| Term |
Definition |
|
| Lateral |
A service line that transports wastewater from individual buildings to a main sewer line. |
| Lateral connection |
The point at which the downstream end of a building drain or sewer connects into a larger diameter sewer. |
| Lateral spur |
The lateral spur is that section of the sewer lateral which extends from the County sewer line to the end of the sewer lateral from the house/building which generally terminates one foot within the property line. Lateral spurs are installed at the ti |
| Launch pit |
Also known as Drive Pit, but more usually associated with "launching" an Impact Moling tool. |
| Launch seal |
A mechanical seal, usually comprised of a rubber flange that is mounted to the wall of the drive shaft. The flange seal is distended by the MTBM as it passes through creating a seal to prevent water or lubrication inflow into the shaft during tunneli |
| lb/ft |
US customary units for weight per unit length. One lb/ft equals 1.488 kilograms per meter. |
| Lead pipe |
The leading pipe designed to fit the rear of a jacking shield and over which the trailing end of the shield is fitted. |
| Length of drill rod |
Nominal length of drill rod. |
| Line |
(1) The specified direction of the proposed bore in a horizontal plane. (2) (Path) The shortest distance between two points as laid out by a survey crew for the installation of pipelines and their bores and tunnels. |
| Liner plate |
A proprietary product, used to line tunnels instead of casing, and comes in formed steel segments. When these segments are bolted together they form a structural tube to protect the tunnel from collapsing. The segments are made so that they may be bo |
| Lining |
A rehabilitation process where a length of material is introduced to extend the life of the existing sewer. The lining may or may not utilize some structural strength from the existing sewer; and it may or may not function as a structural enhancement |
| Lining with close-fit pipes |
Method of lining with a continuous pipe for which the cross section is reduced to facilitate installation, and reverted after installation to provide a close fit to the existing pipe. |
| Lining with continuous pipe |
Method of lining with a pipe made continuous for the length of the section to be renovated prior to insertion, and which has not been shaped to give a cross sectional diameter smaller than its final diameter after installation. |
| Lining with cured-in-place pipes |
Method of lining with a flexible tube impregnated with a thermosetting resin, which produces a pipe after resin cure. |
| Lining with discrete pipes |
Method of lining with pipes shorter than the section to be renovated which are not jointed prior to insertion to form a continuous pipe, and which have not been shaped to give them a cross sectional diameter smaller than their final diameter after in |
| Lining with inserted hose |
Method of lining with a loose fit reinforced hose to provide a pipe lining such that fluids may be conveyed under pressure. |
| Lining with pipe segments |
Method of lining with pipe sections made of at least two pieces with both longitudinal and circumferential joints. |
| Lining with spirally wound pipes |
Method of lining with a profiled strip, spirallywound to form a continuous pipe after installation. |
| Lipping |
A degree of overlap between adjacent units. |
| Live insertion |
Installation of a liner whilst the product pipe remains in service. |
| Localized (spot) repair |
Repair work on a pipe, particularly sewerage, to an extent less than the run between two access points. |
| Locator |
An electronic instrument used to determine the position and strength of electro-magnetic signals emitted from a transmitter sonde in the pilot head of a boring system, in an impact moling tool or from existing underground services which have been ene |
| Long term strength |
The hoop stress in the wall of the pipe is sufficiently low that creep (relaxation) of the materials is nil and assures service life in excess of 50 years. |
| Low load method |
A pipe jacking method in which separate provision is made to carry the jacking load, the pipe being installed carrying little or none of the jacking force. |
| Lubrication |
A fluid, nort equal to 1000 pounds. |
