District heating and district cooling pipes - Bonded single and twin pipe systems for directly buried hot and cold water networks - Part 1: Qualification testing of fitter

This document specifies the methods of examining the knowledge and skill set of the fitter required to carry out on-site joint casing connections on thermally insulated single and twin pipe systems for directly buried hot and cold water networks according to EN 13941-2[14]. The application of these specified methods specifications ensures that the examination is carried out according to a standardised examining procedure. This document covers the following processes: - preparatory works for joint casing assembly; - assembling and testing the elements for surveillance systems; NOTE For special surveillance systems it can be important to have additional training. - preparing work for joint casing system installation; - assembling sealable joint casing system; - verifying joint tightness (leakage testing); - thermally insulating the joint casing (PUR foaming or half-shells); - sealing fill & vent openings (weldable or sealable plugs); - assessing overall installation quality of the completed joint connection (non-destructive).