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Industry Glossary Term

Tunnel Liner

A structural shell installed inside a bored tunnel to support surrounding soil or rock and maintain bore integrity. Subcontractors installing liners must meet strict tolerances and inspection hold points. Work is often sequenced tightly with boring crews, requiring close schedule coordination.

Related Terms

Modular Above-Ground Storage

Industry

Prefabricated, relocatable tanks or containment units installed on-site without permanent foundations. Subcontractors use them for temporary fuel, water, or chemical storage on remote or fast-moving job sites. Their modular design speeds up mobilisation and reduces civil work costs.

Hot Shot

Industry

Expedited delivery service for equipment, parts, or materials to remote job sites. Often used for urgent oilfield deliveries.

Frac Flowback

Industry

The phase after hydraulic fracturing when water, sand, and hydrocarbons flow back to surface from the wellbore. Subcontractors are often mobilised quickly to manage fluid handling, testing, and disposal. Flowback work can be short-duration but requires crews and equipment on standby.

OSHA

Industry

Occupational Safety and Health Administration. The US federal agency responsible for workplace safety regulations. Compliance with OSHA standards is required for contractors working in the United States.

Cleanout

Industry

A service job focused on removing debris, scale, or obstructions from a wellbore, tank, or pipeline. Subcontractors are often mobilised on short notice to perform cleanouts between production phases. Accurate job scoping is critical, as unforeseen material volumes can affect your quoted price.

Feasibility Study

Industry

A pre-project assessment that evaluates whether a scope of work is technically and financially viable. For subcontractors, it signals early-stage work that may lead to awarded contracts. Participating in feasibility work can position your company for the larger project bid.

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