Abstract:In order to improve the safety and reliability of technical water supply system of the Xiaolangdi Project, technical water supply system transformations to two units that combining the unit Alevel maintenance were conducted. This paper introduced five optimized transformations of water supply pipes, valves, pressure reducing valves, water filters and pipeline anticondensation, and proposed corresponding countermeasures to the construction difficulties, which provided a reference for the optimized transformations of other largescale hydraulic projects.

Keywords:technical water supply system, leakage, pipe welding, pipe connecting, anti condensation