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Industry Glossary Term

Tied-Arch

A bridge or structural design where a curved arch is connected to a horizontal tension member, preventing the arch from spreading. Subcontractors may encounter tied-arch structures on pipeline crossings, access bridges, or heavy industrial sites. Rigging, lifting, and load planning must account for the unique stress distribution in these structures.

Related Terms

Turnkey Contract

Industry

A fixed-price agreement where the subcontractor delivers a fully completed scope of work for a set sum. You absorb all cost overruns, so accurate estimating and tight cost control are critical. Profit or loss depends entirely on how well you manage execution against your original bid.

AFE (Authorization for Expenditure)

Industry

A budgeting document used in oil and gas projects that outlines expected costs and seeks approval before work begins. Subcontractors often work under AFEs issued by operators.

Drilling Pad

Industry

A prepared surface site where one or more wellbores are drilled from a central location. Subcontractors often mobilise equipment and crew to serve multiple wells from a single pad. This reduces move-out costs and can extend your on-site contract duration.

Sanctioned Field

Industry

A field development that has received formal investment approval from the operator or project owner. For subcontractors, sanction signals that contracts, mobilisation, and work orders are imminent. It marks the transition from planning to active field execution.

Scope Validation

Industry

The process of confirming that the work described in a contract matches actual field conditions before mobilising. Subcontractors use it to catch scope gaps that could lead to unpaid extras. Undocumented changes discovered on-site are easier to dispute without prior validation.

Directional Drilling

Industry

A drilling technique used to steer a wellbore along a non-vertical path to reach a target zone. Subcontractors supporting these operations often require specialised tooling, MWD (Measurement While Drilling) equipment, and certified directional hands. Scopes can shift quickly, so flexible crew and equipment mobilisation is essential.

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