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In order to unify the boundary conditions for various pipe elements and to simplify the computer code, the one-dimensional boundary conditions for three-way junction are extended to those for some pipe elements such as a nozzle and an elbow. To examine whether the extended boundary conditions are useful or not, the pulsatile flow through the pipe with the nozzle or elbow are numerically simulated using a Random-Choice Method and then the results are compared with those by the experiments. As a result, good agreement was found between experiments and calculations as long as the pressure histories are concerned and the extension of the boundary conditions is found to be valuable.