A tie-in is the physical connection of new pipeline or equipment to an existing operational system. For subcontractors, tie-in work often requires strict scheduling around shutdowns and may involve additional safety and permitting requirements. Scope changes during tie-ins can affect billing, so clear change-order terms are essential.
Industry Glossary Term
Tie-In
Related Terms
In-Service Date
IndustryThe date when equipment or a facility is officially commissioned and begins active operation. For subcontractors, this date often triggers billing milestones, warranty periods, or contract close-out requirements. Missing this date can result in penalties or delayed final payment.
Condensate
IndustryA light liquid hydrocarbon that separates from natural gas during production and processing. Subcontractors handling condensate must follow strict hazmat protocols, as it is highly volatile and flammable. It is often measured and valued separately from crude oil on production sites.
Project Delivery Method
IndustryThe contractual framework that determines how an owner, general contractor, and subcontractors are organised on a project. It directly affects when you get hired, who you report to, and how your scope is defined. Common methods include DBB (Design-Bid-Build), DB (Design-Build), and EPCM (Engineering, Procurement, and Construction Management).
Infrared Camera Survey
IndustryA thermal imaging inspection using IR (Infrared) cameras to detect heat anomalies in equipment, piping, or electrical systems. Subcontractors use these surveys to identify leaks, insulation failures, or overloaded components without shutting down operations. Clients often require certified IR thermographers, so confirm crew credentials before mobilising.
Cold-Milling
IndustryA pavement removal process where a rotating drum grinds away asphalt or concrete surfaces without heat. Subcontractors use it for road rehabilitation, site prep, and surface levelling on construction and industrial projects. Milled material is typically recycled or hauled off-site by the crew.
Appraisal Well
IndustryA well drilled after a discovery to confirm the size and viability of a reservoir. For subcontractors, appraisal programmes signal short-term scopes before a full development decision is made. Mobilisation windows are often tight and contracts may be limited to single-well terms.
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