Abstract: As for the developing trend of large - scale floating roof tanks in China, the mobile large - flow fire monitor combined with remote water supply system is the main way to deal with full surface fires outside of China. The fixed and mobile liquefied nitrogen foam system have been studied for Chinese oil depots. According to results of the compressed air foam spraying and firefighting tests on large - scale oil pan, the foam spraying pipes fixed at one site on top of tank shell is better for extinguishment of full surface fire than for other means. The combination of mobile large - flow liquefied nitrogen foam system and semi - fixed foam spraying pipes on floating roof tanks is suitable for extinguishment of full surface fires, considering the distribution and amount of floating roof tanks in China.

Key words: floating roof tank, full surface fire, liquefied nitrogen foam system