An Air Separation Unit (ASU) ndi chipangizo chomwe chimagwiritsa ntchito mpweya monga chakudya, kuupondereza ndi kuuzizira kwambiri mpaka kutentha kwa cryogenic, asanalekanitse mpweya, nayitrogeni, argon, kapena zinthu zina zamadzimadzi kuchokera mumlengalenga wamadzimadzi pokonzanso. Kutengera zosowa za wogwiritsa ntchito, zopangidwa ndi ASU zitha kukhala zamtundu umodzi (mwachitsanzo, nayitrogeni) kapena zingapo (mwachitsanzo, nayitrogeni, mpweya, argon). Dongosololi limatha kupanga zinthu zamadzimadzi kapena gasi kuti zikwaniritse zosowa zosiyanasiyana zamakasitomala.