Lifting a machine that weighs several tonnes is the single most dangerous moment in most relocation projects. A dropped load can destroy irreplaceable equipment, damage the building, and injure people in seconds. Yet many failed lifts are not caused by exotic problems — they come from a missing weight figure, an unknown center of gravity, or a sling angle nobody calculated. This guide explains how professional teams build a rigging and lift plan that removes guesswork from heavy machinery relocation.

Why a Written Lift Plan Matters

A lift plan is a controlled document that describes exactly how a load will be picked, moved and set down. It forces the team to answer the hard questions before the crane arrives, not while a machine hangs in the air. For anything heavy, awkward or high-value, an improvised lift is unacceptable.

A good lift plan protects you in three ways:

Safety — every hazard is identified and mitigated before work starts.
Equipment protection — attachment points and load paths are chosen to avoid distortion or damage.
Accountability — roles, sign-offs and inspection records are clear if something is questioned later.

For complex or tandem lifts, the plan should be prepared or verified by a competent rigging engineer or appointed person.

Step 1: Establish the Real Weight

Everything downstream depends on an accurate weight. Never trust a rough estimate for a critical lift.

Reliable sources include:

The machine nameplate or original technical documentation.
Manufacturer drawings and datasheets.
Direct weighing with calibrated load cells or a crane scale.

Remember that the shipping weight in a manual may exclude fluids, tooling, dies, product residue or later add-ons. Add a sensible allowance for these, plus the weight of the rigging gear itself (spreader beams, slings, shackles). This total is what the crane must handle.

Step 2: Find the Center of Gravity

Machines are rarely symmetrical. A motor on one side, a heavy gearbox at the base, or a tall control column all shift the center of gravity (CoG). If you rig around the geometric center instead of the true CoG, the load will tilt the moment it leaves the ground.

Ways to determine the CoG:

Use manufacturer data where it is provided.
Do a controlled test lift: raise the load a few centimeters and observe how it hangs, then adjust sling lengths or hook position.
For unusual shapes, calculate it from known sub-assembly weights.

Rig so the hook sits directly above the CoG. The goal is a load that lifts level and stays stable.

Step 3: Choose Attachment Points

Wrong pick points bend frames, crack castings and shear brackets. Prefer engineered lifting points wherever possible:

Certified lifting eyes, lugs or tapped holes specified by the manufacturer.
Structural members strong enough to carry the load without deforming.

If no dedicated points exist, a competent person must decide where slings can safely bear against the structure — never around fragile guards, pipework, cabling or sheet-metal covers. Use softeners or protective packing to prevent slings from cutting into edges and to protect painted or machined surfaces.

Step 4: Select the Right Rigging Gear

Every item in the lifting chain must be rated for the load and in date for inspection.

Key factors:

Working Load Limit (WLL): the rated capacity of each sling, shackle, hook and beam must exceed the share of the load it carries, with the correct safety factor.
Sling angle: as slings spread wider from vertical, the tension in each leg rises sharply. Angles below 45 degrees from horizontal put dangerous loads into slings and pick points. Keep angles as steep as practical.
Spreader and lifting beams: use these to keep slings vertical, control crushing forces on the machine, and manage the CoG on long or wide loads.
Chain vs. round slings: chain is robust against sharp edges and heat; synthetic round slings are gentler on finished surfaces but must be protected from cutting.

Inspect every component before use and reject anything damaged, worn or without valid certification.

Step 5: Select and Position the Crane

Crane selection is not just about maximum capacity. What matters is the capacity at the required radius and boom configuration, read from the manufacturer's load chart. A crane rated for 100 tonnes may safely lift only a fraction of that at a long reach.

Consider:

Lift radius, height and any obstructions in the swing path.
Ground bearing pressure under outriggers — cribbing or steel mats spread the load and prevent the crane from sinking or tipping.
Indoor constraints: headroom, door widths, floor loading and whether an overhead travelling crane can be used instead of a mobile crane.
Wind limits and weather, especially for tall or large-surface loads.

Always build in a margin. Running a crane close to 100% of its chart in real conditions leaves no room for error.

Step 6: Plan the Load Path and Landing

Map the full journey of the load from pick-up to set-down. Identify pinch points, live services overhead, and the exclusion zone that must be kept clear of people. Plan where the machine will land and confirm the receiving surface — foundation, temporary cribbing or transport trailer — is ready and level.

For precise sets, tag lines let ground crew control rotation without standing under the load. Nobody should ever be beneath a suspended machine.

Step 7: Communication and Roles

Assign clear roles before the lift:

Appointed person / lift supervisor — owns the plan and stops work if conditions change.
Crane operator — controls the crane and acts only on agreed signals.
Slinger / signaller — attaches the load and directs movement.
Riggers and spotters — manage tag lines and watch clearances.

Agree on hand signals or radio protocol in advance, and confirm that only one person gives signals to the operator at a time. A short toolbox talk immediately before the lift keeps everyone aligned.

Common Mistakes to Avoid

Guessing the weight instead of confirming it.
Ignoring the true center of gravity and skipping the test lift.
Wrapping slings around fragile covers, pipes or cables.
Using excessive sling angles that overload legs and pick points.
Reading crane capacity from the headline figure, not the load chart at radius.
Leaving people inside the exclusion zone.

The Bottom Line

A safe lift is an engineered event, not an act of strength. When you confirm the weight, locate the center of gravity, choose rated gear, size the crane at the real radius and rehearse the load path, the physical lift becomes almost anticlimactic — which is exactly the goal. In machinery relocation, the quiet, boring lift is the successful one. Investing the hours to plan it properly is far cheaper than replacing a dropped machine or explaining an avoidable accident.

Rigging & Lift Plans for Safe Heavy Machinery Relocation