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Lifetime predictions and status assessments of district heating pipelines

| 2022:872 | Ignacy Jakubowicz, Jan Henrik Sällström, Alberto Vega, Nazdaneh Yarahmadi
The project has focused on district heating pipes built up of steel service pipes, polyurethane insulation (PUR) and polyethylene casing. The project had two main objectives: A field method should be developed to measure the status of district heating pipelines regarding shear strength and an interna­tionally accepted methodology for service life prediction with respect to lost adhesion would be presented.
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A field method (RISE plug method) to assess the status of district heating pipelines in operation has been developed in the project. The method measures the adhesive strength (shear strength) between the insulation and the service pipe. The field method has been supplemented with a chemical analysis of removed insulation in the laboratory. A method to compare service time at a selected reference temperature for different district heating pipelines has been presented.

About methodology for service life prediction, the research situation has been determined through a literature review. A platform for international con­tinued collaboration has been created together with others within the IEA DHC for continued research on methodology for lifetime prediction of pre-insulated district heating pipelines.