Igice cyo Gutandukanya Ikirere (ASU) ni igikoresho gikoresha umwuka nk'ibiryo, guhonyora no gukonjesha cyane kugeza ku bushyuhe bwa kirogenike, mbere yo gutandukanya ogisijeni, azote, argon, cyangwa ibindi bicuruzwa biva mu kirere biva mu kirere binyuze mu gukosora. Ukurikije ibyo umukoresha akeneye, ibicuruzwa bya ASU birashobora kuba bimwe (urugero, azote) cyangwa byinshi (urugero, azote, ogisijeni, argon). Sisitemu irashobora kubyara ibicuruzwa byamazi cyangwa gaze kugirango byuzuze ibyifuzo bitandukanye byabakiriya.