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Proceedings Paper

Predictive maintenance of district heating networks by infrared measurement
Author(s): Lasse Koskelainen
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Paper Abstract

District heating pipelines are often exposed to very hard conditions in their environment. External and sometimes also internal corrosion may soon damage the steel pipes and the ground water may damage the thermal insulation. The planned period of utilization is about 20 to 30 years, but it may also be considerably longer if the pipelines are well maintained. The goal of this project was to develop a measuring system so that potential leak points could be located as early as possible. A method is developed for analyzing the condition of underground district heating pipelines. The method is based on the infrared measurement of the ground surface temperature. The measurement is made by using a mobile infrared scanner which is fixed to a car. The analysis is carried out by using the mobile equipment and a system for image processing. The system is connected to the preventive maintenance data system and the network maps. The infrared video recording is processed to produce a longitudinal temperature distribution curve of the ground above the district heating culvert. The temperature distribution is compared to the network map in order to distinguish the 'normal' temperature peaks from the exceptional ones. The maintenance data system uses an image data base so that the temperature curves of previous measurements can be used for comparison. The reliability of the measurement system was evaluated by making a series of tests and comparative measurements in a test field in which all the most common types of damage were constructed and run for about two years. The test field was run in controlled conditions in order to find out how soon and how well the different kinds of faults could be detected in ground surface temperature.

Paper Details

Date Published: 1 April 1992
PDF: 8 pages
Proc. SPIE 1682, Thermosense XIV: An Intl Conf on Thermal Sensing and Imaging Diagnostic Applications, (1 April 1992); doi: 10.1117/12.58528
Show Author Affiliations
Lasse Koskelainen, Lappeenranta Univ. of Technology (Finland)

Published in SPIE Proceedings Vol. 1682:
Thermosense XIV: An Intl Conf on Thermal Sensing and Imaging Diagnostic Applications
Jan K. Eklund, Editor(s)

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