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In order to study the influence factors of suction fish pipe erosion phenomenon, based on turbulence theory and Finnie, DNV, E/ CRC erosion models, the COMSOL finite element model was established to calculate and analyze the erosion law of suction fish pipe under the conditions of bend angle, input pipe length and intermediate pipe length. The results show that when the bending angle increases gradually, the maximum erosion velocity increases firstly and then decreases. When the bending angle is 60°, the maximum erosion rate is reached. With the increase of elbow angle, the maximum erosion position of the pipe gradually shifts from the outer area of the inner wall at the junction of the pipe segment and the elbow to the outer part of the inner wall of the elbow. With the increase of the length of the input pipe, the maximum erosion rate decreases gradually, and the decreasing rate of erosion rate tends to be gentle. When the length of intermediate pipeline is small, the effect of the offset erosion rate is small, and the maximum erosion rate decreases with the increase of the length of intermediate pipeline.
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