CSCS Self-Erect Crane flashcards
CSCS Self-Erect Crane · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- LOLER examination interval
- Lifting equipment must receive a thorough examination before first use, after erection, after exceptional circumstances, and at intervals not exceeding six months.
- PUWER 1998 scope
- Work equipment must be suitable, maintained, inspected, and used only by competent persons; this applies to cranes regardless of ownership or hire.
- Competent person definition
- A person with the competence, training, and experience to carry out the specific task, such as thorough examination, as distinct from the appointed person who plans lifts.
- RIDDOR reporting
- Dangerous occurrences such as crane collapse or uncontrolled release of a load must be reported to the enforcing authority under the Reporting of Injuries, Diseases and Dangerous Occurrences Regulations.
- Self-erect crane definition
- A tower crane designed for rapid erection without a separate mobile crane, typically using a folding mast and jib and its own climbing or jacking mechanism.
- Moment limiter function
- A safety device that measures load moment and cuts out hoisting or derricking when rated capacity is exceeded, protecting the crane from overload.
- Two-blocking
- Contact between the hook block and the jib or trolley, prevented by the upper hoist limit switch; causes include operator error or limit switch failure.
- Slew lock purpose
- A device that prevents rotation of the upper structure; applied during erection, dismantling, climbing, and in certain out-of-service conditions per the manufacturer.
- Ground bearing pressure
- The pressure imposed by the crane's base or outriggers on the ground, which must be less than the soil's bearing capacity with an adequate factor of safety.
- Zone of influence
- The area around the crane, including buried services, drains, basements, and voids, that could be affected by the crane's loads and must be surveyed before siting.
- Out-of-service condition
- The defined configuration for a crane not in use, such as slew lock or free-to-slew, with the jib positioned to minimise wind area per the manufacturer.
- Over-sail hazard
- The risk of the jib or load passing over adjacent property, structures, or public areas outside the site boundary, requiring assessment and control.
- Climbing frame
- The crane's own mechanism used to jack the mast and insert new sections; climbing is a reduced-stability operation with strict wind and exclusion controls.
- Erection method statement
- A written, site-specific document describing the sequence, personnel, equipment, and controls for erecting or dismantling the crane, supervised by a competent person.
- Post-erection examination
- A thorough examination by a competent person required after erection or climbing and before the crane is returned to service.
- Dismantling risk
- Dismantling is statistically the higher-risk phase; it requires the same planning, supervision, and exclusion controls as erection, often in more constrained conditions.
- Load moment formula
- Load moment equals load multiplied by radius, including hook block and sling effects; the rated capacity must not be exceeded at any radius.
- Gross load calculation
- Gross load equals the net load plus lifting accessories plus hook block; lifting calculations must always use gross load, not the net weight.
- Rated capacity curve
- The relationship showing that rated capacity decreases as radius increases, specific to jib length, counterweight, and base configuration.
- Wind load proportionality
- Wind load on the load and jib increases with exposed area and with the square of wind speed; the chart's in-service wind limit must be respected.
- Sling leg tension
- For a two-leg sling, tension per leg equals half the load divided by the cosine of the angle from vertical; flatter angles increase leg tension.
- SWL versus WLL
- Safe working load and working load limit denote the maximum rated load for an accessory; the assembly rating is limited by its weakest component.
- Tag line use
- A rope attached to the load to control rotation and swing during lifting, keeping personnel clear of the load's path.
- Hook safety latch
- A spring-loaded device on the hook that prevents the sling or load from slipping off; it must be present and functional before use.
- Designated signaller
- The single person appointed to direct the lift by hand or radio signals; only this person gives signals, except anyone may give an emergency stop.
- Emergency stop signal
- A signal that any person may give at any time; the operator must stop immediately on receiving it or on loss of communication.
- Radio communication test
- Before a lift, the dedicated radio channel must be tested and a backup hand-signal method agreed in case communication fails.
- Wire rope rejection criteria
- Reject wire rope for excessive broken wires per lay length, corrosion, kinks, bird-caging, or damaged end terminations, per manufacturer criteria.
- Brake test requirement
- Hoist and slew brakes must be verified to hold the rated load, tested before each shift where practicable and after any adjustment.
- Limit switch function test
- Upper and lower hoist, trolley, and slew limit switches must be tested and operating correctly; the operator must never rely on stopping the load manually.
- In-service wind limit
- The maximum wind speed at which the crane may lift, specified by the manufacturer; lifting must stop and the crane put out-of-service when reached.
- Emergency load lowering
- A procedure to lower a suspended load safely if power fails, using the crane's emergency lowering system, briefed to the operator before operations.