The present work deals with the vibrational characteristics of a Y-shaped tube conveying flowing fluid. The tube is considered to be composed of 3-stright tube segments mathed at the intermediate junction. The governing equation of straight tube conveying fluid is used with each of the three segments. This work introduce the clamped-pinned and clamped free boundary conditions. The coupled effects of the type of boundary conditions, angle between the two Y-segments, fluid velocity and length ratio of segments on the dynamics of the tube are studied. It seen that the Y-tube loses its stability at flow velocity higher than that for straight tube of the same characteristics.

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