초음파탐상검사 규격초음파비파괴검사기사 · 2014년03월02일 · 72/80
72.보일러 및 압력용기에 대한 표준초음파탐상검사(ASME Sec. V, Art.23 SB-548)에서 알루미늄 합금판을 수침법으로 검사할 때 탐촉자와 시험체 사이의 거리 허용변동 범위는?
1
±25.4mm
2
±8.5mm
3
±6.4mm정답
4
±3.2mm
해설
[ASME BPVC Sec.V(2021) Art.23, SB-548] 8.1.1 Maintain the couplant distance so that the second couplant reflection is to the right of the first back reflection on the instrument’s A-scan display. The couplant path shall not vary more than ±1/4 in. (6.4 mm) during calibration, initial scanning, and discontinuity evaluation.