Plan optimization of the pigging and pressure testing for long-distance pipelines

Long-distance pipeline pigging and pressure testing is an important process for pipeline construction. In this process, the comprehensive property which includes the mechanical performance, manufacturing quality and construction quality of pipeline will be tested. Meanwhile, pipeline running salty on the design pressure in the operation process is inspected. The effect of long-distance pipeline pigging and pressure testing work depends on many factors, such as type selection of equipment, height difference of terrain, segment technology and construction process. Each of the factors is closely related to the safety, efficiency and success or failure of this work. In this paper, the pigging and pressure testing program in large diameter pipeline is studied during the construction process of western pipeline. Firstly, equipments are selected rationally, including air compressor, feed and booster pump, pressure test head, pig. Secondly, segment of pigging and pressure testing is simplified. Finally, measures of dealing troubles in pigging are optimized, for example, air leakage of pig and get stuck. By taking these measures, we designed the program of a section of gas transmitting from west to east project. The practice shows that construction period is shortened and equipment capacity factor is improved obviously. In short, these measures are helpful to pigging and pressure testing in long-distance pipeline for enhancing effect, saving energy and safety. © 2013 American Society of Civil Engineers.