A range of techniques in which the liner is reduced in cross sectional diameter before insertion into the Carrier PipePipe for conveyance of water, gas, sewage, or other products and services. Some carrier pipe can be installed by direct jacking (i.e. one-pass microtunneling).. It is subsequently restored to close to its original diameter, generally forming a close fit with the original pipe. Methods of cross sectional area reduction include squeezing, folding into a U-shape or stretching. See LiningA 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 within the existing sewer, or an internal non-structural coating or lining material applied to a pipe. with Close-fitDescription of a lining system in which the new pipe makes close contact with the defective pipe at normal or minimum diameter. An annulus may occur in sections where the diameter of the defective pipe is in excess of this. Pipes.
