Abstract
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. 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. Therefore, the procedure for the design considering the velocity pressure is explained in detail from beginning to end of the design. Two simple points can be summarized for the hydraulic calculation procedure considering the velocity pressure. 1) the sprinklers discharge flow rate on the branch is calculated by the discharge flow rate equation due to normal pressure. 2) Flow is adjusted at the intersection point of the pipe where the branch pipe is connected and two different pressures are present. 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. 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.
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