Contents
- Stage 1: Pre-Lift Assessment
- Stage 2: Tool Selection
- Stage 3: Operator Role Assignment
- Stage 4: Engagement Verification
- Stage 5: Execution Sequence
- Stage 6: Communication Protocol
- Stage 7: Post-Landing Confirmation
- Stage 8: Documentation
- Boundaries of Magnetic Guidance
- Key Takeaways
- Frequently Asked Questions
- Related Articles
A guided suspended load operation — one where dedicated guidance tools keep the operator's hands outside the hazard zone throughout — does not happen by accident. It requires planning, the right equipment, a verified engagement, a clear execution sequence, and a communication protocol that allows four roles to coordinate in real time. This article provides a practical eight-stage framework that lifts that planning out of the abstract and into operational terms.
Stage 1: Pre-Lift Assessment
Before any tool is selected or any rigging is prepared, the guidance task itself must be understood. The pre-lift assessment answers eight questions:
Pre-Lift Assessment Checklist
Is the load ferrous? Magnetic push-pull guidance requires a ferrous load. A simple magnet test confirms this. If non-ferrous, plan for mechanical contact tools or taglines instead.
Is a viable flat engagement surface accessible? Identify the surface on the load where the magnetic head will be placed. Confirm it is accessible from a position outside the hazard zone.
What is the surface condition band? Assess whether the engagement surface is clean bare steel (Band 1), light paint/primer (Band 2), mill scale or thick coating (Band 3), or heavily corroded (Band 4). This determines the expected reduction from rated performance.
Where is the approximate centre of gravity? Anticipate how the load will hang. An off-centre CoG means the load will settle at an angle — identify this before the lift so the operator knows which correction will be needed.
What are the four hazard zones for this specific task? Identify the pinch points, crush zones, swing path arc, and line-of-fire direction for this load and this landing geometry.
What is the minimum handle length needed? Calculate the standoff required to keep the operator's hands outside the most constraining hazard zone at the most demanding moment of the task (typically the landing).
Is a tagline needed for the travel phase? If the lift involves significant horizontal crane travel, assess whether a tagline should be used during travel before transitioning to the magnetic tool for final positioning.
How many operators are needed? Assess whether the guidance task can be accomplished by one magnetic tool operator, or whether the load scale and complexity requires two.
Stage 2: Tool Selection
With the pre-lift assessment complete, tool selection follows from the answers:
| Selection Factor | Determines | PSC Range Reference |
|---|---|---|
| Minimum standoff distance required | Minimum handle length | MG001 (1ft) → MG008 (8ft), or MAG-FG-008 (4–8ft telescopic) |
| Operator movement during guidance (arc) | Head articulation requirement | Wide arc → 180° Swivel Head; predictable geometry → 90° Flex Head |
| Surface condition band | Head size and field verification requirement | Band 1–2: standard head; Band 3+: field verify; may need larger head or alternative method |
| Extended reach required | Fixed vs telescopic pole | MAG-FG-008 (telescopic fibreglass, 60mm/275lb head) for variable reach |
| Scale of rotation correction needed | Single operator or two-operator approach | One magnetic tool per operator; coordinate via pre-agreed signal |
Selecting the shortest handle "for convenience" is the most common selection error. The handle length is a safety specification, not a handling preference. The correct length is the one that keeps the operator's hands outside the hazard zone — determined by the task geometry, not by ease of carrying.
Stage 3: Operator Role Assignment
A guided suspended load operation involves four distinct roles. Each must be assigned to a named person before the lift begins, and each person must understand their specific function and the limits of their authority to act independently:
- Crane operator: Responsible for load support throughout. Controls vertical movement on signal from the banksman. Does not lower or travel independently during the guidance phase without a clear signal.
- Banksman / rigger: Responsible for rigging integrity, for relaying signals between the magnetic tool operator and the crane, and for monitoring load clearances during travel and descent.
- Tagline operator (if used): Responsible for swing control during crane travel. Maintains tension on the tagline during travel and holds position during final positioning until the magnetic tool operator has confirmed engagement.
- Magnetic tool operator: Responsible for close-range guidance during the final positioning phase. Confirms engagement before signalling crane to lower. Calls "hold" if an unexpected load movement occurs during descent. Steps back to confirm landing.
