抄録
An angle of a circumferential flaw in JSME's Fitness-for-Service Codes was restricted considering a measurement error of the flaw. In this study, pipe fracture probability were evaluated changing a flaw angle and a pipe diameter, and influence of some parameters on failure probability was examined. As a result, it was revealed that the influence of measurement error of the flaw depth is the biggest factor especially for the cases of long and deep flaw. To control failure probability at the same level as the conventional standard, it is the most effective to improve flaw measurement accuracy soast to depend on pipe thickness. Even in this case, the influence of the measurement error cannot be ignored when flaw is long and deep. Therefore, it is necessary to restrict the flaw depth according to the flaw angle, but this restriction is relaxed remarkably compared with the conventional one.
