Unlike general transmission pipelines the emphasis lies on the distribution of the captured lean gas in a restricted area rather than transmission over a long distance.
The production of oil is often accompanied by a vast amount of associated gas which represents a substantial part of the energy content of the field and which is often simply flared due to the lack of a pipeline system to distribute it to customers in the vincinity of the field. Using the example of an on-shore field in the Emirate of Sharjah, UAE, this paper demonstrates how at least part of the associated gas which originally was flared has been collected, compressed and distributed to power stations and industrial consumers to substitute distillate fuel. It also describes how the project was implemented from the initial project was implemented from the initial feasibility study to initial commercial operation.
The second part of the paper deals with long distance pipelines such as those which carry natural gas from western Siberia to Europe. One of the main aims in the optimization of these lines is the improvement of transportation efficiency. This means the reduction of fuel gas requirements and increasing the overall efficiency of the compressor stations.
The development in this field has led to large diameter pipelines and high operating pressures which in turn make it compulsory pressures which in turn make it compulsory to use high grade steels like X 70 or even X 80 for the pipes. The improvement in machinery and related station equipment has reduced fuel gas losses from the former figure 13 % to approximately 10 %. Further reductions to below 10 % are probable if all the-modern possibilities of waste heat recovery and computer aided load management are applied.