What Goes Into a Crane Lift Plan

Why a lift plan is more than a capacity check

A common misconception is that lift planning simply means checking whether a crane’s rated capacity exceeds the weight of the load. Capacity at the working radius is only one link in the chain. Ground that gives way under an outrigger, rigging at a shallow angle, a boom that meets an obstruction, or a misunderstood signal can each cause an incident on a lift that was well within chart capacity.

A complete lift plan documents how the entire system behaves: the crane configuration, the load and its rigging, the ground beneath the pads, the surrounding site geometry, and the people responsible for executing each stage.

Core components every crane lift plan must include

Codes and regulations such as BS 7121 in the UK, and ASME B30.5 and OSHA 29 CFR 1926 Subpart CC in the US, set expectations for how lifting operations are planned and who is responsible. A thorough lift plan typically covers the following:

1. 1. Load data and center of gravity — Gross load weight including all components, exact dimensions, center of gravity (especially on asymmetric loads), lift points, and any internal liquid movement or dynamic behaviour.
2. 2. Rigging tackle and deductions — Weight of the hook block, headache ball, slings, shackles, spreader beams and lifting beams, plus anything else the chart notes require you to deduct. The plan must state sling angles (measured from horizontal), rated sling capacities, and the resulting leg tensions.
3. 3. Crane configuration and geometry — Crane make, model, counterweight package, outrigger spread (full, intermediate, or retracted), boom length, boom angle, jib length/offset, operating radius, and maximum tip height required for the pick, swing, and set positions.
4. 4. Capacity utilization and safety margins — Rated chart capacity at the maximum pick and place radii, total gross weight (net load + all deductions), and percentage of crane capacity utilized. Many companies and sites set their own utilisation limit, above which a lift is treated as critical and needs extra review.
5. 5. Ground conditions and outrigger reactions — Maximum point load on each outrigger pad or track, allowable ground bearing pressure confirmed by geotechnical report or site investigation, and specified crane mat dimensions and material ratings.
6. 6. Clearances, obstacles, and exclusion zones — Minimum clearances to buildings, overhead power lines, blind corners, and swing-tail radius. Physical barricading and exclusion zones beneath the load path and counterweight tail-swing area.
7. 7. Environmental limits and emergency procedures — Maximum allowable in-service wind speed (for both crane and sail area of load), lightning/gust protocol, ground slope limits, and abort criteria.
8. 8. Named personnel and formal sign-offs — Identified Appointed Person / Lift Planner, Crane Operator, Rigging Supervisor / Slinger, and Site Engineer, with dates and sign-off signatures indicating the plan has been reviewed and briefed.

How lifts are categorised

BS 7121-1 expects the level of planning to match the complexity of the lift, and UK practice commonly groups lifts as basic, standard or complex. Organisations word these categories differently — some add an intermediate category — so follow your own procedures. The table shows the typical pattern.

Spreadsheets vs. Dedicated lifting plan software

Many planners still work from hand sketches and spreadsheets. A spreadsheet handles arithmetic well, but it has limits on site:

Step-by-step: How to build a professional lift plan

1. Step 1: Gather verified load and site data — Confirm the certified weight from a shipping manifest or load cell. Measure the load envelope and locate lift lugs. Inspect the site for underground utilities, excavations, ground bearing capacity, and overhead hazards.
2. Step 2: Position the crane and determine radii — Determine the crane setup location that minimizes working radius while maintaining required tail-swing and outrigger clearance. Measure the initial pick radius and the final placement radius.
3. Step 3: Select crane configuration and calculate deductions — Choose the appropriate boom length, counterweight, and outrigger spread. Add the hook block weight, headache ball, slings, and rigging hardware to the net load weight to calculate the total gross load.
4. Step 4: Check capacity and calculate sling tensions — Confirm that total gross load is within the crane’s rated capacity at the worst-case radius. Calculate sling leg tensions with Tension = Load ÷ (Load-bearing legs × sin θ), counting no more than two legs for three- and four-leg slings.
5. Step 5: Verify outrigger pad pressure and mat sizing — Obtain the maximum single-leg outrigger reaction from manufacturer data or verified engineering charts. Divide reaction force by mat area to confirm ground bearing pressure is below the site allowable limit.
6. Step 6: Brief the crew and execute sign-off — Review the completed plan during the pre-lift toolbox talk with the operator, riggers, signal person, and lift director. All parties verify that site conditions match the plan before work commences.

What lifting plan software cannot do

• It cannot verify whether the ground has unmapped voids, sinkholes, or soft backfill beneath the surface.
• It cannot replace an on-site physical inspection of slings, shackles, and rigging hardware for wear, cracks, or deformation.
• It cannot approve a lift or replace the authority of a qualified crane operator or appointed person to stop the job if conditions change.

Software is a planning and verification tool designed to eliminate calculation and spatial errors. The final responsibility for safe execution always rests with the competent persons on site.

Common questions