Gas transmission systems

In 1985, the first active magnetic bearing in a pipeline compressor for continuous use was installed on the Alberta Gas Transmission System of NOVA Corporation. Tlie bearings have been running smoothly, with a noted improvement in compressor operation and efficiency. 

San Diego Gas Electric s system was originally installed as a research project. The intent of the research project was to test the hardware in this application, test the feasibility of operating such a system remotely with no local operators, and to prove the economics. Similar systems had been installed within process plants where operators were present to start and stop the system and monitor its operation. However, this was the first system installed on a natural gas transmission system with completely remote operation. 

Figure 8-12. San Diego Gas Electric Company s gas transmission system.

Wm. Haynes There may also be problems with carbonyl formation if you try to handle medium Btu gas in the present high pressure gas transmission system. 

Initial gas transmission system and final optimal system using the costs of line A, Figure E13.4b. 

The hydrocarbon dew point is reduced to such a level that retrograde condensation (i.e., condensation resulting from pressure drop) cannot occur under the worst conditions likely to be experienced in the gas transmission system. Similarly, the water dew point is reduced to a level sufficient to preclude formation of Cl to C4 hydrates in the system. 

Figure 1 The Snam Rete Gas transmission system consisting of 11 compression plants, 29,600 km of natural gas pipelines with diameters from 25 to 1,200 mm operating at pressures between 0.5 and 75 bar.

Christensen Team Leader and Senior Energy Consultant at RAMBOLL Consulting (Denmark). Papava Petroleum Geologist. Sidamonidze Reservoir Engineer EU TACIS Project on Rehabilitation of Gas Transmission System in Georgia, June 2002-June 2003... 

Underground Gas Storage in Georgia Figure 3-1 Georgia s gas transmission system... 

During the EC TACIS project RAMBOLL has sought to clarify whether the current tariff regulation practise actually discourages the undertaking of investments aiming at improving the reliability of the gas transmission system. 

Natural gas transmission systems operate most efficiently and at lower cost when run continuously at maximum capacity. Therefore, at periods of low demand, gas is pumped to storage reservoirs, preferably located in the consuming regions. 

NOVA, AN ALBERTA CORPORATION owns and operates a natural gas transmission system in the Province of Alberta and handles more than 75 percent of the Canadian gas sold in North America. As of December 31, 1985, NOVA s Alberta Gas Transmission Division recorded receipts of 2.25 trilhon cubic feet with an average of 6.2 billion cubic feet being moved per day. NOVA s system consists of 756 receipt and major delivery metering points connected by 8,559 miles of pipeline. 

Zhang, C.Y 2008. RBI Quantitative Risk Assessment of Gas Transmission System. Lanzhou Lanzhou Institute of Petrochemical Technology Pubhshing House. 

Calculated as total hits (104,128) miles of gas line (1,778,600) = 0.0585 hits per mile or 58.5 hits per 1,000 miles. (104,128 hits, 2 861 767.4 kilometers = 0.0364 hits per kilometer or 36.4 hits per 1000 kilometers.) Note Different categories of gas lines were added together. Transmission lines have a substantially lower rate than other gas systems survey respondents reported 201 hits per 36,042 line miles (57 992 kilometers), for a rate of 5.5 hits per 1,000 miles (1609 kilometers). However, GRI survey numbers account for only 10 percent of the U.S. gas transmission system. If the number of transmission system hits per 1,000 miles is separated from the U.S. total, the rate for local distribution companies increases to 71 hits per 1,000 miles. 

Gas transmission systems beneath surface impoundment iiners... 

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