Assuming a uniform pipe diameter in the steel pipes, the rated flow in the pump installed on the first floor of the basement was reduced by over 10% after 20 years had passed (C value of 90) moreover, the reduction in pressure and flow at its terminal head exceeded 30% and 16.5%, respectively.
#Gridded sprinkler system software#
This analysis was performed using the PIPENET software to perform hydraulic calculations in order to examine the flow and pressure at the terminal head when the corrosion coefficient was applied this coefficient was applied considering the aging of pipes. Among these, the steel and CPVC pipes, which are commonly employed in fire prevention, were considered for testing the reliability of the water-based systems. Piping materials used in fire prevention systems include carbon steel (for general or pressure pipeline), CPVC, copper, and stainless-steel. Consequently, the use of sprinkler facilities is increasing among water-based fire extinguishing systems.
With the recent enlargement and complication of buildings, damage caused by the incidents of fires breaking out are escalating. As for the required flow rate of the pump, the value directly calculated in this study is 3137 lpm, which is 99.81% of the value (3143 lpm) calculated by PIPENET computer program, indicating that the calculation procedure is accurate.
#Gridded sprinkler system manual#
The calculated value according to the manual hydraulic calculation procedure considering the velocity pressure presented in this paper is 12.9642 bar for pump demand pressure, and it is consistent with the value (12.96 bar) calculated under the same condition by the PIPENET computer program. 2) Flow is adjusted at the intersection point of the pipe where the branch pipe is connected and two different pressures are present. 1) the sprinklers discharge flow rate on the branch is calculated by the discharge flow rate equation due to normal pressure.
Two simple points can be summarized for the hydraulic calculation procedure considering the velocity pressure. Therefore, the procedure for the design considering the velocity pressure is explained in detail from beginning to end of the design. Understanding the design considering the velocity pressure is important because it is the actual situation that occurs in the pipe when calculating the friction loss. Theoretical calculation methods for hydraulic calculation of fire sprinkler systems considering the velocity pressure have been proposed however, there has been no specific application method to the design.
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