Anti-freeze Application in Fire Extinguishing Facility Piping for a Warehouse Building

Abstract

This study aims to test the effect of temperature-rise on fire extinguishing facility piping by means of the flow method using an antifreeze solution and the circulation method by the heat of the pump to secure. The results of the experiment showed that the insides of the pipe freeze at -7 ℃ at a concentration of 20% antifreeze and -4 ℃ at 10%. When tested with the flow velocity of the antifreeze maintained at 1 m/s and concentrations of 20%, 10%, and 0%, the temperatures rose by 1.8 ℃, 0.6 ℃, and 1.7 ℃, respectively. At a velocity of 2 m/s, the temperatures rose by 2.1 ℃, 3.1 ℃, and 0.9 ℃. In addition, the circulation method test, by operating of the pump, increased the temperature by 1.2 ℃ with a pressure of 0.9 kgf/cm² and flow rate of 120 LPM. The pressure of 2.5 kgf/cm² and flow rate of 200 LPM increased the temperature by 2.7 ℃. Finally, a novelfreeze protection method was proposed to maintain the setup above freezing point due to the friction heat generated between the impeller of the pump and water.