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IndustryGlossary Term

Transmission Upgrades

Large-scale projects to expand or modernise pipeline or power transmission infrastructure. For subcontractors, these generate significant work in welding, civil prep, and equipment installation. Scopes are often phased, requiring flexible crew deployment and quick mobilisation.

Related Terms

EPC (Engineering, Procurement, Construction)

Industry

A project delivery model where one main contractor handles all phases from design to completion, typically creating multiple subcontracting opportunities for field service companies across different project phases. For subcontractors, EPC projects often mean working under a prime contractor who coordinates all trades and manages the overall timeline and specifications.

Facility Tie-in

Industry

The process of connecting new pipelines, equipment, or infrastructure to an existing operating facility. For subcontractors, tie-in work often requires strict hot-work permits and coordinated shutdowns with the operator. Scope can expand quickly, so clear change-order procedures are essential before mobilising.

Mainline Pipe

Industry

The primary, large-diameter pipe forming the backbone of a transmission or distribution pipeline system. Subcontractors are typically hired for mainline installation, coating, welding, or hydrotesting scopes. Work on mainline pipe often carries strict inspection and quality requirements.

Brownfield Site

Industry

An existing facility or infrastructure that is being modified, expanded, or recommissioned rather than built from scratch. Subcontractors should expect tighter work windows, live-equipment hazards, and strict permit-to-work requirements. Scheduling and coordination with ongoing operations are critical on brownfield projects.

Lattice Boom

Industry

An open-framework steel crane arm made of welded triangular sections, used for heavy lifts on oil and gas or construction sites. Subcontractors must verify lift plans and operator certifications before mobilising lattice boom cranes. Daily rates and rigging crew requirements are typically higher than hydraulic boom alternatives.

Topside

Industry

The above-water structure of an offshore platform, including processing equipment, living quarters, and wellheads. Subcontractors working topside must meet strict offshore safety and certification requirements. Scope of work and billing rates often differ significantly from subsea or onshore assignments.

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