A vertical guide structure on a pile-driving or drilling rig that keeps the drill string or pile aligned during penetration. Subcontractors working near this equipment must follow strict exclusion zone protocols. It is also called a mast or leads on some rigs.
Leader (drilling Rig)
Related Terms
Duct Bank
IndustryA grouped arrangement of conduits encased in concrete, used to route electrical or communication cables underground on job sites. Subcontractors installing or excavating near duct banks must follow strict dig protocols to avoid damaging live services. Identifying duct bank locations early prevents costly delays and liability.
Hookup
IndustryThe phase where installed equipment and systems are connected to utilities, instrumentation, and process lines. For subcontractors, hookup work often follows construction and represents a distinct, billable scope. Crews must coordinate closely with commissioning teams to avoid delays.
Pipeline Capacity
IndustryThe maximum volume of oil, gas, or fluid a pipeline can transport over a given period. For subcontractors, capacity constraints directly affect project scheduling and the urgency of inspection, maintenance, and tie-in work. Operators may fast-track field service contracts when pipelines are running near capacity limits.
Header System
IndustryA network of pipes that collects flow from multiple wells or lines into a single outlet point. Subcontractors often tie into or maintain header systems during facility hookups and commissioning work. Knowing the configuration is critical for safe isolation and pressure management on site.
BIM (Building Information Modelling)
IndustryA shared 3D digital model of a construction project that contains structural, mechanical, and site data. Subcontractors use it to coordinate work sequences, avoid clashes with other trades, and verify installation specs before mobilising. Access to the BIM model is often required before entering a worksite.
Refrigerated Storage
IndustryTemperature-controlled storage units used on job sites to preserve perishables, vaccines, or heat-sensitive materials. Subcontractors may need to supply or rent these units for remote or long-duration projects. Costs are typically itemised as a reimbursable expense in the contract.
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