A study on the effects of Friction loss of CPVC pipe according to Roughness coefficient in a sprinkler system

스프링클러 시스템에서 조도계수에 따른 CPVC 배관 마찰손실 영향의 연구

  • Kang, Ung Il (Department of fire Service Administration, Honam University)
  • 강웅일 (호남대학교 소방행정학과)
  • Received : 2016.09.26
  • Accepted : 2016.11.10
  • Published : 2016.11.30


The pipe material is selected according to the physical and chemical properties of the fluid flowing within it. Because the fluid used in fire extinguish systems is water, the various foreign substances dissolved in it cause scale to form on the pipe wall and accelerate the corrosion and aging of the pipe itself. This results in an increase in the friction loss and eventually degrades the efficiency of the pump. The use of CPVC (Chlorinated Poly-Vinyl Chloride) pipes was confirmed to reduce the friction loss compared to conventional steel pipes in the design and construction stages. The friction loss was found to be 76.64MPa with a C-value of 120 for the steel pipe and 50.72 MPa with a C-value of 150 for the CPVC pipe in an actual apartment construction environment. It was confirmed that the friction loss was improved by about 34% when using the CPVC pipe. When the steel and CPVC pipes were employed in the construction, the construction costs were 1,585,158 and 931,842 won, respectively. Therefore, it was shown that the construction cost was reduced by about 41%. We investigated the safety of the fire extinguishing system and the improvement in the economic performance due to the reduction in the total installed capacity by studying practical applications in the field.


Construction cost;Chlorinated Poly-vinyl chloride;Economic improvement;Friction losses;Pipe material


Supported by : 한국전력공사


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