Treatment plant and method for designing treatment plant

A method of designing a treatment plant for handling a flammable fluid, the method comprising:

• a step of determining positions at which a plurality of equipments configured to handle the flammable fluid are arranged for an equipment placement region of a site of the treatment plant;
• a step of dividing the equipment placement region into four or more firewater supply sections so that the firewater supply sections include the equipments, respectively;
• and
• a step of determining, for each of the firewater supply sections, installation of a plurality of fire-extinguishing water supply facilities having a capacity to, when a fire occurs in one of the equipments placed in the firewater supply sections, simultaneously supply fire-extinguishing water to a fire-occurrence section corresponding to a firewater supply section among the four or more firewater supply sections in which the fire has occurred and an adjacent section being a firewater supply section among the four or more firewater supply sections that is less than a preset safety clearance distance away from the fire-occurrence section,
• wherein the preset safety clearance distance prevents the spread of fire across the preset safety clearance distance,
• wherein, in the step of dividing the equipment placement region, the equipment placement region is divided so that a distance from the fire-occurrence section to a second firewater supply section next to the adjacent section always becomes equal to or larger than the preset safety clearance distance when any of the four or more firewater supply sections becomes the fire-occurrence section,
• wherein the treatment plant is a plant, that handles the flammable fluid or performs a treatment using the flammable fluid.