Glossary

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Segmental Lining

Method of lining with pipe sections made of at least two pieces with both longitudinal and circumferential joints.

Segmental Sliplining

See Discrete Sliplining

Skin Friction

The resisting force created between pipes and soil when the pipes are jacked forward.

Sleeve Pipe

Pipe installed as external protection to a product pipe.

Slime Shield

Earth pressure balance shield with soil conditioning additives to facilitate the excavation of the ground.

Slurry Chamber

A chamber located behind the cutting head of a slurry microtunneling machine, in which excavated material is mixed with the slurry for transport to the surface.

Slurry Line

A series of hoses and pipes that transport tunnel muck and slurry from the face of a slurry microtunneling machine to the ground surface for separation.

Slurry Separation

A process in which excavated material is separated from the circulation slurry.

Slurry TBM

A microtunnel method that uses tunnel Boring Machine (TBM) or shield with closed face which employs hydraulic means for removing the excavated material and balances the ground water pressure.

Soft Lining

See Cured-In-Place Pipe (CIPP)

Sonde

Transmitter located near the front of an HDD drill string that sends an electronic signal that provides location and depth of the drill string near the bit. The sonde signal also transmits pitch, roll, temperature, and battery status to the receiver.

Spacer

Mechanical structure used to connect the jacking thrust ring to the pipe and used to accommodate lengths of pipe that are longer than the stroke length of the jack.

Spiral Lining

Method of lining with a profiled strip, spirally wound to form a continuous pipe after installation.

Spoil

Earth, rock, and other materials removed during installation.

Spray Lining

Method for applying a lining, usually of cement mortar or resin, by a rotating spray head which is winched through an existing pipeline.

Standard Dimensional Ratio (SDR)

Numerical designation of a pipe series which is a convenient round number approximately equal to the ratio of the nominal outside diameter and the minimum wall thickness.

Steel Banded Joint

A joint formed with a steel band to locate and join each pipe. Usually used with butt-ended pipes.

Steerable Moling

Method similar to impact moling but with limited steering capability.

Structural Renovation

Pipe renovation methods that do not require the structured-wall (SW) of the host pipe to contribute to the ring stiffness needed to satisfy the integrity of the utility

Survey Tools

Downhole equipment and instruments used to determine the position of a bore in directional drilling or in site investigation.

Swivels

Devices placed between the reamer and the duct puller or pulling head to eliminate rotation of the product during pullback.