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Offering a Simple Method to Determine Safe Distance between Gas Pipelines and Vicinal Areas

Bagheri, Mojtaba | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42340 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Rashtchian, Davood
  7. Abstract:
  8. Sour Gas is more dangerous than sweet gas because of its hydrogen sulfide contents. So it requires more safety considerations. In this project, the effect of wall thickness and design factor of pipeline on the safe distance was examined by using risk assessment method. The safe distance tables for 4 pipelines with different wall thicknesses and design factors were prepared based on operating pressure, pipe diameter and hydrogen sulfide concentration in gas by using PHAST and PHAST RISK softwares. In this project, the depth of cover parameter was considered in safe distance determination. Also the leak of sour gas was simulated by using computational fluid dynamics and FLUENT software in 3 cases: with 45 degree angle to the horizon, horizontal leak and horizontal impingement leak. 3 sizes for pipeline's hole were selected in all cases. Obtained results from PHAST and FLUENT software for formation of hydrogen sulfide gas cloud were compared. It was found that the results in case with 45 degree angle to the horizon are Compatible together, but in other cases the difference in results is more apparent. This comparison showed that results are in more compatibility as the freedom of Gas jet increases and the results will be more different as the freedom of Gas jet decreases. According to the past researches and experimental comparisons, it can be said that the CFD results are more precise
  9. Keywords:
  10. Sour Gas ; Pipelines ; Risk Assessment ; Computational Fluid Dynamics (CFD) ; Safety Distance

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