A study is made on the pressure surges on a fluid system with air valves. The effects of the presence and distribution of air on the system response are studied. Several distinct pressure transient characteristics were observed through this investigation. Investigations showed that air valves with high inflow characteristics installed at peak locations of a fluid system with entrapped air may reduce the magnitude of the extreme negative pressure surges. However, for near zero air entrainment levels, air valves with higher outflow characteristics tend to result in higher positive pressure surges. The effectiveness of the air valves installed for the purpose of surge protection depends not only on the physical configuration of the fluid system, the physical properties of the pipeline and the fluid, but significantly also on the characteristics of the air valves and the distribution of air in the system. The results of the investigations in the present work were confirmed through field observations and measurements.

Issue Section:
Research Papers
Topics:
Fluids, Hydraulic transients, Valves, Pressure, Surges, Air entrainment, Inflow, Outflow, Pipelines, Transients (Dynamics)
1.
Campbell, A., 1983, “The Effect of Air Valves on Surge in Pipelines,” Proc. 4th Int. Conf. on Pressure Surges, BHRA, Bath, United Kingdom, Paper C1, pp. 89-102.
2.
Devine
J. G.
, and
Creasey
J. D.
,
1997
, “
Surge Suppression: Case at all Stages
,”
Journal of the Chartered Institution of Water and Environmental Management
, Vol.
11
, No.
5
, pp.
341
–
345
, Oct.
3.
Fox, J. A., 1984, Hydraulic Analysis of Unsteady Flow in Pipe Networks, Macmillan, London.
4.
Kranenburg
C.
,
1974
, “
Gas Release During Transient Cavitation in Pipes
,”
J. Hydraulic, Div.
, ASCE, Vol.
100
, pp.
1383
–
1398
.
5.
Lee, T. S., and Cheong, H. F., 1994, “Teck Hock Pumping Station: Flow Rate and Pressure Transient Measurements,” Johnson Pacific Pte Ltd, Singapore. Dec.
6.
Lee, T. S., and Cheong, H. F., 1998, “Tanjong Rhu Pumping Station—Site Measurement and Analysis of Surge in Pumping Main,” Ebara Engineering Singapore Pte Ltd, Singapore, July.
7.
Lee
T. S.
, and
Pejovic
S.
,
1996
, “
Air Influence on Similarity of Hydraulic Transients and Vibrations
,”
ASME JOURNAL OF FLUIDS ENGINEERING
, Vol.
118
, Dec., pp.
706
–
709
.
8.
Pearsall
I. S.
,
1965
,
/66
, “
The velocity of water hammer waves
,”
Proc. Inst. Mech. Eng.
, Vol.
180
, Part
3E
, pp.
12
–
20
.
9.
Pejovic, S., and Lee, T. S., 1996, “Similarity of Transient and Oscillatory Flow of Real Fluid,” Mechanics, Materials and Constructions (Scientific Meetings of the Serbian Academy of Sciences and Arts, Vol. LXXXIII, Department of Technical Sciences, Book 2, pp. 247–258.
10.
Provoost, G. A., 1976, “Investigation into Cavitation in a Prototype Pipeline Caused by Waterhammer,” Proc, 2nd. Int. Conf. on Pressure Surges, BHRA, Bedford, United Kingdom, Sept., pp. 35–43.
11.
Stephenson
D.
,
1997
, “
Effects of Air Valves and Pipework on Water Hammer Pressures
,”
ASCE, Journal of Transportation Engineering
, Vol.
123
, No.
2
, pp.
101
–
106
, Mar.-Apr.
12.
Thorley
A. R. D.
,
1989
, “
Check Valve Behaviour Under Transient Flow Conditions: A State-of-the-Art Review
,”
ASME JOURNAL OF FLUIDS ENGINEERING
, June, Vol.
111
, pp.
178
–
183
.
13.
Tullis, J. P., 1971, “Control of Flow in Closed Conduits,” Fort Collins, CO, pp. 315–340.
14.
Wylie, E. B., Streeter, V. L., and Suo, L., 1993, Fluid Transients in Systems, McGraw-Hill.
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