Renovation

Methods of rehabilitation in which all or part of the original fabric of a pipeline are incorporated and its current performance improved.

Repair

Rectification of damage to the structural fabric of the sewer, or the reconstruction of short lengths, but not the reconstruction of a whole pipeline.

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.