الفهرس 
PIPELINE (RISER/SPOOL) DESIGN OVERVIEWOnly 14 pages are availabe for public view
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Abstract
The objective of this thesis is to study the static, dynamic and fatigue
response of the offshore pipelines (Riser/Spool) under the effect of the
environmental wave force in the static analysis and the slug forces in the
dynamic and fatigue analysis. A parametric study has been performed for
three models with different pipe sizes. Each model has been studied with
different parameters in two load cases for each model with the same pipe
size. The static analysis has been performed under the effects of selfweight,
buoyancy, design pressure, design temperature, environmental
loading, pipeline thermal expansion and the jacket displacements due to
environmental loads. The hydrodynamic forces calculations for the
pipelines have been described in details in additional to the wave
theories. The dynamic analysis has been studied for all the load cases;
however the concentration is on the slug effect at the riser and spool, so it
has been studied deeply in this thesis, as it is the most critical portion of
the pipeline. It is found that the slugging inside the riser induces a large
deflection, which is much more than the displacement results from the
static analysis, also the stress induced by the slug should be studied in the
fatigue analysis.
The fatigue analysis has been studied in different models with different
slug parameters to get the dynamic response and how it affects the
pipeline design life. The fatigue design life has been deduced based on
~h~ fatigue analysis and compared with different pipelin~s design Ij~e ~o
show the importance of performing the dynamic and fatIg~e ~alysIs. in
additional to the static analysis which cannot control the pipeline design
life.At the present practices, the slugging effect is not included in the fatigue
analysis and when it is performed there are question marks about how
representative the analysis is. As this area is important and require
attention from the industry, so the slug effect, dynamic analysis and
fatigue analysis have been studied in this thesis to reply on these
questions and also the industry in this thesis is kindly requested to pay
more attention to this point in future.
The results are discussed and the main conclusions and recommendations
of the thesis are presented in the last chapter.