METHOD AND APPARATUS FOR DETERMINING THE HEALTH AND REMAINING SERVICE LIFE OF AUSTENITIC STEEL REFORMER TUBES AND THE LIKE

摘要

Inspection method and apparatus for checking the health of steel tubes used in reformers and other tubes and pipes used in other high temperature applications. The method comprises the steps of transmitting two sine wave electromagnetic signals each having different frequencies F ₁ and F ₂ to a reformer tube, receiving a response signal, and analyzing the intermodulation frequencies of the received response signal to And determining the state.