Mapangidwe a chowongolera okhala ndi chotchingira chotsekedwa (muyezo) ndi chowongolera chotseguka kutengera kugwidwa(ZGPO).Kutsatira koyenera kosiyanasiyana kogwirira ntchito, kotsekera kotsekera komwe kumakhala kothandiza kwambiri, mikhalidwe yotsika ya NPSHr yotsegula chopondera cha zakumwa zamafuta kwambiri, ndende yolimba kwambiri (mpaka 10%), mapampu okhala ndi NPSHr otsika kwambiri.