Operating a marine crane, offshore crane, or deck crane is far more complex and risky than land‑based lifting due to the harsh marine environment. Strict compliance with safety regulations and precautions not only extends equipment life but also directly protects crew and cargo. This article, featuring MAXTECH's design philosophy and smart technologies, outlines the key points.
1. Mandatory Pre‑Operation Checks
Before each shift, the operator must complete the following checks:
- Visual inspection – Check for cracks or deformation in steel structures, loose bolts, and hydraulic leaks.
- Wire rope condition – Look for broken wires, wear, and corrosion. MAXTECH’s MAX+Smarts system provides online wire rope monitoring to assess health in real time, but manual backup inspection is still necessary.
- Confirm WLL (Working Load Limit) – Based on the current working radius, consult the load chart to ensure the intended lift mass does not exceed the WLL at that radius. Overloading is strictly forbidden.
- LMI (Load Moment Indicator) self‑test – After power‑up, verify that the LMI functions correctly and displays data consistent with the load chart. MAXTECH’s LMI is integrated into the PLC with dual‑channel redundancy. If overload is detected, it automatically triggers audible/visual alarms and cuts off dangerous motions.
2. Key Safety Regulations During Operation
2.1 Strictly Adhere to WLL and LMI Limits
- WLL is an absolute red line – never exceed it. Remember that the same Crane has different WLLs at different radii (e.g., 35 t @ 6 m but only 8 t @ 20 m).
- LMI must always be active. Disabling or raising its threshold is prohibited. MAXTECH’s LMI has a self‑locking feature: once overloaded, the crane can only resume operation after a reset.
2.2 Compensate for Vessel Motion
- Vessels roll, pitch, and heave in waves. Try to operate during calm sea states. MAXTECH’s offShore Cranes can be equipped with dynamic heave compensation, using sensors to adjust the hook position in real time and minimise the effect of vessel motion on the load.
- Stop operation when heel exceeds 5° or trim exceeds 2° (unless the crane is designed for larger angles).
2.3 Anti‑Sway Operation
- Load swing can easily collide with nearby structures or personnel. MAXTECH’s anti‑sway system automatically adjusts hoisting, slewing and luffing speeds to keep swing within ±0.5°. For manual operation, avoid sudden starts or stops.
2.4 Communication and Signals
- Operator and signal person must use standard hand signals or two‑way radios. When the operator’s view is blocked, an additional signal person is required.
- Sound a warning horn before lifting to ensure all personnel have left the danger zone.
2.5 Wind Speed Limits
- General limits for Marine Cranes: working wind speed ≤ 20 m/s (about Beaufort force 7), parking wind speed ≤ 55 m/s. MAXTECH cranes come standard with an anemometer that displays and records wind speed; alarms trigger when limits are exceeded.
3. Special Operational Precautions
3.1 Grab Operation
- When using a grab for bulk cargo, the closing impact load may exceed the static WLL. MAXTECH’s grabs have optimised closing force curves, and MAX+Smarts can monitor impact cycles to prevent fatigue damage.
3.2 Spreader Operation
- When using a spreader to lift containers, ensure all twistlocks are fully engaged. MAXTECH spreaders can be fitted with twistlock status monitoring, with indicator lights in the cab showing the condition of each lock.
3.3 Explosion‑Proof Environments
- On oil tankers, chemical carriers or gas carriers, only explosion‑proof certified cranes may be used. MAXTECH offers ATEX/IECEx certified explosion‑proof deck cranes with fully sealed electrical components to prevent spark ignition.
3.4 Heavy Lifts (Near WLL)
- For lifts approaching the WLL (e.g., >80 % of WLL), perform a trial lift: raise the load 0.5 m above deck, hold for 5 minutes, and observe the LMI reading and any structural abnormalities.
4. Maintenance and Periodic Inspection
- Daily maintenance – Lubricate the slewing bearing and wire ropes according to the manual, and clean electrical cabinets. MAXTECH offers a centralised lubrication option that automatically greases critical points.
- Periodic inspection – Load tests must be carried out every 12 months by a classification society or authorised agency. MAXTECH can assist in arranging inspections and provide original factory test reports.
- Wire rope replacement – Replace the rope when the number of broken wires reaches the limit or the diameter is reduced by more than 7 %. MAX+Smarts records cumulative working hours and recommends the optimal replacement time.
5. How MAXTECH Improves Operational Safety
| Feature | Benefit |
|---|---|
| MAX+Smarts AI monitoring | Real‑time monitoring of wire ropes, slewing bearing, and LMI status – early warning of issues |
| Anti‑sway control | Automatically eliminates load swing, reducing collision risk |
| Dynamic heave compensation | Compensates for vessel heave to keep the hook steady |
| Explosion‑proof design | Certified for Zone 1/Zone 2 hazardous areas |
| Remote diagnostics | Shore‑based experts view real‑time data to assist troubleshooting |
| Full class certification | BV, ABS, CCS, NK, LR, API‑2C – ensuring design compliance |
Summary
Safe operation of a marine crane is no small matter. Every operator must remember that WLL and LMI are two lifelines, and strictly follow wind/wave limits, communication procedures, and maintenance schedules. Choosing a manufacturer like MAXTECH that focuses on smart safety technology can significantly reduce human error and make every lift worry‑free.
For operation manuals or safety training materials specific to your crane model, please contact MAXTECH technical support.
Post time: Apr-22-2026
