Heat-supply Pipeline Magnetic-thermal Comprehensive Test Method

A magnetic-thermal comprehensive test method was proposed for the leakage of directly buried urban heat-supply pipeline that occurs during operation. The main features of this method included non-excavation, in-service inspection and rapid positioning, etc. According to the structural characteristics and leakage characteristics of directly buried heat-supply pipe, suspicious areas can be identified by infrared temperature measurement technology, and the level of damage to the pipeline can be tested by micro-magnetic technology. After developing the instrument and conducting real test, the test results were verified by excavation. The results show that the correct rate of magnetic-thermal comprehensive test method on the leakage of directly buried urban heat-supply pipe can reach 90%, and the location precision was within 0.5 meter. The study provided practicable method for heat-supply pipes leakage location detection.