Absrtact:Due to the particularity of the transportation medium,the wall temperature of some high-temperature boiler pipelines can reach 500℃,so the thick coated layer is often configured to achieve the thermal insulation.Considering that it is inconvenient to stop and difficult to remove the ccoated layer,conventional methods can not achieve its on-line wall thickness measurement.In this paper,a simulated sample of the High-temperature boiler pipeline is used as the test object.Under high temperature conditions,the transient electromagnetic method(TEM)without removing the coated layer and the electromagnetic ultrasonic testing with partial removal of the coated layer are applied to achieve the preliminary screening of abnormal positions of pipeline wall thickness,and then to carry out precise measurements.Based on this,a set of methods of wall thickness measurement for high-temperature boiler pipelines are provided,which can realize on-line wall thickness detection of high-temperature boiler pipeline.
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