BOTAS Natural Gas Project

BOTAS Natural Gas Project

The BOTAS Natural Gas Transmission Project has been implemented for control and monitor of a total of 120 reducing and metering station (RMS), line valves and compressor stations along 2000 km main gas pipelines from Russia and Bulgaria. This is one of the most complex, largest and ambitious natural gas SCADA project in the world.

The total amount of the contract of 5.0 million US Dollars signed by Metso Automation. SYS Inc. was responsible for complete field equipment/services and screen, database and report design and implementation for the main SCADA centers.

The project was completed in 18 months and commissioned in June, 2001.

The SCADA system consists of a total of 120 outstations, a primary SCADA center located in Ankara and two secondary SCADA centers located in Pendik and Dogubeyazit respectively. A complete SCADA building was also in the scope of the contract.

Metso Automation's Unix based OaSyS package has been used in primary and secondary SCADA centers.

For local control and monitoring of the outstations, Metso Automation's Windows NT based S/3 SCADA package and Motorola MOSCAD RTUs has been used.

The Motorola MOSCAD RTUs in the RMS stations perform total control and monitoring of the field equipment,AGA gas calculations and other process control functions. The complex functions of the MOSCAD RTUs include AGA3 (tribune metering); AGA7 and AGA8 (orifice metering) calculations for up to four meter runs, gas pressure and temperature control using PID algorithms (up to 7 loops), solenoid valve controls, station shutdown logic control and other control and monitoring functions. The MOSCAD RTUs in the RMS stations also provide intelligent connection to the existing measurement and analysis equipment such as flow computers and gas chromatographs thru SYS's state of the art PortMaster unit, which provides protocol interface and front-end processing. The RTU system at the stations also incorporate HART modems to enable intelligent field transmitters to be interfaced with the SCADA system.

Each RMS station has also a local SCADA system that allows local control and monitoring for operations personnel. The local SCADA system consists of one PC equipped with S/3 SCADA package and two printers for alarm and screen printing purposes. LCD/Keypad units are also provided in the RTU system to allow operator control under emergency conditions. All inputs/outputs wired to hazardous area are via IS barriers and fuses.

There are one primary and two secondary SCADA centers in the system. The primary SCADA center is located in Ankara, West Secondary Center is located in Istanbul (400km from Ankara) and East Secondary Center is located in Dogubeyazıt (1500km from Ankara). The SCADA centers are linked to each other using separate 2Mbps lines. The Primary SCADA center comprises dual redundant CMX RISC servers (Alpha), dual redundant XIS RISC servers (Alpha), 6 operator workstations, 4 engineering workstation, 1 projection system workstation, 1 director workstation, various printers for alarm/event and screen-printing purposes. Each secondary center incorporates 1 CMX/XIS RISC server, 1 operator and 1 engineering workstation to enable monitoring and control of the stations within the district.

The communications is via a microwave system by Bosch/Ericsson, which provides coverage over 2000 km pipeline. The outstations communicate with the SCADA Center using MDLC protocol. A set of redundant communication gateways at the SCADA center provides TCP/IP connectivity to the SCADA LAN. The system has more than 10000 I/O points.