Definitions for Underground Utility Terms T

Tap Connection: A connection made to an existing utility line to provide service to a new property or customer.

Tapping Machine: A specialized machine or tool used to create a branch connection or tap on an existing underground utility pipe, allowing for the installation of service connections or extensions.

Tapping Sleeve: A mechanical fitting or device used to create a connection on an existing underground pipe, allowing for the installation of a branch or service connection without interrupting the flow.

Tapping: Tapping refers to the process of creating a connection or access point on an existing underground utility pipe or mainline. Tapping is typically done by drilling or cutting into the pipe to install a fitting or connection for various purposes, such as branching off a new service line or installing a valve or meter. Proper tapping techniques ensure a secure and leak-free connection to the existing utility infrastructure. Learn More…

Temporary Bypass: A temporary arrangement or system set up to redirect the flow of water or fluids in underground utility networks during maintenance, repairs, or emergency situations.

Test Pit: A small excavation made to visually inspect underground utilities or to gather additional information.

Thermal Expansion Joint: A joint or coupling designed to accommodate the expansion and contraction of underground utility pipes due to temperature changes, preventing damage or stress.

Thermal Imaging: The use of infrared technology to capture and visualize temperature variations, commonly used to identify leaks, insulation issues, or heat loss in underground utility systems.

Thermal Insulation: The application of materials or coatings to underground utility pipes or structures to reduce heat transfer, conserve energy, and prevent temperature fluctuations.

Thrust Bearing: A device or mechanism installed in underground utility systems to absorb or transmit the forces generated by the movement or expansion of pipes.

Thrust Block: A reinforced concrete block or structure used to resist the thrust or forces generated by the flow of fluids in a pipeline.

Thrust Restraint Anchor: A device or structure used to secure or anchor a pipeline against the forces generated by internal pressure or ground movement.

Thrust Restraint Block: A device or structure used to restrain or anchor a pipeline against the thrust or pressure generated by the flow of fluids.

Thrust Restraint Collar: A device or component used to restrain or secure pipes against axial movement or separation caused by internal pressure or external forces.

Thrust Restraint Design: The engineering analysis and calculation of forces, loads, and support systems required to restrain underground pipes or conduits against the thrust or movement caused by internal or external forces.

Thrust Restraint: Devices or structures used to anchor or restrain a pipeline against the forces generated by internal pressure.

Tricone: A tricone, also known as a triple cone drill bit, is a type of rotary drill bit used in the oil and gas industry for drilling deep boreholes in the earth’s crust. Learn More…

Torque Wrench: A specialized wrench used to apply a specific amount of torque or rotational force when tightening bolts or fittings.

Trace Wire: A thin, conductive wire or cable buried alongside underground utility lines to facilitate the locating and tracing of the utilities.

Tracer Wire: A metallic wire buried alongside underground utility lines, used to facilitate the locating and tracing of the utilities.

Traffic Control: Measures and signage implemented to manage vehicular and pedestrian traffic near underground utility work zones, ensuring safety and minimizing disruptions.

Traffic Loop: An underground sensor embedded in roadways to detect the presence or movement of vehicles for traffic signal control or data collection.

Transient Voltage Surge Suppressor (TVSS): A device installed in underground electrical systems to protect against voltage spikes or surges caused by lightning strikes or electrical disturbances.

Transition Coupling: A specialized fitting or coupling used to connect underground utility pipes or conduits made of different materials or sizes, ensuring a secure and leak-free connection.

Transmitter: A device used in conjunction with locator wands or receivers to emit signals for the purpose of locating underground utilities.

Trench Safety Training: Training programs or courses that educate workers about the hazards and safety precautions associated with working in and around trenches during underground utility projects.

Trench Shield: A protective structure or system placed in a trench to safeguard workers from cave-ins and soil instability during underground utility construction or repairs.

Trench Width: The horizontal distance between the sidewalls of a trench in underground utility construction, determined based on soil conditions, depth, and worker safety requirements.

Trench: A long, narrow excavation in the ground used for the installation of underground utilities.

Trenchless Rehabilitation: Various techniques, such as pipe bursting, cured-in-place lining (CIPP), or slip-lining, used to repair or replace underground utility pipes without extensive excavation.

Trenchless Technology: A range of construction methods that minimize excavation and surface disruption during underground utility installation or repairs, such as horizontal directional drilling or pipe jacking.

Tunnel Boring Machine: A mechanized device used to excavate underground tunnels by cutting through soil or rock, commonly used in larger-scale underground utility projects.