Iibhayisekile zeeseli zepetroli zibonelela ngezibonelelo ezibonakalayo ngaphezulu kweebhayisekile zebhetri yombane ngokoluhlu kunye nokugcwalisa. Ngelixa iibhetri zihlala zithatha iiyure ezininzi ukuphinda ziphinde zisebenze, iisilinda zehydrogen zinokugcwaliswa phantsi kwemizuzu emi-2.