A cikin tsire-tsire masu rarraba iska na ruwa, samfurin rabuwa shine ruwa oxygen ko nitrogen.Ka'idar ita ce kamar haka: matsa lamba, an shigar da iska mai sanyi a cikin ginshiƙi don shiga cikin gyarawa, H.2O da CO2ana cire su ta hanyar juzu'i mai ɗaukar kwayoyin halitta, sanyaya zuwa zafin jiki a cikin matsakaicin matsa lamba mai zafi, sa'an nan kuma an gabatar da su a cikin ginshiƙi don shiga cikin gyarawa.Ana amfani da faɗaɗa mai girma da ƙananan zafin jiki da kwampreso mai zagayawa don samar da makamashin sanyi don samun ruwa oxygen da samfuran nitrogen.
Tsire-tsire masu rarrabuwar ruwa yawanci sun haɗa da matattarar iska, tsarin sanyaya iska, tsarin tsarkakewa na kwayoyin halitta, babban mai faɗaɗa zafin jiki da ƙarancin zafi, injin damfara mai juyawa, injin daskarewa na cryogenic, tsarin ginshiƙan juzu'i, da tsarin ajiya.