Stage 4: Engagement Verification
Before the lift begins, the magnetic tool operator engages the head on the actual load surface that will be used during guidance — in the position, orientation, and surface area that will be contacted during the task. This cannot be completed on a test piece, a different area of the load, or from memory of a previous similar load. The actual surface at the actual engagement point is the only valid verification.
The verification test: engage the head, apply a representative lateral push and pull force, and confirm the engagement holds consistently. Note any tendency to slip along the surface, to lift off at the edges, or to require unusually high force to initiate movement. If engagement feels weak or inconsistent relative to the task's requirements, reassess: a larger head, a different engagement point, or an alternative guidance method may be more appropriate.
Engagement verification confirms that the magnetic head couples to the surface at a given engagement point under static conditions. It does not confirm performance under dynamic conditions — when the load is moving, when the operator is repositioning, or when lateral forces are applied at an angle. Field verification provides a useful baseline; it does not replace the operator's ongoing assessment of engagement quality during the guidance sequence itself.
Stage 5: Execution Sequence
Crane positions load above landing zone
Crane travels load to destination. Tagline operator controls swing during travel if taglines are rigged. Load brought to near-rest above landing zone. Any significant residual swing resolved before magnetic tool operator approaches.
Magnetic tool operator approaches and engages
Operator approaches from outside swing path. Engages magnetic head on load face at pre-verified engagement point. Confirms hold. Signals banksman that engagement is confirmed and guidance is ready to begin.
Crane lowers — operator guides
On banksman signal, crane begins controlled lowering. Magnetic tool operator applies lateral, rotational, and positional corrections as the load descends. Operator hands remain at handle-length standoff. Crane bears the full load weight throughout; tool provides guidance force only.
Load approaches landing — maintain guidance through contact
As load approaches the landing surface, guidance continues. Operator does not close to the load edge or the landing surface. Handle length provides standoff above the closing pinch zone. Crane slows on approach to landing.
Load contacts surface — operator steps back — landing confirmed
As load contacts landing surface and weight begins to transfer, operator steps back. Progressive peel (90° Flex Head) disengages head naturally as operator moves away. Operator confirms "landed" to banksman. Crane maintains rigging tension until landing is confirmed stable.
Stage 6: Communication Protocol
Four people are coordinating a lift in real time, often across noise, distance, and restricted sight lines. Communication failures during the guidance phase are a leading cause of incidents. The communication protocol must be agreed before the lift begins and must be simple enough to be used reliably under the actual site conditions.
The protocol should specify: what signal means "lower" and what means "hold"; who has the authority to call a hold at any point (answer: any person in the crew can call hold, for any reason, and it must be obeyed immediately); how the magnetic tool operator signals engagement confirmed and landing confirmed to the banksman; and what happens if communication is lost — the default must be "hold."
Any crew member who sees or feels something unexpected during a guidance sequence has both the right and the responsibility to call a hold. No schedule pressure, no lift plan, and no seniority overrides this. The cost of an unnecessary hold is a short delay. The cost of overriding a hold call is potentially much higher.
Stage 7: Post-Landing Confirmation
Landing is not complete when the load first touches the surface. Post-landing confirmation requires three things before de-rigging can begin:
- Weight transfer confirmed. The load's weight has transferred fully to the landing surface or connection structure. The rigging is slack (for surface landings) or the connection bolt is seated (for structural connections).
- Load is stable. The load is not rocking, sliding, or tipping. It is seated stably on its intended support.
- All hands clear. All crew members are clear of all hazard zones before any attempt is made to de-rig or release the crane.
The crane and rigging must remain on the load until post-landing confirmation is complete. The magnetic tool's engagement does not provide load support — removing rigging while the magnetic head is still the only attachment to the load places the full load weight on a guidance instrument not designed or rated for load support. This is a critical misapplication and must not occur.
Stage 8: Documentation
For operations where guided lifts are a recurring activity, documentation of each lift creates a reference base for future tool selection and risk assessment. Useful records include: the load type and surface condition band observed; the head size and handle length used; whether engagement verification was performed and the result; any anomalies in engagement during the operation; the guidance method used; and any deviation from the planned approach.
