| Author | Somkiat Katanyoowongcharoen |
| Call Number | AIT Thesis no.OTM-13-10 |
| Subject(s) | Underwater pipelines--Design and construction--Simulation methods
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| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering in Offshore Technology and Management, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. OTM-13-10 |
| Abstract | Subsea pipeline operating under High Pressure High Temperature (HPHT) condition is increasingly required for operation in the oil & gas industry. At high temperature and pressure, significant compressive forces can develop in the pipeline due to restricted thermal expansion. Consequently, the pipeline is tentatively to release the compressive forces by adapting into a secondary equilibrium configuration, i.e. lateral buckling. Numerous factors such as soil friction, soil-pipe relationship model, pipe weight and the initial out of straightness of pipe contribute to lateral buckling condition. This study presents a case study on a example project. The project involves a 12-inch gas pipeline on seabed consisting of sandy soil. The temperature and pressure in this study are 100 oC and 68.95 barg (1000 psig) respectively. The simulation is executed by ABAQUS program. Three parameters including (i) axial coefficient of friction (ii) lateral coefficient of friction (iii) soil-pipe interaction model were studied. The appropriate simulation model will be concluded by considering on stress, axial force, lateral force, axial displacement and lateral displacement. Operational envelope for this project is also presented in this study. The simulation results show that the base case with upper bound of axial friction coefficient, upper bound of lateral friction coefficient and Coulomb soil-pipe relationship is a conservative model for stress, axial force and lateral force. While the base case with lower bound of axial friction coefficient, upper bound of lateral friction coefficient and Coulomb soil-pipe relationship provides maximum axial displacement, the base case with lower bound of axial friction coefficient, lower bound of lateral friction coefficient and Coulomb soil-pipe relationship gives maximum lateral displacement. The base case with upper bound of axial friction coefficient, upper bound of lateral friction coefficient and SAFEBUCK soil-pipe relationship is a conservative model for operating condition at 68.95 barg with 89.800C operating temperature. |
| Year | 2013 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. OTM-13-10 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Offshore Technology and Management (OTM) |
| Chairperson(s) | Chiu, Gregory L. F.;Pornpong Asavadorndeja; |
| Examination Committee(s) | Thongchai Phanyasahachart; |
| Scholarship Donor(s) | Royal Thai Government Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2013 |