Heavy Lifting

Heavy lifting services encompass the planning, engineering, and execution of lifts that exceed the capacity of standard rigging operations. When loads reach tens, hundreds, or thousands of tons, standard mobile cranes and conventional rigging methods give way to specialized equipment and engineered solutions. The applicable planning, personnel, and documentation requirements depend on the equipment, type of work, governing rules, contract, and site procedures.

What Makes a Lift “Heavy”

The term “heavy lift” has no single regulatory definition. In practice, it describes work that needs more planning, engineering, or specialized equipment than a routine lift because of the load, site, or consequences of failure. Loads requiring multiple cranes, engineered rigging attachments, or non-standard lifting systems such as gantries and strand jacks often fall into heavy-lift territory.

Heavy lifting can involve loads weighing tens, hundreds, or thousands of tons, but there is no universal starting tonnage. The defining characteristic is not weight alone; it is the planning, equipment, and engineering rigor required to execute the lift safely. Smaller loads may still need industrial rigging specialists when access, geometry, or placement tolerances make the work complex.

Heavy Lift Methods and Equipment

Each heavy lift method is suited to specific load characteristics, site conditions, and project constraints. Selecting the right approach is an engineering decision that balances capacity, precision, schedule, and cost.

Hydraulic Gantry Systems

Hydraulic gantries governed by ASME B30.1 (Jacks, Industrial Rollers, Air Casters, and Hydraulic Gantries) are the workhorse of indoor and confined-space heavy lifting. Individual gantry legs range from 75 to over 1,000 tons capacity, and multi-leg configurations can handle combined loads of several thousand tons. Gantries lift, travel, and place loads within tight footprints — making them essential for manufacturing plant installations, power generation equipment, and retrofit projects where crane access is limited.

Strand Jacks

Strand jacks lift loads by pulling high-strength steel strands through hydraulic cylinders, achieving capacities from 100 to over 5,000 tons per unit. Multiple strand jacks can be synchronized for lifts exceeding 10,000 tons. This method is common in petrochemical plant construction (setting reactor vessels, columns, and heat exchangers), bridge construction (incremental launching and segment lifting), and offshore platform module installation.

Jack-and-Slide Systems

Jack-and-slide combines vertical hydraulic jacking with horizontal skidding on PTFE (Teflon) slide paths. This method positions heavy loads laterally onto foundations, bridge piers, or equipment pads without crane involvement. It is frequently used for bridge superstructure placement, transformer installation at substations, and industrial equipment that must be slid into position within existing structures.

SPMTs (Self-Propelled Modular Transporters)

SPMTs are computer-controlled multi-axle platform transporters that combine transport and precision placement. Each module has independently controlled axle lines with hydraulic suspension, and modules can be combined into arrays handling loads exceeding 10,000 tons. SPMTs are governed by site-specific engineering rather than a single ASME standard, and they are the equipment of choice for moving prefabricated modules in petrochemical, LNG, and power generation construction.

Tandem and Multi-Crane Lifts

When a single crane cannot handle the load, two or more cranes may work in coordination. OSHA 29 CFR 1926.1432 requires these construction lifts to be planned by a qualified person and directed by a lift director who meets the rule’s competency requirements. Load sharing, swing coordination, and communication protocols should be addressed in the plan and reviewed with everyone involved. Tandem lifts are common for bridge beams, large structural steel assemblies, and mechanical equipment that exceeds single-crane capacity.

Industries Served

Heavy lifting services support projects across multiple sectors:

• Construction — Setting structural steel, precast components, and mechanical equipment on commercial, institutional, and infrastructure projects. See our crane rigging services for standard construction lifts.
• Energy and Power Generation — Turbine sets, generator stators, boiler components, and transformer installations at fossil fuel, nuclear, and renewable energy facilities.
• Petrochemical and Refining — Reactor vessels, distillation columns, heat exchangers, and modular process units that routinely exceed 500 tons.
• Manufacturing — Heavy press installations, CNC and production line equipment, and plant expansions requiring precision placement within operating facilities.
• Infrastructure — Bridge segments, tunnel boring machine components, lock gates, and water treatment equipment.

Engineering Requirements

Heavy lifts demand a level of engineering analysis that distinguishes them from standard rigging operations:

• Engineered lift plans — Requirements vary by project and jurisdiction. OSHA 29 CFR 1926.1432 requires a qualified person to plan multi-crane construction lifts and requires engineering expertise when that person determines it is needed. Customers, site procedures, contracts, or local authorities may impose additional documentation or PE-stamp requirements.
• Finite Element Analysis (FEA) — Non-standard lifting lugs, spreader beams, and temporary support structures require FEA to verify stress distribution and confirm adequate safety factors. AISC Design Guide 29 (Vertical Bracing Connections) and AWS D1.1 (Structural Welding Code) govern the design and fabrication of steel lifting attachments.
• Ground bearing studies — Crane outrigger loads and gantry reactions concentrate massive forces onto small areas. Geotechnical analysis confirms that soil bearing capacity and any temporary foundations (timber mats, steel plates, or engineered pads) can support the imposed loads without settlement.
• Rigging engineering — Sling angles, shackle ratings, and hardware selection per ASME B30.9 (Slings) and ASME B30.26 (Rigging Hardware) must account for dynamic load factors, side loading, and the specific geometry of each pick.

Safety Protocols for Heavy Lifts

Heavy lift safety goes beyond standard rigging protocols. The consequences of failure scale with the load — a dropped 500-ton vessel is a catastrophic event, not a near-miss. Key safety requirements include:

• Pre-lift engineering review with all parties (contractor, owner, engineer of record) reviewing the lift plan, contingency procedures, and stop-work criteria
• Load monitoring systems including load cells on crane hooks and gantry legs that provide real-time weight data during the lift
• Weather protocols with documented wind speed limits (typically 20–25 mph for heavy lifts, lower for high-profile loads) and suspension criteria
• Exclusion zones cleared of all non-essential personnel during the lift, with barricading per the lift plan
• Communication protocols using dedicated radio channels with qualified signal persons per OSHA 29 CFR 1926.1428

Contractors in the Specialized Carriers & Rigging Association (SC&RA), an international trade association of more than 1,400 members across 46 countries, follow industry best practices for heavy lift safety and maintain the specialized insurance, engineering capabilities, and equipment certifications these projects demand.

Our Matching Process

Heavy lift projects require contractors with specific equipment, engineering depth, and a documented track record on comparable jobs. We match you with heavy lift specialists based on your load weight, lift method, geographic location, and project timeline. Every contractor in our network maintains current OSHA compliance, appropriate insurance limits for heavy lift work, and demonstrated experience with the equipment and methods your project requires. Whether your project involves a 50-ton tandem crane lift or a 2,000-ton strand jack operation, we connect you with qualified crews who have done it before. For projects that also require over-the-road transport of heavy components, see our heavy haul services.