In boiler facilities for thermal power plants, various types of damage may occur from rapid
load change or as a result of the operation mode. Therefore, Mitsubishi Hitachi Power Systems,
Ltd. has developed non-destructive inspection technologies which enable the accurate and timely
detection of damage and has been promoting the application of these technologies to maintenance
work for actual boiler facilities. In this article, the outlines of the following developed inspection
technologies and the future prospects are described: thickness measuring technique by inner
UT/cable-less inner UT, corrosion thinning part inspection technique using tube-inserted ECT,
creep damage detection technique using phased-array UT, and thickness monitoring technique
using thin film UT.
