NS-EN ISO 20769-2:2018 無損檢測 通過 X 射線和伽馬射線對管道中的腐蝕和沉積物進行射線照相檢查 第2部分:雙壁射線照相檢查 (ISO 20769-2:2018)
Non-destructive testing - Radiographic inspection of corrosion and deposits in pipes by X- and gamma rays - Part 2: Double wall radiographic inspection (ISO 20769-2:2018)