Standard for Installation of Fire Safety Devices based on Use and Occupancy Article 220

The water source volume for foam fire-suppression equipment shall be more than the water quantity required for the solution prescribed below and the volume of solution required in the pipe shall also be regarded.1. When foam nozzle is utilized, the required water volume shall be equivalent to the volume of spraying with the largest spraying area for 10 consecutive minutes.2. When foam based hydrant utilized, the required water volume shall be more than the water volume discharged by four nozzles for 30 consecutive minutes simultaneously. When less than 4 nozzles are utilized, the actual amount of nozzle shall be used for calculation. The discharging rate for foam based hydrant installed indoor shall be more than 200 l/min and more than 400 l/min if installed outdoor.3. When foam monitor is utilized, the required water volume shall be equivalent to the volume discharged by two monitors for at least 30 consecutive minutes.4. The methods for calculating the water volume for the foam fixed fire-suppression equipment used for storage tank are stated as following:(1) The water volume required for foam fixed outlet shall be calculated by multiplying the quantity of foam solution prescribed in the table under the Article 213.2 and 213.3by the surface area of the liquid during maximum discharging volume.(2)The water volume required for supplementary foam based hydrant shall be the volume equivalent to the discharging quantity at the rate prescribed under the Article 214 for 20 consecutive minutes.