Although the allowable external pressure for branch pipe connections is estimated by evaluation procedure for straight pipe, the applicability of procedure for straight pipe to branch pipe connections has not been clear. The applicability of evaluation procedure for straight pipe to branch pipe connections regarding to evaluation of allowable external pressure evaluation was discussed in this study. The buckling pressure of branch pipe connections was estimated by linear eigenvalue analysis with FEA (Finite Element Analysis). The types of branch pipe connections were T-joints and T-pipes. The range of configurations in branch pipe connections for FEA, such as ratio of outer diameter in main to branch pipe D/d and ratio of outer diameter to thickness in main pipe D/T, were determined by survey of branch pipe connections in the Japanese nuclear power plants. The results of the FEA showed that the buckling strength of branch pipe was found sufficiently to be superior than that of straight piping from comparisons of estimations by FEA for branch pipe connections and those by formula for straight pipe in the design code. It was concluded that the formula for straight pipe is applicable for the evaluation of allowable external pressure for branch pipe connections.

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