Analysis on effect of ball bladder size during water hammer in domestic water system

Faarih Farhan Mohd Nasir, Mohd Shahir Kasim, Raja Izamshah, Mohammad Shah All Hafiz, Jaharah A. Ghani, Ahmad Anas Yusof, Pui Kei Wong, W. Noor Fatihah Mohamad

Research output: Contribution to journalArticle

Abstract

Water hammer is a common phenomenon when a home pipe suddenly shuts down. The phenomenon may lead to pump failure, water system fatigue, pipe rupture and contaminated water backflow, and thus produces a loud banging or hammering noise. To prevent this phenomenon, a suitable accumulator is a must. Therefore, the objective of this research is to identify the exact volume of the bladder needed in the accumulator to overcome water hammer in the domestic water system. A ball bladder type of accumulator was chosen due to its flexibility, lightweight and capability to absorb hydraulic shock during the water hammer. The diameter of the ball bladder was 75 mm. There were two parameters for the experiment, namely water pressure during water hammer and the effect of ball bladder size on the hydraulic shock. These parameters were analysed to reduce the effect of water hammer in the future. The experiments were conducted by using DAQami software to understand the behaviour of the shock wave due to water hammer in the presence of a ball bladder. The outcome of analysis showed that the accumulator with four ball bladders with size of 883.57 cm3 (2.79 bar), had the slowest time in terms of water pressure increase when the test valve was shut down suddenly. In addition, there was no leakage at the pipe, no water droplets and no noisy sound from the pump when the test valve is shut down immediately or suddenly. Besides, the pressure of the shock wave was reduced from 4.00 bar to 2.79 bar, leading to a reduction of 1.21 bar (30%). This research revealed that the appropriate size of ball bladder for the domestic water system to prevent water hammer was 1523.33 cm3, which was approximated to seven ball bladders.

Original languageEnglish
Pages (from-to)33-43
Number of pages11
JournalJournal of Advanced Research in Fluid Mechanics and Thermal Sciences
Volume61
Issue number1
Publication statusPublished - 1 Jan 2019

Fingerprint

Water hammer
Water
Pipe
Shock waves
Hydraulics
Pumps
Leakage (fluid)
Experiments
Acoustic waves
Fatigue of materials

Keywords

  • Ball bladder accumulator
  • Domestic water system
  • Shock wave
  • Water hammer

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

Cite this

Nasir, F. F. M., Kasim, M. S., Izamshah, R., Hafiz, M. S. A., Ghani, J. A., Yusof, A. A., ... Mohamad, W. N. F. (2019). Analysis on effect of ball bladder size during water hammer in domestic water system. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 61(1), 33-43.

Analysis on effect of ball bladder size during water hammer in domestic water system. / Nasir, Faarih Farhan Mohd; Kasim, Mohd Shahir; Izamshah, Raja; Hafiz, Mohammad Shah All; Ghani, Jaharah A.; Yusof, Ahmad Anas; Wong, Pui Kei; Mohamad, W. Noor Fatihah.

In: Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, Vol. 61, No. 1, 01.01.2019, p. 33-43.

Research output: Contribution to journalArticle

Nasir, FFM, Kasim, MS, Izamshah, R, Hafiz, MSA, Ghani, JA, Yusof, AA, Wong, PK & Mohamad, WNF 2019, 'Analysis on effect of ball bladder size during water hammer in domestic water system', Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, vol. 61, no. 1, pp. 33-43.
Nasir, Faarih Farhan Mohd ; Kasim, Mohd Shahir ; Izamshah, Raja ; Hafiz, Mohammad Shah All ; Ghani, Jaharah A. ; Yusof, Ahmad Anas ; Wong, Pui Kei ; Mohamad, W. Noor Fatihah. / Analysis on effect of ball bladder size during water hammer in domestic water system. In: Journal of Advanced Research in Fluid Mechanics and Thermal Sciences. 2019 ; Vol. 61, No. 1. pp. 33-43.
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