The Response of Pipelines in High Pressure, High Temperature Offshore Environment.
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Date
2012
Authors
Adelaja, A.O
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Abstract
This thesis explores the application of Euler-Bernoulli beam theory to derive the equations
of motion of fluid conveying pipelines subjected to high pressure, high temperature
offshore conditions. The vibration responses show that the higher the density of the
transported fluid, the lower the critical velocity at which resonance will take place, hence
heavier fluid should be pumped at lower velocity than lighter ones whereas heavier
surrounding fluid (as in the case of salty and muddy swamp) behaves as a damper. In
addition, the higher the inlet temperature, the higher the period of oscillation but the lower
the critical velocity required to initiate resonance. The study also provides theoretical bases
for the popular practice of burying of pipeline as a means of controlling buckling and
further justifies the same means for the control of pipe walking where the geology permits
it. Deformations such as pipeline buckling and pipe walking are found to be enhanced by increase in inlet temperature which is a function of the well condition. Furthermore, the
study is shows that the hitherto central role attributed to transient response may not be the
main driver for pipe walking since the magnitude of steady state is higher and may after all
be responsible. Also, the results of the order of the contributing factors indicate that
oscillatory strain, pressure, temperature, tension and friction among others play a
significant role in the phenomenon of walking.
Description
A Thesis Submitted to the School of Postgraduate Studies, University of Lagos.
Keywords
Offshore Environment. , Fluid , Pipelines in High Pressure , Research Subject Categories::TECHNOLOGY::Engineering mechanics::Fluid mechanics
Citation
Adelaja, A.O (2012), The Response of Pipelines in High Pressure, High Temperature Offshore Environment. A Thesis Submitted to University of Lagos School of Postgraduate Studies Phd Thesis and Dissertation, 230pp.