Page 482 - Trenchless Technology Piping Installation and Inspection

432 App endix D

SDR: See standard dimension ratio

Segmental lining: See sliplining.
Segmental sliplining: See sliplining.
Self-cleansing: A consequence of good hydraulic design when the pipe
invert is kept relatively free of sediments by ensuring adequate flow
velocities.
Semi-structural liner: A liner that in its own entity does not have the
required strength to withstand internal, external, or both types of loading
from soil column, traffic, and groundwater pressure for the design life of
the product, but will offer some level of structural support against internal
pressure.

Separate system: A system that uses sanitary sewers to convey the
wastewater and stormwater sewers to carry the stormwater.
Sewer: An underground pipe or conduit for transporting stormwater,
or wastewater, or both.
Sewer cleaning: The use of mechanical or hydraulic equipment to
dislodge, transport, and remove debris from sewer lines.
Sewer lateral: A building sewer (sometimes referred to as a sewer lateral
or house lateral) is the pipeline between the public sanitary sewer line,
which is usually located in the street, and the indoor plumbing.
Sewer pipe: A length of conduit, manufactured from various materials
and in various lengths, that when joined together can be used to transport
wastewaters from the points of origin to a treatment facility. Types of
pipe are: acrylonitrile-butadiene-styrene (ABS); asbestos-cement (AC);
brick pipe (BP); concrete pipe (CP); cast iron pipe (CIP); polyethylene
(PE); polyvinyl chloride (PVC); and vitrified clay (VC).
Shield (shield system): means a structure that is able to withstand the
forces imposed on it by a cave-in and thereby protect employees within
the structure. Shields can be permanent structures or can be designed to
be portable and moved along as work progresses. Additionally, shields
can be either pre-manufactured or job-built in accordance with
1926.652(c)(3) or (c)(4). Shields used in trenches are usually referred to as
“trench boxes” or “trench shields.”
Shoring (shoring system): A structure such as a metal hydraulic,
mechanical or timber shoring system that supports the sides of an
excavation and is designed to prevent cave-ins.
Shotcrete: Spraying wet concrete (see also gunite).
Skin friction: Resistance to advancement caused by soil pressure around
the pipe or casing.
Slipline: A renewal technique covering the insertion of one pipe inside
an existing pipe.