The torsional mode T(0,1) of guided wave is generated to detect the defects in pipeline. However, since many pipes of interest are supported with clamp for the necessary of manufacturing process in refinery and petro-chemical industrials. The effect of the clamp support mounted on the pipe for guided wave propagation is investigated by both simulative and experimental method. The wave structures of T (0,1) mode in the pipes are studied for the clamp with and without the rubber gasket to evaluate the influence of the guided wave propagation on the pipe. The amplitude of the reflected signals from the clamp support and the flange feature on the pipe are also measured under various torque s setting for attenuation calculation. Good agreement between the experiments and predictions for all cases of various torques setting on the clamp with and without the rubber gasket is obtained. The results show that the attenuation of the clamp support with rubber gasket is heavier than the case of clamp support without rubber gasket is, and the higher torque setting the higher amplitude of the reflected signal for the guided wave propagation. In addition, the effect of frequency excitation is demonstrated in this paper. It is the higher amplitude of reflected signal the lower frequency excitation.
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