Pahū ʻo Shenhai
ʻAʻole pili nā lako uila papa I i kahi ʻōnaehana helu kikoʻī.
No ka papa II lako uila, Hoʻoholo ʻia ka hoʻokaʻawale ʻana e ke ʻano o ke kinoea lapalapa i loaʻa. Hoʻokaʻawale ʻia kēia mea hana i ʻekolu mau ʻano pahū: IIA, IIB, a me IIC.
I nā kaiapuni e hoʻohana ana i nā lako uila Class I, kahi o nā kinoea hoʻopau ʻē aʻe methane aia i laila, ʻO ka hoʻokō ʻana i nā kūlana hōʻoia pahū o ka Papa I a me ka Papa II he koi.
Ma muli o nā waiwai kiko'ī o ka pahū lepo lepo, Hoʻokaʻawale ʻia nā lako uila papa III i ʻekolu mau ʻāpana: IIIA, IIIB, a me IIIC.