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IndustryGlossary Term

T&D (Transmission and Distribution)

The network of high-voltage power lines, towers, substations, and local distribution lines that move electricity from generators to end users. Subcontractors in this sector handle tasks like line construction, pole installation, and substation work. T&D projects are often awarded through utility frameworks or provincial grid operators.

Related Terms

Chokepoint

Industry

A stage in a project where workflow bottlenecks, delaying downstream tasks and crew productivity. For subcontractors, chokepoints often occur at inspection holds, permit approvals, or material deliveries. Identifying them early helps protect schedule and avoid costly standby time.

Grid Hardening

Industry

Upgrades to electrical infrastructure that improve resilience against outages, extreme weather, and physical damage. For subcontractors, it drives demand for line work, equipment installation, and civil construction crews. Contracts often involve tight timelines and utility compliance requirements.

TOFD (Time-of-flight Diffraction)

Industry

An ultrasonic weld inspection method used to detect and size internal flaws in pipelines and pressure vessels. Subcontractors performing NDT work must hold TOFD-specific certifications to qualify for this scope. It is widely accepted by regulators as an alternative to radiographic testing.

PSI (Pounds Per Square Inch)

Industry

A unit measuring pressure in pipelines, hydraulic systems, and wellhead equipment. Subcontractors must verify PSI ratings when selecting tools, hoses, and fittings for safe operation. Exceeding rated PSI limits can trigger equipment failure, injuries, and liability.

PAUT (Phased Array Ultrasonic Testing)

Industry

An advanced non-destructive testing method that uses multiple ultrasonic beams to inspect welds, pipelines, and structural components for defects. It produces detailed cross-sectional images without cutting or damaging the material. Subcontractors offering PAUT services typically require certified Level II or III technicians and specialised portable equipment.

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.

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