Replacement

Construction of a new sewer, on or off the line of an existing sewer. The function of the new sewer will incorporate that of the old, but may also include other improvements or development work.

Rerounding

A preparatory process which involves the insertion of an expansion device into a distorted pipe to return it to a circular cross section. This is usually carried out prior to the insertion of a permanent liner or supporting band.

Rescue Shaft

An unplanned additional shaft required to remove obstacles/obstructions and/or retrieve or repair the MTBM. The rescue shaft may need to function as a jacking shaft to complete the drive.

Resin Impregnation (Wet-Out)

A process used in cured-in-place pipe installation where a plastic coated fabric tube is uniformly saturated with a liquid thermosetting resin while air is removed from the coated tube by means of vacuum suction.

Resin Injection

The localized repair of pipes, usually sewers, by injection of a resin formulation into cracks or cavities which subsequently cures to prevent leakage and further deterioration. It may also increase the structural strength of the pipeline.