Setting-up of external pressure test facilities for marine riser

• Main Author: Low, Ivor Jia Lu
• Other Authors: Ong Lin Seng
• Format: Final Year Project
• Language: English
• Published: 2014
• Subjects: DRNTU::Engineering::Mechanical engineering
• Online Access: http://hdl.handle.net/10356/60294
• Institution: Nanyang Technological University

As the population increases, the rapid needs for evermore energy are in demand. This lead to issues with the challenges faced of extracting oil and gases on challenging offshore terrains and especially into deep seas with a current depth of 10,411 feet (3,174meters) in India. With the essential need to explore into deeper depths for more resources and to transfer the product through pipe onto surface to enable sustainability, a literature review on marine risers is discussed in details. It covers on the types of marine riser current in the market, the materials used, comparison between metallic and composite marine riser and the types of failure occurred in marine riser. This would aid in the initial designing of the experiments required for this report. Different materials are explored like composite which offers many benefits and also challenges of its complexity material properties to incorporate into the design of riser. Hence, the objective of this report is to setup a small scale external pressure test facility to conducts a collapse test on marine riser. The test facility is able to facilitate different materials in a safe manner without endangering the safety of staffs and students in the Laboratory. The pipe sealing mechanism is an important apparatus for this experiment. The component such as connecting rod holds the test specimen inside the testing chamber. Solidworks software is used to model the connecting rod and simulation is used to ensure that it does not failed before the actual test specimen fails. A strain and displacement analysis results of the connecting rod are generated and prove that it would not fail during the actual test. The expected maximum stress occurring at the connecting rod is 43.2MPa which is much lower than the external pressure. Prior to actual collapse test, simulation of collapse test is part of the setup of test facility. The uses of Finite Element Analysis software ABAQUS are introduced to simulate the test specimen in the testing chamber at the stipulated external pressure of 68.94MPa. The procedures of modeling composite test specimen via ABAQUS are presented in this report. Simulation assumptions made and results are discussed accordingly. A graph of ovalization against pressure are plotted to show that critical collapse pressure can be determine by the perfection shape of test specimen. In the last part of the report, the simulation result of connecting rod and detail calculation to determine the ovalization of test specimen will be reviewed. With the essential need to explore into deeper depths for more resources and to transfer the product through pipe onto surface to enable sustainability, a literature review on marine risers is discussed in details. It covers on the types of marine riser current in the market, the materials used, comparison between metallic and composite marine riser and the types of failure occurred in marine riser. This would aid in the initial designing of the experiments required for this report. Different materials are explored like composite which offers many benefits and also challenges of its complexity material properties to incorporate into the design of riser. Hence, the objective of this report is to setup a small scale external pressure test facility to conducts a collapse test on marine riser. The test facility is able to facilitate different materials in a safe manner without endangering the safety of staffs and students in the Laboratory. The pipe sealing mechanism is an important apparatus for this experiment. The component such as connecting rod holds the test specimen inside the testing chamber. Solidworks software is used to model the connecting rod and simulation is used to ensure that it does not failed before the actual test specimen fails. A strain and displacement analysis results of the connecting rod are generated and prove that it would not fail during the actual test. The expected maximum stress occurring at the connecting rod is 43.2MPa which is much lower than the external pressure. Prior to actual collapse test, simulation of collapse test is part of the setup of test facility. The uses of Finite Element Analysis software ABAQUS are introduced to simulate the test specimen in the testing chamber at the stipulated external pressure of 68.94MPa. The procedures of modeling composite test specimen via ABAQUS are presented in this report. Simulation assumptions made and results are discussed accordingly. A graph of ovalization against pressure are plotted to show that critical collapse pressure can be determine by the perfection shape of test specimen. In the last part of the report, the simulation result of connecting rod and detail calculation to determine the ovalization of test specimen will be reviewed.