Perpustakaan Digital ITB

Pipelines are still the main choice for transport oil and gas due to its resilience, reliability, safety, and lower cost. Most road crossing pipelines are located underground. Many protections from the loads can be used such as additional pavement and warning signs. Underground road crossing pipelines withstand stresses caused by the internal load, earth load, and live load. These loads are effected by the pipe and fluid specifications, soil and environment data, and the vehicle data. The vehicle used in this thesis will be over dimension and over loading (ODOL), as many cases of ODOL have been found in Indonesia. A manual calculation of the stress can be done by using recommended practices, in which in this undergraduate final project utilizes API RP 1102: Steel Pipelines Crossing Railroads and Highways. A stress analysis using the finite element method is also conducted using a computer software, namely Abaqus, which shows the von Mises stress and displacement of the pipeline. The use of rigid pavements as the contact of the vehicles crossing towards the stress of the pipeline is that it decreases the stress experienced by the pipeline. The results of the stress of the case study, which uses data of burial depth of 8 ft and rigid as its’ pavement type shows a value of 4,785 psi and is within the allowable range. All the other parametric studies have shown results that are still within the allowable range. The stress is found to be directly proportional to the displacement of the underground road crossing pipeline. From the parametric studies, it is shown that the total effective stress decreases as the burial depth is higher.