ITU-T L.73 PDF

This Recommendation:

− makes a classification of different methods for inspecting and repairing underground ducts;

− describes both trenchless methods and conventional methods;

− is limited to the methods for underground ducts in which no cables are installed;

− focuses on methods for underground ducts that have single-way duct unit systems and are made of plastic materials such as polyvinyl chloride (PVC) and polyethylene (PE);

− deals with pipes having diameters ranging from 90 to 110 mm.