This information accumulates into a practical knowledge base for the site or facility — reducing the pre-lift assessment time for recurring load types and providing evidence that systematic tool selection and engagement verification is being performed.
Boundaries of Magnetic Guidance
Non-ferrous loads. Magnetic guidance requires magnetic coupling. Non-ferrous loads cannot be guided with a magnetic tool. Select mechanical contact tools, hook tools, or taglines instead.
Insufficient or inaccessible flat engagement surface. If the load presents no viable flat engagement area accessible from outside the hazard zone, the prerequisites for magnetic guidance are not met.
Field verification shows inadequate engagement force. If the engagement verification test indicates that the guidance force available for this load and surface condition is insufficient for safe control of the expected load behaviour, do not proceed with magnetic guidance for this task. Reassess: different head, different method, different approach.
Tool deployment requires entering the hazard zone. If the only way to engage or disengage the magnetic head is to enter the pinch, crush, swing-path, or line-of-fire zone, the tool does not deliver its safety objective for this task. Find an alternative approach.
Handle length available cannot provide adequate standoff. If no handle in the available range is long enough to keep the operator's hands outside the hazard zone for this specific task geometry, magnetic guidance alone is not sufficient. Consider whether a longer handle, a different operator position, or an alternative guidance method addresses the standoff requirement.
Key Takeaways
- A guided suspended load operation requires systematic planning across eight stages: pre-lift assessment, tool selection, role assignment, engagement verification, execution sequence, communication protocol, post-landing confirmation, and documentation.
- Pre-lift assessment answers eight questions about the load, the hazard zones, the engagement surface, and the tool requirements before any equipment is selected.
- Handle length is selected from the minimum standoff requirement for the specific task geometry — not from handling convenience. Articulation is matched to actual operator movement range — not maximised by default.
- Engagement verification must be performed on the actual load surface at the actual engagement point before the lift begins. It cannot be substituted by product specification or experience with similar loads.
- Four roles — crane operator, banksman, tagline operator, and magnetic tool operator — each have distinct functions. All four must be assigned and briefed before the lift begins.
- Any crew member can call a hold at any point in the guidance sequence. The default response to lost communication is always hold.
- Post-landing confirmation requires weight transfer confirmed, load stable, and all hands clear before de-rigging. The crane and rigging must not be removed while the magnetic tool provides the only attachment to the load.
- Magnetic guidance has specific boundaries — non-ferrous loads, insufficient contact area, inadequate engagement force, and inaccessible engagement surfaces all require alternative guidance approaches.
Frequently Asked Questions
What should be confirmed during pre-lift assessment before using magnetic push-pull guidance?
The pre-lift assessment should confirm: the load is ferrous; a viable flat surface is accessible; the surface condition band has been identified; the load's CoG and expected settling angle are known; the four hazard zones have been mapped; the minimum handle length has been determined; the need for taglines during travel has been assessed; and the number of operators required has been confirmed.
Who should be involved in a guided suspended load operation?
Four roles: crane operator (load support and vertical movement), banksman/rigger (rigging integrity and communication relay), tagline operator if used (swing control during travel), and magnetic tool operator (close-range guidance during final positioning). Roles should be assigned and briefed before the lift begins.
What is the minimum acceptable handle length?
The length that keeps the operator's hands outside the most constraining hazard zone at the most demanding moment of the task — typically the final landing, when pinch and crush zones are smallest. This must be assessed for the specific task geometry; there is no single universal minimum.
At what point can the crane rigging be removed after a guided landing?
Only after post-landing confirmation is complete: weight transfer confirmed, load stable, and all hands clear. The magnetic tool's engagement does not provide load support — removing rigging while the magnetic head is the only attachment is a critical misapplication.
What should be documented after a guided lift?
Load type and surface condition band; head size and handle length used; engagement verification result; anomalies in engagement during the operation; guidance method used; any deviations from the planned approach.
What conditions mean magnetic push-pull guidance should not be used?
Non-ferrous load; no viable flat engagement surface accessible from outside the hazard zone; field verification shows insufficient engagement force; deploying or retrieving the tool requires entering the hazard zone; no available handle length provides adequate standoff for the task geometry.
Related Articles
This article synthesises the full series. The individual articles below provide the engineering detail behind each principle applied in this framework.
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