JIS B 2251 (former HPIS Z 103 TR) is published as the assembly guidelines for bolted flanged joints with ring-type gasket, which employs the rotational clockwise tightening sequence in the main tightening step. Actual flanged joints have misalignment, and when the flanged joints are assembled, the bending moment to modify the influence of the misalignment acts on the flange faces. There is risk that the uniformity of gasket stress distribution is affected by the bending moment of the misalignment. So, the influence of the misalignment on the uniformity of the gasket stress distribution is investigated using finite element analysis. Consequently, setting the acceptance criteria of the misalignment to get the uniformity of gasket stress distribution. The influence of the uniformity of the gasket stress distribution in case of changing the starting tightening bolt against the direction of the misalignment is also investigated.

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