnel, hazards, and step-by-step procedure, prepared and reviewed before work begins.

The force per unit area that a crane's outrigger or track imposes on the supporting surface, which must be compared against the soil's verified capacity to prevent settlement or tipping.

A pad or mat placed under an outrigger to spread the crane's reaction force over a larger area, reducing ground bearing pressure and improving stability on softer surfaces.

The process of positioning and adjusting a crane so its upper structure and carrier are within the manufacturer's specified tolerance, verified with an indicator before any lift is made.

The process of connecting telescopic or lattice boom sections, inserting pins, and attaching the boom to the crane per the manufacturer's instructions before the crane is placed in service.

A manufacturer-supplied table or graph that states the maximum allowable load for a given boom length, radius, boom angle, and configuration under specified conditions.

The maximum load a crane may lift in a specific configuration and condition as stated in the load chart, before deductions for rigging and other attachments.

The load chart capacity remaining after subtracting the weight of all rigging, hooks, blocks, and attachments from the gross capacity, representing the maximum weight of the actual load.

The total weight being lifted, including the load itself plus all rigging, slings, shackles, hooks, and any other components suspended below the boom tip.

The horizontal distance from the crane's center of rotation to the vertical centerline of the suspended load, measured with the boom under load and used to read the load chart.

The angle between the boom centerline and the horizontal, used together with boom length to determine load radius and to check the load chart.

The weight subtracted from a load chart's gross capacity for items such as the hook block, headache ball, slings, and jib, yielding the allowable load weight.

The angle formed between a sling leg and the horizontal, which determines the tension in each leg; shallower angles increase leg tension and reduce the assembly's working capacity.

The force carried by an individual sling leg, calculated from the load weight and the sling angle, used to select slings and hardware with adequate rated capacity.

A U-shaped connector with a pin or bolt used to join slings to loads or hooks, marked with its working load limit and matched to the load and sling size.

Components such as shackles, hooks, links, and swivels used to connect slings and loads, each carrying a manufacturer's working load limit that must not be exceeded.

The maximum load a rigging component, sling, or attachment is designed to carry under normal service conditions, as marked by the manufacturer or stated in its documentation.

The point at which a load's weight is considered concentrated; a load must be rigged so this point is directly below the hook to avoid tilting or uncontrolled rotation.

A rope attached to a load and controlled by a worker to prevent rotation and swinging while the load is hoisted, moved, and landed.

A defined set of arm and hand movements used by the signalperson to direct crane operators, covering hoist, lower, boom, swing, stop, and emergency stop commands.

A qualified person who directs the crane operator using standard signals and who is responsible for relaying instructions clearly and stopping operations when conditions become unsafe.

A distinctive signal, commonly both arms extended horizontally with palms down and moved rapidly side to side, used to halt all crane motion immediately in any situation.

The operator's management of hoist, boom, and swing motions to keep the load stable, prevent swinging or shock loading, and place it accurately at the intended location.

A device that slows or stops rotation of the crane's upper structure, used to control load swing and to hold position against wind or slope.

A safety system that detects when the hook block approaches the boom tip and stops hoisting and boom lowering to prevent contact and rope damage.

An instrument that measures boom length, angle, and load to calculate the crane's capacity utilization and warn or stop operation before the rated capacity is exceeded.

A documented check of the crane and its safety devices performed before each shift or use, covering fluid levels, wire rope, hooks, brakes, and warning systems.

Examination of hoist rope for broken wires, corrosion, kinking, and wear against removal criteria, performed at intervals set by the manufacturer and applicable standards.

A more thorough inspection of the crane performed at defined intervals by a qualified person, covering structural components, mechanisms, and safety devices in greater depth than a pre-operation check.

A documented test applying a specified test load to verify a crane's capacity and function after major repair, alteration, or as required by regulation, before returning it to service.

The minimum distance that must be maintained between any part of the crane, load, or rigging and energized electrical lines, as established by the applicable standard for the voltage involved.

A marked area around the crane's swing radius and lift path that keeps unauthorized personnel clear of moving equipment, suspended loads, and potential drop zones.

Predetermined actions for events such as power line contact, fire, tip-over, or loss of load control, including stopping operations, securing the area, and notifying emergency services.

The maximum wind velocity, specified by the manufacturer or the lift plan, above which crane operations must stop because load control and stability can no longer be assured.

Contact between the hook block and the boom tip that can snap the hoist rope or damage the boom, prevented by the anti-two-block device and careful hoist operation.

A person who, by possession of a recognized degree, certificate, or professional standing, or by extensive knowledge and experience, can successfully perform the assigned task and resolve related problems.

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.