A Study on the Plastic deformation Absorption Characteristics of Aluminum-Polyethylene Composite Structure Sprinkler Pipe

알루미늄 합성수지 복합 구조 스프링클러 파이프의 변위 흡수 특성 연구

  • Kim, Jun-Gon (Department of Port Logistics System, TongMyong University) ;
  • Kim, Kwang-Beom (Technical Laboratory, MISUNG Co., Ltd) ;
  • Noh, Sung-Yeo (Department of Port Logistics System, TongMyong University)
  • 김준곤 (동명대학교 항만물류시스템학과) ;
  • 김광범 (주식회사 미성 기술연구소) ;
  • 노성여 (동명대학교 항만물류시스템학과)
  • Received : 2018.11.29
  • Accepted : 2019.01.04
  • Published : 2019.01.31


After an earthquake, fire and gas explosions are more likely to cause more casualties in cities with many apartment buildings and large complex buildings. In order to prevent this, seismic design is necessary for the fire protection sprinkler system. However, most systems currently use stainless-steel pipes, although synthetic resin pipes are used in some special places. These materials are susceptible to vibration and earthquakes. This study evaluated the displacement absorption flexibility of polyethylene (PE) and aluminum (Al) multi-layered composite pipes to increase the seismic performance in a vibration environment and during earthquakes. The seismic performance was compared with that of a stainless-steel and PE pipes. The seismic characteristics can be measured by measuring the amount and extent of vibration transmitted by the sprinkler pipe. This method can be used to judge the seismic characteristics to attenuate the vibration during an earthquake. The seismic characteristics of the pipe were verified by comparing the logarithmic attenuation rate to the initial response displacement of the vibration generated by the transverse vibration measurement method.


Deformation absorption;Fittings;Piping;Seismic Design;Sprinkler

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Fig. 1. Damage of piping due to earthquake, (a) Perpendicular pipe damage, (b)Connect pipe damage, (c)Sprinkler pipe damage, (d)Sprinkler pipe downfall

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Fig. 2. Composite Pipe structure

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Fig. 3. Seam welding Pipe manufacturing process

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Fig. 4. Composite Pipe manufacturing process

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Fig. 5. Optical microscope photo (a) STS 304 stainless still pipe, (b)PE Pipe, (c)Aluminum weld of Composite Pipe

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Fig. 6. Results of pipe tensile strength test

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Fig. 7. Results of pipe booster water pressure test

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Fig. 8. Results of micro vickers test

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Fig. 9. Vibration-free damped waveform

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Fig. 10. Vibration damped waveform of pipe structure (a) STS 304 stainless still pipe, (b) PE Pipe, (c) Aluminum weld of Composite Pipe

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Fig. 11. Vibration damped waveform of plate structure (a) STS 304 stainless still pipe, (b) PE Pipe, (c) Aluminum weld of Composite Pipe

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Fig. 12. Test result of vibration damping ability

Table 1. Material of sprinkler pipe(Stainless steel)

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Table 2. Specification of sample

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Supported by : 산업기술평가관리원(KEIT)


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