G - Physics – 01 – B
Patent
G - Physics
01
B
G01B 17/02 (2006.01) G01N 29/18 (1995.01)
Patent
CA 2246075
A pipe (P) carries corrosive fluids (F). Ultrasonic measurements of the pipe's thickness are made with an instrument (10) to determine if it needs to be replaced. If the pipe is coated with a layer (L) of protective material (C), a time of flight (TOF) measurement is made to determine the velocity of ultrasonic pulses transmitted through the material from which the pipe is manufactured. A second measurement is made to determine the velocity of pulses through the coated pipe material. The pulse velocity is now a function of the coating thickness by knowing the two velocity values, the coating thickness is determined. An ultrasonic pulse measurement of the thickness of the coated pipe is then made. The coating thickness is then calculated by a processor (12) of the instrument. If the thickness value is less than a minimum thickness value (M), an indication is given that the pipe needs to be replaced.
Borden Ladner Gervais Llp
Emerson Electric Co.
Ge Inspection Technologies L.p.
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