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IndustryGlossary Term

Fractionating Tower

A large vertical vessel at refineries and gas plants that separates hydrocarbons into usable products like propane, naphtha, and diesel. Subcontractors are frequently called in for turnaround maintenance, inspection, and refractory work on these units. Access planning and confined space protocols are critical for any scope inside the tower.

Related Terms

Surface Coil System

Industry

A temporary heating system using fluid-filled coils laid on the ground to thaw frozen soil or maintain process temperatures. Subcontractors are often hired to install, monitor, and remove these systems during cold-weather operations. Common in northern pipeline and facility projects where ground conditions affect construction timelines.

Export Terminal

Industry

A facility where oil, gas, or LNG is transferred from pipelines or storage for shipment to buyers. Subcontractors are often mobilised here for maintenance, inspection, and commissioning work. Security clearances and site-specific safety certifications are typically required.

Valve Leak

Industry

A valve leak occurs when a valve fails to fully seal, allowing unintended fluid or gas flow. For subcontractors, it often triggers emergency callouts, inspection holds, or scope additions. Document all findings carefully to support change order billing.

Combined Cycle

Industry

A power generation setup where waste heat from a gas turbine is reused to produce additional electricity via a steam turbine. Subcontractors working these facilities must be prepared for more complex systems and stricter safety protocols. Maintenance scopes are typically broader, covering both turbine types.

ISNetworld

Industry

A contractor management platform used by operators to verify that subcontractors meet safety, insurance, and compliance requirements before being allowed to work on sites. Maintaining ISNetworld compliance is essential for subcontractors working with major operators.

Booster Compressor

Industry

A secondary compressor used to increase gas pressure in pipelines or processing systems when inlet pressure is too low. Subcontractors are often hired to install, operate, or maintain these units on short-term field assignments. Rental and service contracts for booster compressors are common in late-life field operations.

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