The project will install and / or modify certain pipelines, trunk lines, transmission lines, and related facilities.For example: Off-Plot Tie-In Facilities（OPTF）and Remote Headers. The above works will be carried out between  the Hawiyah NGL plant and Haradh gas plant in the southern part of the eastern province of Saudi Arabia.The main construction tasks are as follows: the total length of the northern compressor station pipeline project is 931.69km, including 728.63 km of carbon steel pipeline, 77.3 km of RTR pipeline , 125.76 km of RTP pipeline, and station along the line, valve chamber, OPTFS reconstruction, cathodic protection and other supporting professional construction.