The project planned the replacement of channel-laid hot water pipelines with ductless pre-insulated hot water pipelines with a total length of 68.5 km and a range of different nominal diameters from DN 20 to DN 800. Theexisting dimensions of the pipelines were retained on the sections planned for revitalization on parts of the route of the existing hot water network CTS of the City of Zagreb. , that is, on parts of hot water mains and distribution networks within the built-up areas of urban settlements of the City of Zagreb: Siget, Sopot, Trnsko, Utrine, Donji grad, Folnegovićevo naselje, Kruge, Vrbik, Savica, Borovje, Sigečica, Gajevo Staglišće, Jarun, Srednjaci, Cvjetno naselje , Trešnjevka and Voltino.
The importance of this project for the City of Zagreb and its residents is best illustrated by the data that HEP Toplinarstvo d.o.o. performs energy activities of production, distribution, and supply of thermal energy in the area of the City of Zagreb and manages a hot water distribution network 227.3 km long.
More than half of the hot water network in the City of Zagreb (56.2%) was built between 1962 and 1995, using the classic method of laying steel pipes in a concrete channel. Such technology is outdated and subject to externalinfluences such as a high level of underground water, possible leakage of water pipes and the penetration of rainwater into concrete channels, which favors the deterioration of pipes and the occurrence of corrosion. The consequence of the previously described problem is the constant growth of heat losses and water replenishment losses, as well as a large number of emergency interventions in the last few years.
The implementation of this project will result in a reduction of heat losses by 27.94%, a reduction of water replenishment losses by 47.36% and a reduction of the number of emergency interventions on the reconstructed sections of the spring by 90% compared to the state before reconstruction. The reduction of heat losses will result in less production of heat energy in power plants, and thus the reduction of emissions of harmful substances into the environment (CO2, NO2, SO2 and PM10), which will have a favorable effect on society.
The project is co-financed by the European Union.
