NCCCO Crane Inspector key terms

The maximum load a crane may lift under a specific configuration, including boom length, radius, and counterweight, as published by the manufacturer in the load chart.

The manufacturer-supplied table or diagram that lists allowable capacities for each combination of boom length, radius, and other configuration variables. Inspectors verify it is present, legible, and matches the crane.

The horizontal distance from the crane's center of rotation to the center of gravity of the suspended load. Capacity decreases as radius increases, so accurate measurement is essential.

The angle of the boom measured from horizontal. It determines working radius and capacity, and is read from the boom angle indicator during inspection and operation.

The total weight being handled, comprising the load, rigging, hook block, and any other suspended attachments. Rated capacities are compared against gross load, not just the payload.

Weights subtracted from the published capacity for items not included in the load chart figures, such as hook block, slings, jib, or auxiliary lifting devices. Inspectors confirm operators account for them.

A safety device that prevents the hook block from contacting the boom tip by stopping hoisting or boom lowering when the two come too close. Its function must be verified during inspection.

An operator aid that senses load and boom geometry and warns or stops operation when capacity is approached or exceeded. Inspectors check calibration, display, and alarm function.

Devices that assist the operator in monitoring crane status, including load moment indicators, boom angle indicators, radius indicators, and level indicators. They supplement but do not replace the load chart.

An instrument mounted on the boom that displays its angle above horizontal. Inspectors verify it is present, readable, and reasonably accurate against a measured reference.

A device that stops or restricts a crane motion at a preset point, such as hoist upper limit or boom lower limit. Function is tested during periodic inspection.

The pattern in which strands are wound around the core, such as regular lay or lang lay. Lay affects inspection criteria and the meaning of broken wire counts.

The distance along a rope in which one strand makes a complete helical turn around the core. Broken wire removal criteria are often stated per lay length.

The number of broken wires found in a specified length of rope, used against removal criteria. Counts are typically evaluated per lay length and across the rope diameter.

Published conditions that require a wire rope to be replaced, such as broken wire counts, diameter reduction, corrosion, kinking, or heat damage. Inspectors apply them during rope inspection.

A systematic examination of running and standing ropes for broken wires, wear, corrosion, distortion, and end connections. Results are recorded and compared to removal criteria.

Loss of groove profile or diameter on a sheave that can damage rope and affect reeving geometry. Inspectors check groove condition and compare sheave diameter to rope diameter.

The path and number of rope parts running between boom tip sheaves and the hook block. Incorrect reeving changes load distribution and is verified against the manufacturer's instructions.

The assembly of hook, sheaves, and weight that carries the load and provides parts of line. Inspectors check hook throat opening, wear, latch function, and sheave condition.

A spring-loaded device that closes the hook throat to prevent slings from slipping off. Inspectors verify it is present, undamaged, and closes freely.

The inside distance across the hook at its narrowest point. Excessive opening from deformation or wear is a removal criterion for the hook.

The slings, shackles, hardware, and attachments used to connect the load to the hook. Inspectors check identification, condition, and configuration against the lift plan.

The angle between a sling leg and the horizontal, which determines the tension in each leg. Lower angles increase leg tension and reduce usable capacity.

The maximum load a sling may carry in a given configuration, adjusted for angle, number of legs, and hitch type. Inspectors verify markings and configuration match the lift.

A U-shaped connector with a pin used to join slings and hardware. Inspectors check for markings, pin security, wear, cracks, and deformation.

An extendable beam and float that widens the crane's support base and transfers load to the ground. Inspectors check extension, pinning, float condition, and pad bearing.

The pressure exerted through outrigger floats or crawler tracks onto the supporting surface. Inspectors verify mats, cribbing, and soil conditions are adequate for the planned lift.

The condition of the crane being set horizontal within the manufacturer's tolerance. Level status affects capacity and is verified with the level indicator before lifting.

A bubble or electronic device on the crane that shows whether the machine is level. Inspectors confirm it is present, intact, and readable.

The check performed before each shift or use, covering fluids, safety devices, controls, ropes, and visible structural condition. Results are documented and deficiencies addressed before operation.

A more thorough inspection performed at defined intervals based on crane type, use, and manufacturer or regulatory requirements. It covers items not practical to check daily.

An inspection interval category for equipment in regular service, falling between daily checks and periodic inspections. Items and frequency depend on severity of use and applicable standards.

A condition found during inspection that does not meet requirements and must be corrected or evaluated before continued use. Serious deficiencies require removal from service.

The act of taking a crane or component out of operation because a deficiency makes continued use unsafe. The item is tagged, secured, and reported until repaired and re-inspected.

Documentation of inspection date, inspector, items checked, findings, and corrective actions. Records support compliance verification and maintenance history tracking.

A controlled test applying a specified load to verify crane or lifting equipment strength and function. It is performed under defined procedures and documented with results.

A test load, usually a percentage above rated capacity, applied to verify structural and mechanical integrity. It is not the same as a working load and is used only under controlled test conditions.

A function check of crane motions, brakes, and safety devices without necessarily applying a test load. It confirms controls and limits operate as intended.

A documented description of a lift including load weight, rigging, crane position, capacity analysis, and responsibilities. Inspectors confirm the plan matches actual site conditions.

A lift that warrants additional planning and oversight, such as near capacity, over occupied areas, or involving multiple cranes. It typically requires a written plan and specific approvals.