Why it matters

A crane accident is rarely small. A toppled mobile crane or a dropped precast panel can kill several people at once and close a site for weeks.

The causes are well known. The load was heavier than anyone thought, or the ground under an outrigger gave way. A sling was damaged or rigged at the wrong angle. Someone walked under the load. Signals got crossed between the operator and the ground.

Every one of these is a planning or supervision failure. That is where you come in.

The lifting crew

Each person on the lift has a defined job. They must be trained for it and easy to pick out on site. The Code of Practice on Safe Lifting Operations calls for reflective vests or other clear markings. Riggers and signalmen must, by law, be dressed so they stand out as riggers and signalmen.

  • Lifting supervisor. Appointed before any crane lift. Coordinates the lift, briefs the crew on the lifting plan, checks the ground and stays present throughout. Needs an approved course and at least 1 year of lifting experience.
  • Crane operator. Tests limit and indicator devices at the start of each shift and logs the results. Checks the ground and outriggers. Lifts only after a briefing and a clear signal.
  • Rigger. Checks slings and gear, finds out the load weight and tells the operator. Rigs the load so it is secure and balanced. Puts loose items in a proper container and pads sharp edges.
  • Signalman. Confirms with the rigger that the load is properly rigged. Gives clear signals and keeps sight of the load.
Anyone can stop the lift

The code of practice says every crew member should be empowered to stop work if the lift becomes unsafe. Tell your crew that, and back them when they do it.

Order of controls

  • Eliminate. Can the item be delivered closer, assembled in place, or moved without a lift?
  • Substitute. Choose a crane with spare capacity at the working radius, not one at its limit.
  • Engineer. Outrigger mats, load moment indicators, limit switches, receptacles for loose items, and physical barriers around the lift zone.
  • Administer. Lifting plan, permit-to-work, crew briefing, exclusion zones, weather limits and a test lift.
  • Personal protection. Helmets, gloves and high-visibility vests. These do not protect anyone from a dropped load. Distance does.

The lifting plan

The law requires a lifting plan for any crane lift. Routine lifts can use a basic plan backed by an on-site risk assessment and a briefing. Heavy, tandem or complex lifts need more engineering work.

The lifting supervisor owns the plan and shares it with the crew. Review it, and pause the lift, whenever something changes. Changes include a different crane or configuration, new rigging, changes to the site, a change in the weather, or a new key person.

  • Load weight, gross and net, with dimensions and lifting points
  • Crane type, position, radius and rated capacity at that radius
  • Rigging gear and sling arrangement
  • Ground conditions and outrigger set-up
  • Exclusion zone, travel path and landing area
  • Crew names, roles and how they will communicate
  • Weather limits and emergency procedures

Equipment and lifting gear

Lifting gear includes chains, ropes, slings, hooks and shackles. Before first use, an Authorised Examiner must test and examine each item and issue a certificate stating its safe working load. The examiner then gives it a thorough examination at least once a year. The same applies to cranes and other lifting machines. Cranes must show their safe working load and an ID number.

Check gear before each lift. Reject slings with cuts, broken wires, kinks, crushing, heat damage or missing tags. Never load any item beyond its safe working load. Only an examiner or inspector may do that, for a test.

Only an approved crane contractor may install, repair, alter or dismantle a mobile or tower crane. After any of that work, an Authorised Examiner must test and certify the crane before it lifts again.

Before and during the lift

  • Check the ground. Fully extend and secure outriggers on firm mats.
  • Know the weight. If you cannot find out the weight, do not lift.
  • Keep the crane at least 3 metres from any live overhead power line.
  • Barricade the lift zone and keep everyone out from under the load.
  • Do a test lift: raise the load just clear of the ground, stop and watch for movement or strain.
  • Use tag lines to control the load. Do not grab a moving load by hand.
  • Do not drag or side-pull loads with the crane.
  • Stop the lift if the wind rises past the maker's limit, or if lightning or heavy rain comes in.
  • Never swing a load over a public road or area unless it has been cordoned off.

What the rules require (Singapore)

The main laws are the WSH (Operation of Cranes) Regulations 2011 and the WSH (General Provisions) Regulations. On worksites, the WSH (Construction) Regulations 2007 add a permit-to-work. The Code of Practice on Safe Lifting Operations in the Workplaces sets out good practice.

  • Lifting plan for every crane lift, available to an inspector (Cranes Regs reg 4).
  • Registered crane operator for mobile cranes over 5 tonnes SWL and tower cranes (reg 5). Approved training for mini cranes up to 5 tonnes and lorry loaders (reg 5A).
  • Operator duties, including shift-start tests, the 3-metre power line rule and no dragging (reg 16).
  • Appointed lifting supervisor for any crane lift; appointed rigger and signalman for mobile and tower crane lifts (regs 17 to 19).
  • Approved crane contractor for installing, repairing, altering or dismantling mobile and tower cranes (reg 20).
  • Authorised Examiner certificate before use and thorough examination at least yearly for lifting gear, appliances and machines (General Provisions Regs regs 20 and 21). Keep a register (reg 22).
  • No one under 18 may operate a powered lifting machine or give signals to its operator (General Provisions Regs reg 21).
  • Permit-to-work for lifts using tower, mobile or crawler cranes on construction worksites (Construction Regs regs 10 and 11).
  • Register cranes, hoists and lifting gear with MOM through an Authorised Examiner (MOM).
Penalties

Breaking most Operation of Cranes rules, including the lifting plan and crew appointments, can bring a fine of up to $50,000, up to 2 years in jail, or both (reg 28).

Common mistakes

  • Guessing the load weight from the delivery note or by eye.
  • Outriggers half extended, or set on soft fill without mats.
  • Workers standing under or beside a suspended load to guide it by hand.
  • Riggers giving signals while also handling the load.
  • Uncertified or damaged slings pulled from the back of a lorry.
  • Loose bricks or tiles lifted on a pallet without a cage or net.
  • Carrying on after the plan changed, with no review.
One signalman, one voice

Mixed signals from several people confuse the operator. Agree who gives signals before the lift starts. Everyone else stays quiet unless they are calling a stop.

Use it on site: the lifting & cranes checklist and the toolbox talk to brief your crew.

Sources

  1. Workplace Safety and Health (Operation of Cranes) Regulations 2011, Singapore Statutes Online (AGC).
  2. Workplace Safety and Health (General Provisions) Regulations, Singapore Statutes Online (AGC).
  3. Workplace Safety and Health (Construction) Regulations 2007, Singapore Statutes Online (AGC).
  4. Code of Practice on Safe Lifting Operations in the Workplaces, WSH Council.
  5. Register lifting equipment, Ministry of Manpower.
  6. Code of practice on safety and health in construction (revised 2022), International Labour Organization.

This is practical guidance, not legal advice. Laws and codes of practice change; always check the current official text and your site's own procedures.