Leakages on four kinds of tubes in utility boilers is the main cause affecting safe operation of the power grid.Three methods used at present for monitoring leakage on four kinds of tubes in boilers are:traditional method

filtering method

and audible specturm method.Among them

the audible spectrum method is most commonly used

but this method has low sensitivity

and its sound transducer bing easy to damage.For this

a special acoustic resonator type sound transmission tube has been designed.Through test

it shows that the said tranmission tube can strengthen the leakage signal

and can accurately and effectively collect leakage signal

having higher sensitivity

avoiding the influence of flame and hot gas upon the transducer under positive pressure in the boiler

reducing the maintenance cost for leakage monitoring system regarding four kinds of tubes in boilers.