Corrosion Rate Monitoring in District Heating Systems

Lisbeth Rischel Hilbert, Lars Vendelbo Nielsen, A. Andersen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    Quality control in district heating systems to keep uniform corrosion rates low and localized corrosion minimal is based on water quality control. Side-stream units equipped with carbon steel probes for online monitoring were mounted in district heating plants to investigate which techniques would be applicable, and if on-line monitoring could improve the quality control. Water quality monitoring was applied as well as corrosion rate monitoring with linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS), electrical resistance (ER) technique, mass loss and a crevice corrosion cell for localized corrosion risk estimation. Important variations in corrosion rate due to changes in make-up water quality were detected with the continuous monitoring provided by ER and crevice cell, while LPR gave unreliable corrosion rates. The acquisition time of two-three days for EIS measurements was too long for real time data, and reliable mass loss data could only be obtained after 6 months exposure. It was furthermore found that localized corrosion events detected by the carbon steel crevice corrosion cell correlated with oxygen peaks of even a few hours duration.
    Original languageEnglish
    Title of host publicationCorrosion2005
    Publication date2005
    Publication statusPublished - 2005
    EventCorrosion 2005 - Houston, TX, United States
    Duration: 3 Apr 20057 Apr 2005


    ConferenceCorrosion 2005
    Country/TerritoryUnited States
    CityHouston, TX
    Internet address


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