Chivundikiro cha dzenje chimayikidwa pamwamba ponyamula mafuta. Ndilo polowera mkati poyang'ana, kuyambiranso nthunzi ndi kukonza matanki. Itha kuteteza tanker ku ngozi zadzidzidzi.
Nthawi zambiri, valavu yopuma imatsekedwa. Komabe, pakatsitsa ndikutsitsa kutentha kwakunja kwamafuta, ndikutsika kwa tanker kudzasintha monga kuthamanga kwa mpweya ndi kuthamanga kwa zingalowe. Valavu yopumira imatha kutseguka ndikutulutsa mpweya wina ndi mpweya wamagetsi kuti tanki ipanikizike bwino. Ngati pangachitike zadzidzidzi monga momwe zinthu ziliri, zimangotseka zokha komanso zimatha kupewa kuphulika kwamatanki mukamayaka moto. Momwe valavu yotopetsa mwadzidzidzi imadzatseguka yokha pomwe kukoka kwamkati amgalimoto yamagalimoto kumakulira pamitundu ina.