Standard for Installation of Fire Safety Devices based on Use and Occupancy Article 214

Installation of foam fixed outlet shall be equipped according to the preceding Article and the installation of supplementary foam hydrants and liquid-feeding orifices shall comply with the following subparagraphs:1. Supplementary foam hydrant shall correspond to the following subparagraphs:(1) The hydrant shall be installed in a place where the distance between hydrant and the dike of storage tank is at least 15 m, convenient for firefighting, the walking distance to any foam hydrant is less than 75m, and the outlet volume of foam nozzle is more than 400l/min with the discharging pressure more than 3.5kg/cm2 or 0.35MPa. When more than 3 foam hydrants are utilized simultaneously, all related values shall be calculated as of 3 units in use.(2) The installation of auxiliary hose of supplementary foam hydrant shall apply mutais mutandis to the case as referred to in Article 40.4.2. The necessary quantity of liquid-feeding orifices shall be calculated using the formula provided below:N=Aq/CN: the necessary quantity of liquid-feeding orificesA: the maximum cross section horizontal area of the storage tank. However, in the case of floating top storage tank, the annular area may be used for calculation purpose (m2)q: the discharging quantity per square meter of fixed qtype foam outlet (l/min m2)C: the standard feeding rate of each liquid-feeding orifice (800l/min)