Abstarct: Since 30 years ago, industrialized Countries using from pinch analyze to designation and retrofitting theire site plans of companies and factories that had high levels of Energy consumption, like fuel and heat. Of course that pinch analyze was used in many of third world, but it was'nt a great position that it must be. With using this modern technology we can decrease the energy consumption and hot and cold utilities in high level. In this case study, we could decrease the heating and electrical energy with using the pinch technology and heat recovery. And as decrease a mounts of emission costs. In this feasibility study, at first, NGL400 site plan was simulated with Aspen Plus 7.1 and then extract the data with Aspen Energy Analyzer 7.1 from Aspen Plus. With study the result from these datas , estimated that thare is a large a mounts of heatlosses in process and hot smoke that exit from the exhaust of gas turbin, without using its heat. For heat recovery from this gas, we must use much as possible processing heat transferring instead of fuel consumption and hot and cold utilities. We study this topic with editing the heat exchanger network. Finaly, for assay the ecionomical of this project , with calculating amounts of energy and cost saving and the prices of heat exchangers, estimate the pay back period and determined that are these offers effective or not!