Abstract: In order to give full play to the role of the fixed fire extinguishing system, effectively shorten the fire extinguishing time, improve the fire extinguishing efficiency of flammable liquid tank fires, and reduce the threat of fire to the life safety of firefighters, this paper systematically investigated the layout of the fixed foam fire extinguishing system pipe network of domestic built fixed roof tanks and external floating roof tanks and the layout of the pipe network of the fire cooling water system, and analyzed the advantages and disadvantages of different layout methods, suggestions for the design and improvement of fixed fire extinguishing systems in combustible liquid storage tank areas have been proposed.

Key words: combustible liquid storage tank, pipeline arrangement；fixed foam fire extinguishing system, fire cooling water system