Red Seal Tower Crane Operator flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Fall arrest tie-off rule

Above the walking/working surface, a full body harness is anchored to a designated point; 100% tie-off means the new connection is made before the old one is released.

Hierarchy of hazard control

Ranked from most to least effective: elimination, substitution, engineering controls, administrative controls, and personal protective equipment as the last line of defence.

Limit approach distance

The minimum permitted distance between any part of the crane or load and an energized power line, set by the authority having jurisdiction and increasing with line voltage.

Manufacturer wind limit

The maximum wind speed at which the crane may operate in a given configuration; free-standing, tied-in, and erection configurations each have different limits.

Bridle sling leg tension

Tension per leg equals half the load divided by the cosine of the leg angle from vertical; wider included angles increase tension and reduce usable capacity.

Sling angle capacity factors

Multipliers on single-leg vertical capacity: 1.00 at 90 degrees, 0.866 at 60, 0.707 at 45, and 0.500 at 30 degrees from horizontal.

Gross load definition

The total suspended mass: payload plus rigging, slings, shackles, spreader beam, and hook block; load moment limiters are set against gross load.

Center of gravity placement

The hoist line must be directly above the combined center of gravity of load and rigging so the load hangs level without rotation or unequal leg loading.

Free-standing height limit

The maximum mast height permitted without structural ties, stated by the manufacturer; exceeding it requires ties designed for calculated forces.

Climbing configuration balance

The jib, counter-jib, and counterweight positions specified for the climbing operation; the crane is not used for lifting while climbing.

Torque and pin control

Structural bolts are tightened to the manual value with a calibrated wrench and marked; pins use specified retainers; substituted hardware is a stop-work condition.

Configuration record

Documented jib length, counterweight, tie levels, rope falls, and hook block; the load chart in the cab must match this as-built configuration.

Wire rope rejection criteria

Common thresholds include six or more randomly distributed broken wires in one lay, or three or more in one strand in one lay; confirm against the applicable standard.

Limit switch function test

Before each shift, test hoist high and low limits, trolley limits, and the moment limiter; a defeated or bypassed limiter is a stop-work condition.

Brake hold test

Lift the load slightly, stop, and confirm the brake holds with no drift before making the pick; report drift, noise, or overheating.

Fault isolation sequence

Stop, secure the load, isolate power, verify the symptom, consult the manual and fault codes, and repair only within your authorization and competence.

Rated capacity variables

Capacity depends on radius, jib length, counterweight, and configuration; it decreases as radius increases and never exceeds the chart for the current setup.

Side loading prohibition

Do not drag, pull, or side-load with the hoist; the crane is not used to pull stuck loads or drag loads along the ground.

Slew load lag control

A suspended load lags behind the slew; lead it with the trolley, keep it close to the mast, and start and stop slewing gradually to limit pendulum swing.

End-of-shift parking

Land the load, raise the hook to the specified height, place the trolley at the specified position, set the slewing brake, and leave the crane in the specified storm position.

Radius measurement

Measured horizontally from the slewing center to the center of the hook or load, not along the jib; trolley position and swing change the true radius.

Ground bearing check

The base must be supported by a foundation or mat designed for maximum overturning moment plus crane weight, with soil capacity verified and voids identified.

Tail-swing clearance

The minimum clear distance the counter-jib sweeps through the full slew circle, checked against buildings, scaffolding, and adjacent structures.

Overhead hazard mapping

Locating power lines, towers, and adjacent cranes on the site plan, marking limits with barriers or goalposts, and including them in the lift plan.

Emergency stop signal

Both arms extended horizontally with palms down, moved back and forth; it must be obeyed when given by anyone on site, not only the designated signal person.

Radio communication protocol

Identify crane and signal person, use short clear phrases on a dedicated channel, confirm each command, and stop and hold if radio contact is lost.

Single signal person rule

Only one designated signal person controls a lift; transferring control to another person is formally acknowledged by the operator before it takes effect.

Pre-lift meeting content

Review of lift plan, load weight, rigging, path, signals, roles, exclusion zone, and emergency stop; all participants confirm understanding before the lift.

Operator certification

The credential required by the jurisdiction, such as a Red Seal Tower Crane Operator endorsement in Canada, kept current and carried on site.

Critical lift plan

A written plan for tandem, blind, near-capacity, or hazardous lifts, signed by the competent person, with load calculations, rigging, radius, and responsibilities.

Incident reporting duty

Report immediately, preserve the scene, record statements and conditions, and cooperate with the investigation; do not alter equipment before examination.

Manufacturer manual authority

A controlling document for configuration, load charts, wind limits, torque values, and maintenance intervals; deviations require documented engineering approval.