(1) Marka loo eego heerka qulqulka dareeraha isku dhafan ee haanta hawada, waxaa loo qaybin karaa saddex nooc: nooca qulqulka riixida, nooca isku-dhafka dhamaystiran iyo nooca isku-dhafka wareega;
(2) Marka loo eego habka hawo-mareenka, waxa loo qaybin karaa haanta hawo-qaadista, haanta hawada hawada farsamaysa iyo haanta hawo-mareenka farsamaysan ee loo isticmaalo marka lagu daro labada;
(3) Marka loo eego qaabka taangiga hawada, waxa loo qaybin karaa afar nooc: marin leydi ah, wareegsan, labajibbaaran iyo dhabbaha dayuuradaha annular;
(4) Marka loo eego xidhiidhka ka dhexeeya haanta hawada sare iyo tan labaad ee sedimentation, waxa loo qaybin karaa laba nooc: dhismo wadajir ah (ie, haanta sedimentation hawo) iyo dhismo gaar ah.