subject: Ultrasonic Flowmeters: The Crowning Jewel Of Flowmeters [print this page] There is also a built-in acoustic discontinuity in copper, concrete-lined, plastic-lined, and fiberglass-reinforced pipes, which are significant enough to either completely, scatter the transmitted signal or attenuate the return signal. This dramatically decreases flowmeter accuracy and most of the time clamp-on meters will not work at all if the pipe is lined.
Ultrasonic Flowmeters: The Crowning Jewel Of Flowmeters