Experimental Study of Oil Pipeline Leak Processes

Agbakwuru Ahamefula Jasper, Gudmestad Tobias Ove, Bilstad Torleiv

Department of Environmental Engineering, University of Stavanger, Stavanger, Norway.
Department of Offshore Engineering, University of Stavanger, Stavanger, Norway.

DOI: 10.4236/jep.2012.37072                

Abstract

This work provides a description of oil leak/spill processes from containment such as pipeline. Understanding of such processes is important in order to adequately estimate oil spills and to justify an appropriate emergency action for minimizing spills. Internal diameters of pipes used in the study are within 4 inches. Leaks are simulated from plastic pipeline oil containment fitted with valves. The leak response with time when upstream and downstream valves are operated is studied. Within the internal diameters of pipelines considered in the tests, two ranges of leak characteristics are evident; the “holding range” and the “flowing range” characteristics. The consequences of these characteristics in the oil industry operations have been discussed. The work suggests a spill estimation method based on this knowledge. Furthermore, in order to minimise spill in event of pipeline failure, it is observed that the optimum action on pipeline operational valves, is the immediate closure of upstream valve, followed by the downstream valve, nearly simultaneously. Future work will extend the test to larger diameter pipelines to attempt developing a mathematical approach for estimating limits of the “holding range” characteristics of pipelines given appropriate parameters and in-field test.

Keywords

Oil Spill; Oil Leak; Pipeline; Downstream Valve; Upstream Valve; Early Leak Event

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	The United State’s Department of Transportation Pipeline and Hazardous Materials Safety Administration, “Hearing on the ExxonMobil Silvertip Pipeline Failure in Yellowstone County, Montana,” 2011.
[2]	S. Nigeria, “Oil Spill Data,” 2011. http://www.shell.com.ng/home/content/nga/environment_society/respecting_the_environment/oil_spills/
[3]	U.S. Department of Transportation Standards, “United State’s Environmental Impact Statement (EIS. TransCanada’s Keystone XL Project,” 2010. http://www.keystonepipeline-xl.state.gov/clientsite/keystonexl.nsf/19_KXL_Sec_3.13_Risk%20Assessment.pdf?OpenFileResource
[4]	T. B. Benjamin, “Gravity Currents and Related Phenomena,” Journal of Fluid Mechanics, Vol. 31, No. 2, 1968, pp. 209-246. doi:10.1017/S0022112068000133
[5]	T. K. Fannelop, “Flow Processes and Leak Rates Associated with Broken Underwater Pipelines,” Norwegian Maritime Research, Vol. 5, No. 1, 1977, pp. 6-13.
[6]	C. Kranenburg, “Exchange Flow of Oil and Sea Water in a Ruptured Submarine Pipelines,” Applied Ocean Research, Vol. 6, No. 1, 1984, pp. 23-30.
[7]	J. A. Agbakwuru, “Potential Leak Detection Technologies: Assessment and Perspective in the Nigerian Delta Region,” Journal of Environmental Protection, Vol. 2, No. 8, 2011, pp. 1055-1061.
[8]	I. Jonas, “Montana Leak May Alter Exxon Safety Reviews,” 2011. http://www.reuters.com/article/2011/07/04/us-exxon-review-idUSTRE7634WS20110704
[9]	H. Rye and P. J. Brandvik, “Verification of Subsurface Oil Spill Models,” 1996. http://www.iosc.org/papers_posters/02334.pdf
[10]	M. Reed, O. Johansen, B. HOverstad, B. Hetland, S. Buffington and M. H. Emilsen, “Numerical Model for Estimation of Pipeline Oil Spill Volumes,” Environmental Modelling & Software, Vol. 21, No. 2, 2006, pp. 178-189.
[11]	O. Johansen, “Development and Verification of Deep-Water Blowout Models,” Marine Pollution Bulletin, Vol. 47, No. 9-12, 2003, pp. 360-368. doi:10.1016/S0025-326X(03)00202-9
[12]	C. Koh Robert and F. Loh-Nien, “Mathematical Models in the Prediction of Temperature Distribution Resulting from the Discharge of Heated Water into Large Bodies of Water,” EPA Report, 1970.
[13]	T. K. Fannelop, “Hydrodynamics of Underwater Blowouts,” Norwegian Maritime Research, Vol. 4, 1980, pp. 7-33.
[14]	T. K. Fannelop, “Fluid Mechanics for Industrial Safety and Environmental Protection,” Industrial Safety Series, Vol. 3, 1994, pp. 59-98.