Introduction

The project being described in this paper is one of the first of its' kind in the world and is made necessary for the future operations of the pipeline based on continuing deregulation. The effects of deregulation in countries around the world are driving pipeline companies on a global basis to re-think the way they operate and do business. The emphasis of this project is on the integration of the business and operational worlds to come into a more realistic perspective of how the physical world can impact the commercial world. The implementation of pipeline modeling systems and business systems is a part of a project to provide a comprehensive real time pipeline monitoring, leak detection, and Nomination, Allocation and Billing System for the SembGas Gas receiving and distribution pipeline system in Singapore. The system that has been provided on this project is based on Energy Solution's, gas on-line modeling and leak detection system called LICLDS and the Nomination, Allocation and Billing System called NABS. Both LICLDS and NABS are implemented on a single PC server based on an Intel processor running Microsoft Windows NT 4.0. LICLDS is an enhancement to the functions provided by the SCADA system. LICLDS includes graphical user interface, which provides access to all major modeling functions. SCADA makes field data available to the operator at designated consoles. The LICLDS system provides additional information about real time and/or future pipeline conditions, thereby enabling safe and efficient operation of the pipeline. Certain data at various measurement locations along the pipeline is passed from the SCADA system to the LICLDS model via the use of an OPC server/client interface. The real time model uses this data to generate detailed information on the pressures, flows and other values along the pipeline system. The application software detects and alarms for leaks and uncommon operating conditions. The Predictive Model provides a projection of current pipeline operation to forewarn the operator of possible minimum pressure violations. Results from the different modules can be viewed through the Graphical User Interface (GUI) including certain trends and graphical profiles of selected pipeline values. NABS is a system for managing the business transactions between the Gas Supplier and End Users connected to the pipeline system. The End Users will submit nomination requests via a NABS client installed at each End User site to the NABS host system. The NABS host system consolidates these requests and submits nomination requests to the Gas Supplier. NABS passes the nomination forecast to the LICLDS Predictive Model for further analysis as described above. The Buyer's Facility begins at the seller's delivery point. Once in the buyer's facility the gas passes through three sections:

  • Filters

  • Heaters, and

  • Metering section.

The gas is normally delivered dry and free of liquids and particulates at 210C. and between 550 and 600psig (37.93 - 41.38 Barg). Once in the facility the gas splits into two 24" trains that pass through a filter or heater or flow meter.

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