ANALYSIS OF THE INFLUENCE OF THE URBAN DRAINAGE SYSTEM IN THE AREA - - PowerPoint PPT Presentation

ANALYSIS OF THE INFLUENCE OF THE URBAN DRAINAGE SYSTEM IN THE AREA OF THE POOL FORMED AFTER LEAKAGE OF OIL PIPELINES

Edmilson Pinto da Silva Marcelo Bernardes Secron

INTRODUCTION

 The dimensions of the pool depend on the portion of the volume that remains on the surface  The magnitude of the consequences are directly associated with the spreading and deposition of the oil on the surface  An alternative modeling of the performance of the drainage system in the determination of the volume of hydrocarbon leaked complementing the Risk Assessment Standards (e.g. CETESB, BEVB) which do not consider the action of the urban drainage system

METHODOLOGY

METHODOLOGY

Calculation of the total volume that could be leaked (V1)  Volume leaked during pumping until detection and shutdown pumps plus the volume associated with the profile of the pipeline (gravitational volume)  For the quantification of the volume leaked during the pumping we consider the use of thermohydraulic simulators to calculate the leakage rate (Cardoso et. al, 2016)  The time to stop the pump is estimated by the pipeline operators taking into account the calculated leak rate.  For the quantification gravitational volume, it is suggested to use the methodology described by Pires et al (2005)

METHODOLOGY

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Calculation of the volume of oil that flow into the catch basins (V2)  Identification of nearby catch basin within the initial pool by visits to the place or, alternatively, by aerial images (ex. Google Earth).  Calculation

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the flow through the catch basins (depends

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the the type of catch basin). It should also take into account the reduction of their capacity due to possible obstructions (Miguez et al, 2016; Canholi, 2015)

METHODOLOGY

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Arrangement of streets

Release point

METHODOLOGY

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Arrangement of streets

Release point Initial area

METHODOLOGY

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Arrangement of streets

Release point Catch basins

METHODOLOGY

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Arrangement of streets

Release point Final area

CONCLUSION

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Calculation of the volume of oil that flow into the catch basins  The methodology proposed takes into account the urban the drainage system in the determination of the pool that would be formed after leaks in oil pipelines  The methodology has applied in preliminary to hypothetical case studies and the results

• btained have demonstrated that the drainage system is capable of significantly reducing the

amount of liquid hydrocarbons that effectively contribute to the pool

REFERENCES

 CANHOLI, A. P. 2015. Drenagem Urbana e Controle de Enchentes. 2nd ed.  CARDOSO, A. S., SILVA, E. P ., SILVA, F . L. S., CORREIA, L. C. D.

• 2015. “Using Hydraulic Simulators to Determine the Flow Rate of a

Leak to Be Used in Oil Pipeline Risk Assessment.” In Proceedings of the Rio Pipeline Conference and Exposition.  COMPANHIA AMBIENTAL DO ESTADO DE SÃO PAULO. 2014. Norma Técnica P4.261 -  Risco de Acidente de Origem Tecnológica – Método Para Decisão e Termos de Referência 2ª ed. http://www.cetesb.sp.gov.br/wp- content/uploads/sites/11/2013/11/P4261-revisada.pdf.

REFERENCES

 MIGUEZ, M. G.; VERÓL, A. P .; REZENDE, O. M. 2016. Drenagem

• Urbana. Do Projeto Tradicional à Sustentabilidade. Edited by Elsevier.

2nd ed.  PIRES, L. F . G., BARRETO, C. V., SILVA, B. G. 2005. “Determinação de Volumes Em Operação de Drenagem de Dutos.” In Proceedings of the Rio Pipeline Conference and Exposition.  RIVM. 2015. “Handleiding Risicoberekeningen Bevi,” no. december.  WILLIAMS ENERGY SERVICES. 1999. “Longhorn Pipeline System - Overall Pipeline Risk Assessment. Procedures for Calculating Drainage from Pipeline. Appendix 6D. EPA Documents.”

Thank you! Marcelo Secron – msecron@petrobras.com.br Edmilson Silva – edmilson.silva@petrobras.com.br