Shenhai e fakamoʻoni fakaʻauha
ʻOku ʻikai pikitai ʻa e kalasi ʻoku ou meʻangaue fakaʻuhila ki ha founga fakamaaka pau.
Ki he meʻangaue fakaʻuhila ʻa e kalasi II, ʻOku fakapapauʻi ʻa e fakafaʻahinga ʻe he faʻahinga kasa ʻoku velangofua. ʻOku toe fakafaʻahinga lahi ange ʻa e meʻangaue ko ʻeni ki ha faʻahinga fakamoʻoni ʻe tolu: IIA, IIB, mo e IIC.
ʻI he ngaahi ʻatakai ʻoku fakaʻaongaʻi ai e kalasi ʻoku ou meʻangaue fakaʻuhila, feituʻu combustible e ngaahi kasa kehe mei he methane ʻoku ʻi ai, talangofua ki he kalasi ʻoku ou mo e kalasi II ʻoku pau ke fakamoʻoniʻi ʻa e ngaahi tuʻunga moʻui.
Makatuʻunga ʻi he ngaahi koloa pau ʻo e fakafepakiʻi ʻatakai efu, ʻOku segmented ʻa e meʻangaue fakaʻuhila ʻa e kalasi III ki ha faʻahinga ʻe tolu: IIIA, IIIB, mo e IIIC.