Rigging technology has evolved dramatically over the past three decades. From the introduction of high-strength synthetic fibres and computerised load planning to advanced crane telemetry systems and digital lift monitoring, modern rigging operations bear little resemblance to the practices of even twenty years ago. This article examines the key technological advances shaping heavy lifting and rigging in South Africa and globally, and what they mean for project safety, efficiency, and cost.
How Has Rigging Technology Changed in Recent Decades?
The most significant technological shifts in rigging have occurred in three areas: materials science, computing and digital tools, and crane technology itself. Advances in high-strength steel alloys have produced rigging chains and hooks with far greater strength-to-weight ratios than was previously achievable. Synthetic fibre slings made from ultra-high-molecular-weight polyethylene (UHMWPE) — marketed as Dyneema or Spectra — offer strength comparable to wire rope at a fraction of the weight. And digital tools from load calculation software to computerised crane load charts have transformed the planning and execution of complex lifts.
What Are Modern Crane Load Monitoring Systems and How Do They Work?
Modern mobile cranes are equipped with load moment indicators (LMIs) and load management systems that continuously calculate the crane’s actual load relative to its rated capacity at the current boom angle and radius. Real-time capacity displays allow the operator to monitor exactly how close the crane is operating to its limits throughout a lift. For critical lifts, additional load cells can be attached to the rigging to independently verify actual load weight. These systems significantly reduce the risk of overloading — one of the leading causes of crane incidents.
How Is Digital Technology Changing Lift Planning?
Digital lift planning tools allow rigging engineers to create three-dimensional simulations of lifting operations before any equipment is deployed. These tools can verify crane positioning, check that the planned lift path is clear of obstructions, calculate sling tensions at each stage of the lift, and identify conflicts between different phases of the operation. For complex projects — particularly those involving multiple cranes, confined spaces, or precision installation — digital pre-planning reduces the number of unknowns encountered on the day and improves the overall quality of the lift plan.
What Are the Emerging Trends in Rigging and Heavy Lifting Equipment?
Several trends are shaping the future of rigging and heavy lifting. Self-propelled modular transporters (SPMTs) — computer-controlled multi-axle vehicles capable of carrying very large and heavy loads with extraordinary precision — are becoming more widely available in South Africa for mega-project applications. Electric and hybrid cranes are entering the market, offering reduced emissions for urban and environmentally sensitive projects. And improved rigging materials — particularly UHMWPE synthetic slings — are enabling lighter, easier-to-handle rigging configurations for loads that previously required heavier wire rope or chain.
Reef Rigging stays current with advances in rigging technology to ensure that every project benefits from the best available tools and methods. Contact the team to discuss how modern rigging technology can be applied to your project.
Frequently Asked Questions: Rigging Technology
What is UHMWPE and why is it used in rigging?
UHMWPE (Ultra-High-Molecular-Weight Polyethylene) is a synthetic fibre that offers exceptional tensile strength — comparable to or exceeding wire rope of the same diameter — at a fraction of the weight. UHMWPE slings are lighter, easier to handle, and gentler on load surfaces than wire rope or chain. They also have very high resistance to chemicals and UV light. The main limitations are that they are not suitable for use above approximately 70°C (they soften at higher temperatures) and they can be damaged by cutting hazards — care is needed to protect them from sharp edges.
What is a load moment indicator (LMI) on a crane?
A load moment indicator (LMI) is a safety system fitted to mobile cranes that continuously monitors and displays the relationship between the actual load on the crane hook and the crane’s rated capacity at the current boom configuration and radius. Most modern LMIs provide both a real-time display and an audible warning when the load approaches a set percentage of the crane’s rated capacity. LMIs are required by South African crane regulations and must be functional before a crane can be used.
How do SPMTs work and when are they used in South Africa?
Self-Propelled Modular Transporters (SPMTs) are multi-axle transport vehicles where each axle is independently steered and suspended. Multiple units can be linked together to create a transport platform of any size, capable of carrying loads from hundreds to thousands of tonnes. They are controlled by a computer system that ensures all axles share the load uniformly and can steer the entire platform precisely. In South Africa, SPMTs are typically used for mega-project applications such as moving large process vessels, offshore modules, or power generation equipment on specialist project sites.