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IndustryGlossary Term

PPA (Power Purchase Agreement)

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.

Related Terms

NPRA (National Petroleum Reserve-alaska)

Industry

A large federally managed area in northwest Alaska open to oil and gas exploration and development. Subcontractors working here face extreme remote logistics, strict federal permitting, and seasonal access windows. Mobilisation costs and compliance requirements are significantly higher than conventional onshore projects.

Thermal Hotspot

Industry

An area of abnormally high surface temperature detected during infrared inspection of electrical, mechanical, or process equipment. Hotspots often signal failing components, loose connections, or insulation breakdown requiring urgent repair. Subcontractors must document and report findings promptly to avoid liability and costly unplanned shutdowns.

HRSG (Heat Recovery Steam Generator)

Industry

A large boiler unit that captures exhaust heat from gas turbines to produce steam for power generation. Subcontractors are commonly engaged for HRSG installation, maintenance, and inspection scopes. Work typically requires certified welders, boilermakers, and compliance with pressure vessel regulations.

SCOOP (South Central Oklahoma Oil Province)

Industry

A major oil and gas play in south-central Oklahoma targeting Woodford and Springer shale formations. Subcontractors working this basin should expect high-volume drilling and completions activity. It is a key area for securing long-term field service contracts.

Instrument Air Systems

Industry

Compressed air networks that power pneumatic valves, controls, and instrumentation on oil and gas and industrial sites. Subcontractors must ensure supplied air meets strict dryness and purity standards before connecting equipment. Contaminated or wet instrument air can damage sensitive controls and trigger costly shutdowns.

NOC (National Oil Company)

Industry

A state-owned oil producer that controls exploration and production within its country. NOCs often require local content compliance, affecting subcontractor hiring and procurement. Payment cycles and approval chains can be longer than with private operators.

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