Definition - What does Preparatory Cleaning mean?
Preparatory cleaning refers to the removal of debris and obstructions such as sand, dirt, sediments, roots, concrete and other foreign objects from the interior of a sewer pipeline to allow ease of access for manual inspections.
The cleaning is typically performed using mechanically powered or hydraulically powered sewer cleaning equipment.
Trenchlesspedia explains Preparatory Cleaning
In order for manual inspections to be carried out, either by physical entry or by manually controlled CCTV cameras, it is essential that the area to be inspected is free of debris and obstructions. Preparatory cleaning is performed prior to inspection to ensure that work can be carried out unhindered.
This type of cleaning is usually done using hydraulic equipment such as jet cleaners, jet rodders, and high-velocity cleaners. In addition to providing unobstructed access, preparatory cleaning can also increase the efficiency of the inspection process by revealing defects that may have been otherwise been hidden by grease, dirt, sludge etc.