IJSTR

International Journal of Scientific & Technology Research

Home About Us Scope Editorial Board Blog/Latest News Contact Us
0.2
2019CiteScore
 
10th percentile
Powered by  Scopus
Scopus coverage:
Nov 2018 to May 2020

CALL FOR PAPERS
AUTHORS
DOWNLOADS
CONTACT

IJSTR >> Volume 10 - Issue 5, May 2021 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Unsteady State Analysis In Low Head Pumping Stations

[Full Text]

 

AUTHOR(S)

Fahri Maho, Erind Maho

 

KEYWORDS

low head, penstock, pipe failure, pipeline, pumping station, rising main, transient, unsteady state, wastewater, water hammer, wave velocity.

 

ABSTRACT

Pipe failure in a rising main pipeline of a pumping station in a sensitive tourist area raised the need for a comprehensive water hammer analysis to find the causes and address protection measures. Being a low head pumping station, only a check valve has been installed to protect the system from water hammer effects. Calculations and computer modelling confirmed that immediately after an uncontrolled pump stop or power failure, the negative pressure wave starts propagating along the pipeline from the pumping station to the discharge manhole. The minimum pressure envelope intersects the rising main (pipeline), creating a vacuum on the pipeline in almost its full length. Without water hammer protection measures, the vacuum on the pipeline would be one of the main causes of the pipe failure. This study confirmed the need for water hammer analysis and consideration of protection measures even in rising mains of low head pumping stations to eliminate the consequences of such phenomenon.

 

REFERENCES

[1] L. Allievi, Teoria del colpo d'ariete. (Theory of water-hammer.) Atti del Collegio degli Ingegneri ed Architetti Italiani, Milan, Italy (in Italian). (French translation by D. Gaden, 1921, Paris: Dunod; English translation by E.E. Halmos, 1925, Rome: Riccardo Garroni, 1913.
[2] M. H. Chaudhry, Applied Hydraulic Transients, Second ed, New York: Van Nostrand Reinhold Co, 1987.
[3] J. Duc, "Negative pressure phenomena in pump pipelines," in ASME International Symposium on Water Hammer in Pumped Storage Projects, Chicago, 1965.
[4] J. Frizell, "Pressures resulting from changes of velocity of water in pipes," ASCE, vol. 39, no. 819, pp. 1-18, 1898.
[5] N. Joukowsky, "Über den hydraulischen Stoss in Wasserleitungsröhren. (On the hydraulic hammer in water supply pipes)," Memoires de l’Academie Imperiale des Sciences de St.- Petersbourg, Series 8, vol. 9, no. 5, 1900.
[6] J. Zaruba, Water hammer in pipe-line systems, 1993.
[7] A. Simpson, "Large water hammer pressure due to column separation in sloping pipes," Ph.D. Thesis, Dept. of Civil Engineering, the University of Michigan, Ann Arbor,, Michigan, 1986.
[8] E. Wylie and V. Streeter, Fluid transients, New York, NY, USA: McGraw-Hill International Book Co., 1978.
[9] E. Wylie and V. Streeter, Fluid Transients in Systems, New Jersey: Prentice-Hall, Englewood Cliffs, 1993.
[10] E. Wylie and V. Streeter, Fluid Transients (Republished with minor corrections by , Michigan, 1983), New York, (1978), McGraw-Hill.