- Rapport
- Värme och kyla
Effects of mechanical loads on ageing of prefabricated district heating pipes
| 2025:1141 | Jan Henrik Sällström RISE, Ignazy Jakubowicz RISE, Nazdaneh Yarahmadi RISE
The project has investigated how today’s district heating networks can continue to be used over a long period by identifying when and where pipes need to be replaced, in order to avoid unnecessary reinvestments and environmental impact.
The focus has been on pre-insulated steel district heating pipes, with particular emphasis on how mechanical loads accelerate degradation. The study analysed deterioration in the field, especially where the insulation separates from the media pipe, which can lead to fatigue and leakage. Experiences from other failure mechanisms have also been compiled. In parallel, new methods have been developed for assessing lifespan and status, through laboratory testing, to enable smart maintenance and selective replacement of worn-out components. The aim was a more reliable calculation model for remaining service life based on actual field conditions.