Renovation of the technical gallery network at CERN

The distribution of services throughout a large scientific facility like CERN relies on a 14-km-long network of technical galleries. They provide essential utilities to CERN's office buildings and technical facilities, such as hot water, drinking water, compressed air, gas and electrical supply. This network has been gradually expanded or partially discontinued based on the Laboratory's needs. After 60 years of service, it is now time to refurbish the galleries and their associated infrastructure, to address existing issues and establish a robust foundation for the organization's future endeavors. A dedicated project has therefore been launched to enhance the maintainability, reliability, overall safety, and environmental performance of the technical infrastructure. Adapting all the networks to current and future needs following modern standards while minimizing service disruptions is also a priority. This paper provides insight into the methodology developed to re-engineer the targeted areas, the results of design studies, and lessons learned from implemented improvements. These insights may serve as a valuable example for other consolidation projects within CERN and beyond.