University of Isfahan Gas Processing Journal 2322-3251 3 2 2015 10 01 Improvement of Overall Efficiency in the Gas Transmission Networks: Employing Energy Recovery Systems 1 24 20403 10.22108/gpj.2015.20403 EN Sahar Safarian Department of Chemical Engineering, Reservoir Engineering, Bahonar University, Kerman, Iran Maryam Mousavi Department of Chemical Engineering, Reservoir Engineering, Bahonar University, Kerman, Iran Journal Article 2016 10 04 This study mainly focuses on enhancing the overall efficiency of gas transmission networks. The authors developed a model with detailed characteristics of compressor and pressure reduction stations. Following this, they suggested three different systems with gas turbine including: organic rankine cycle (ORC), air bottoming cycle (ABC), and ABC along with steam injection (SI-ABC). In addition, use of turbo-expander as a good alternative to the expansion valves was also studied. Performance of proposed cycles was investigated on a real case study for natural gas transmission network. Results showed that the highest efficiency would be obtained with ORC system where n-pentane was used as the working fluid and turbo-expander was considered in pressure reduction stations Moreover, the efficiency improvement was estimated to be 22% averagely in comparison with the existing network where the flow was in the span of 50 up to 90 MMSCMD. https://gpj.ui.ac.ir/article_20403_535599aa2145b3a40c13b33a349b6ec3.pdf