Texas gathering system`s scada evolved over 14 years
- Aquila Gas Pipeline Corp., Giddings, TX (United States)
The supervisory control and data acquisition (scada) system along Aquila Gas Pipeline`s more than 2,000-mile system evolved without a controlling plan over the last 14 years to become, nonetheless, workable and effective. The old system operated at about 20 bits per sec (bps), monitoring 210 points and taking a complete poll in 20 min. Although this system served the company well, in 1991 the company bought another pipeline and agreed to sell gas to a power plant. This change involved adding two new highly automated metering stations that required a more sophisticated remote terminal unit (RTU). To fulfill this need, two Fisher remote operating controllers (ROCs) were purchased. The vendor also provided three more to be tried as electronic flow meters. Meanwhile, horizontal drilling arrived in the Central Texas Austin Chalk oil field, prompting rapid expansion. Sales of natural gas increased from 60 MMcfd in 1991 to more than 300 MMcfd in 1994. The pipeline network increased from 1,200 miles in 1991 to more than 2,000 miles in 1994. Telemetering stations increased from 35 to 62, and requirements for speed and accuracy changed drastically. Two new requirements were remote operation of block valves and control valves. The paper describes the pipeline`s evolution.
- OSTI ID:
- 78437
- Journal Information:
- Oil and Gas Journal, Vol. 93, Issue 28; Other Information: PBD: 10 Jul 1995
- Country of Publication:
- United States
- Language:
- English
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