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 energized. Sometimes referred to as a Walkover System.

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.