Feasibility Study Of Long Distance Natural Gas Pipeline Project In Pearl River Delta

The long distance natural gas pipeline in the Pearl River Delta is planned to ease the tight supply situation of Pearl River Delta area,assisted with the natural gas transmission of LNG Terminal.It is planned to be constructed in two phases,including pipeline length 334.37km of phase 1 with the designed gas transmission capacityof 43.32×10~8Nm~3/a,pipeline length131.78 km of phase 2 with the designed gas capacity of 105.63×10~8Nm~3/a.The whole pipeline includes trunkline,branch trunklines and branch lines.According to the topography along the hydrogeological conditions and cultural situation,This paper is developed a plan of southern and northern pipeline route based on the necessity argument of the Pearl River Delta Natural Gas Pipeline construction.With the help of comparative analysis.The Southern line was choosed as the best route plan of Pearl River Delta long distance gas pipeline.Variable pipe diameters were used according to different transmission volume for different pipeline.By calculating the process and present value of the cost of 27 sets of pipe with different diameters,based on the present value of costs minimum principles,the optimal pipe diameters combination were determined.For meeting the requirements of pressure drop and minimizing investment,The optimal diameter of branch tunklines and branch lines,numbers of gas stations and location,also the process flow design were made for each gas station.Through the calculation of equipments selection and intensity,main gas equipments of stations and pipe specifications of pipeline were selected.Through investment assessment,economic indicators calculation,break-even analysis and sensitivity analysis for design plan,the feasibility of long distance gas pipeline in the Pearl River Delta was studied.The results showed that:the project after-tax internal rate of return 11.60%,pre-tax financial internal rate of return of 12.48%,financial internal rate of return is 10%greater than setted benchmark rate of return.It indicates that the profitability of the project meets the minimum requirements,the project is feasible in economic,but the anti-risk ability of the project is not strong.