ABSTRACT

This paper focus on analyzing a pipeline rupture effects, and compare the simulation results to the SCADA data. This comparison clarifies the Pipeline Operator with some questions: has the shutdown valves protection device actuated? Did pressure drop in the pipeline match with the simulation model? After the emergency treatment, another issue that comes upon is the planning of the pipeline repair and the marketing remaining day's load. Once again, hydraulic simulation brings the Pipeline Operator to the optimum solution.

INTRODUCTION

One of the most significant issues for pipeline hydraulic models is to match the model results to the operating data. In an existing pipeline network this "tuning" is carried out by comparing the measured variables and those obtained by making calculations under different operating conditions. On November 2008, a pipeline rupture took place at the southern section of BolÍvia-Brazil Gas Pipeline (GASBOL). Rupture data were measured from SCADA system in some city-gates and compressor stations. The objective of this paper is to compare these measured data with result obtained from a simulation analysis.

GAS NETWORK DESCRIPTION

The Bolivia-Brazil Gas Pipeline (GASBOL) is a 32" gas pipeline, with a total extension of 1,963 mi (3,159 km) and a rated operating pressure of 1,422 psig (100 kg/cm2g), extending from the gas producing fields of Rio Grande, Bolivia, to Canoas, Brazil. The Bolivia-Brazil Gas Pipeline Brazilian portion is owned and operated by Transportadora Brasileira Gasoduto BolÍvia-Brasil S.A., TBG, a company whose shareholders are Petrobras Gas S/A GASPETRO, BBPP Holdings Ltda, TRansredes do Brasil Holding Ltda, AEI America do Sul Holding Ltda, Bear Gás Participações Ltda. Nowadays 1060 MMSCFD (30,00 MMm3/d) in average are being transported by TBG, this amount represents 50% of the Brazilian market consumption. From its Head Office in Rio de Janeiro, TBG controls all the Pipeline's operations along its entire length of 1,611 mi (2,593 km) on Brazilian soil. It surveys the full extension of the Pipeline 24 hours a day, by satellite, utilizing a SCADA system. The maintenance of the Pipeline's installations is a responsibility of the three Operational Divisions: West, located in Campo Grande, covering the State of Mato Grosso do Sul; East, located in Campinas, servicing all the State of São Paulo; and South, located in Florianópolis, in charge of the States of Paraná, Santa Catarina and Rio Grande do Sul.

Event Description Overview

The 2008 Santa Catarina-Brazil floods occurred after a period of heavy rainfall during November 2008, most significantly during days 20, 21, 22 and 23 of November. The state suffered constant rainfalls for over two months (during September, October, and November) on the coast, which turned the soil wet enough to cause a landslide during the storm that hit the state in late November. It affected around 60 towns and over 1.5 million people in the state of Santa Catarina in Brazil. At least 128 people are confirmed to have been killed with over 78,700 being forced to evacuate their homes.

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