Isifudumezi sepayipi sakhiwe ngesifudumezi sokucwiliswa esimbozwe yigumbi lomkhumbi wensimbi elivikela ukugqwala.Le casing isetshenziswa kakhulu ukuvikela ukulahleka kokushisa ohlelweni lokujikeleza.Ukulahlekelwa ukushisa akusebenzi nje kuphela ngokusetshenziswa kwamandla kodwa kuzodala nezindleko zokusebenza ezingadingekile.