Currently, propane and butane produced in South Pars refineries and petrochemicals are sent to the export dock by independent 24-inch lines. There are also liquid circulation lines and return vapors with 16-inch pipes to refineries and petrochemicals, and the return production vapors are divided into two branches with 16-inch pipelines. The purpose of this project is to build a new pipeline to transfer propane and butane from the refineries of South Pars site to the export wharf with a length of about 17.5 km of 24-inch pipeline and 8.7 km of 16-inch pipeline in the vicinity of the above-mentioned lines.