Selection of Line Pipes for Long Distance Pipeline

Selection of line pipes for long distance pipeline depends on the pipes' characteristics, operational conditions and service environments. The application of line pipes in some long distance pipelines form 508 to 813 mm in diameter is analyzed, and the selection principles of line pipes are given below: ① For pipeline with diameter less than 508 mm: when the operating pressure is not more than 6.4 MPa, longitudinally-welded pipe (ERW) is proper; when the operating pressure is more than 6.4 MPa, seamless pipe is proper. ② For pipeline with diameters form 508 to 813 mm or more than 813 mm: when the operating pressure is less than 6.4 MPa, spiral-welded pipe is proper; when the operating pressure is not less than 6.4 MPa, longitudinally-welded pipe (UOE) and spiral-welded pipe with subsequent heat treatment are the best candidates. The applications of line pipes in long distance pipeines at home and abroad are analyzed with some cases.