| 摘要 |
<p>A duct ( 10 ) for use in an ultrasonic treatment plant is made from a cylindrical steel pipe ( 12 ) by plating the bore with a corrosion-resistant metal layer ( 14 ). This is preferably done by honing the bore to ensure that it is circular, plating the bore of the pipe ( 12 ) with the corrosion-resistant metal, and again honing the bore of the pipe to ensure that it is circular and to reduce the thickness of the corrosion-resistant metal, and coupling ultrasonic transducers ( 16 ) to the outside of the pipe ( 12 ). Where flanges ( 22 ) are attached to the ends of the pipe ( 12 ), these are fitted over each end of the pipe so the ends are flush, and welded to the outside of the pipe ( 12 ).</p> |
