In order to find out the causes leading to leakage in condenser

an eddy current detection of tubes around the already leaked titanium tube in the condenser has been carried out.Combining with two typical eddy impedance signals

a calibration curve

which can accurately calculate the thickness reduction of titanium tubes

has been made by using the functions of standard detection procedure.Results of test show that:in addition to the mechanical impact and hurt of hard matters are easily resulted in titanium tube leakage in the condenser

the perpendicularity in installation of supporting plates and the concentricity of every row also affect the mounting gaps between the supporting plates and the titanium tubes

resulting in leakage of titanium tubes due to impact damage between titanium tubes and supporting plates

as well as the stress produced in start-up and shutdown of the units.