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概要

The new Code Case to substitute the allowable crack angle for a circumferential surface crack in “Rules on Fitness-for-Service (FFS)” published from The Japan Society of Mechanical Engineers (JSME). Until now, th e angle of a circumferential surface crack was limited below 60°. This is the limitation with consideration to the stability of the crack if the deep crack penetrates wall of the pipe. Therefore, a long crack (su ch like an SCC) was obliged to repair or replace even if it was shallow enough. Weld Overlay (WOL) repair in which strength of the original piping is ignored is also inapplicable for the same reason. In order to solve this irrationality, the new Code Case applying to the crack stability assessment when the crack angle exceeds 60° was established, and allowable crack depth according to the crack angle were defined in it.

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