Isembozo somgodi sifakwe ngaphezulu kwetanki likawoyela. Kungukungena kwangaphakathi kokulayisha, ukubheka ukuvuselelwa komphunga nokugcinwa kwamathangi. Ingavikela i-tanker ezimeni eziphuthumayo.
Imvamisa, i-valve yokuphefumula iyavalwa. Kodwa-ke, lapho ulayisha futhi uthule uwoyela wangaphandle ushintsho, nengcindezi yetanki lizoshintsha njengokucindezela komoya nokucindezela komshini. I-valve yokuphefumula ingavuleka ngokuzenzekelayo ekucindezelweni okuthile komoya nokucindezela komshini ukwenza ingcindezi yethangi ibe sesimweni esijwayelekile. Uma kunesimo esiphuthumayo njenge-roll over situation, izovala ngokuzenzakalela futhi ingagwema nokuqhuma kwamathangi lapho kusha. Njengoba i-valve ephuthumayo ephuthumayo izovuleka ngokuzenzekelayo lapho ingcindezi yangaphakathi yamaloli ethangi inyuka iye ebangeni elithile.