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IndustryGlossary Term

Pipeline Tie-in

A pipeline tie-in is the physical connection of a new pipeline section to an existing live system. For subcontractors, tie-in work often requires hot-tap certified crews and strict isolation procedures. Scheduling is critical, as tie-ins typically involve planned shutdowns with tight production windows.

Related Terms

Equipment Uptime

Industry

The percentage of scheduled time that equipment is operational and available for use on a job site. For subcontractors, high uptime directly affects billing hours, client satisfaction, and contract renewals. Downtime caused by mechanical failure or poor maintenance often falls on the subcontractor to remedy at their own cost.

Borrow Material

Industry

Soil, gravel, or fill excavated from one location and transported to another for grading or earthwork. Subcontractors may need to source, haul, and place borrow material as part of site prep scopes. Confirm who supplies and pays for it before signing your contract.

Shaft Sinking

Industry

The process of excavating a vertical or near-vertical tunnel from surface down to an underground work area. Subcontractors are often engaged for specialised tasks like lining, hoisting, or ground support during this phase. It is common in mining, utility, and heavy civil construction projects.

Acreage

Industry

A block of land held under lease by an operator for exploration or production activity. For subcontractors, active acreage signals where drilling, completions, or facility work is likely to be awarded. Larger acreage positions often mean longer-term, repeat work opportunities in a region.

PPA (Power Purchase Agreement)

Industry

A long-term contract where a buyer agrees to purchase electricity from a generator at a fixed price. For subcontractors, PPAs on large sites can affect whether temporary or permanent power infrastructure is in scope. Understanding site power arrangements helps clarify mobilisation costs and equipment requirements.

Master Developer

Industry

A company that holds the primary land or project rights and oversees all development activity on a large site. Subcontractors typically work several tiers below them, hired through general contractors or prime contractors. Understanding this structure helps you identify who controls scope changes and payment approvals.

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