الفهرس 
CHAPTER (1): INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Pressure vessels are rated as one of the most significant static equipment used in several fields such as processing plants, space applications, nuclear power plants, and unmanned subsea vehicles in marine applications. Pressure vessels may be employed for pressurized fluids storage, transportation, and processing. Three-phase separators are
utilized as a part of inlet facilities for gas dehydration process plants. Wellhead stream contains mixed liquid and gaseous components that should be segregated as a part of initial processing for natural gas. Gravity separators are simply pressure vessels used for mixed phase well stream separation into gas and liquids.
The present work proposes an alternative multi-layered composite filament-wound pressure vessel for a three-phase separator belongs to Abu Dhabi Company for onshore oil operations (ADCO) that was sized using process simulation, based on the mixed
phase feed analysis data. Different composite material lay-ups and fiber orientations are considered. The PVs are made up of S-glass/Epoxy, Carbon/Epoxy (IM6/SC1081), and
hybrid of both laminates, with [±𝜃]𝑛𝑠, [0, ±𝜃]𝑛𝑠, [90, ±𝜃]𝑛𝑠, [0, ±𝜃, 90]𝑛𝑠, and [90, ±𝜃, 90]𝑛𝑠 lay-ups.
Mathematical solution based on classical lamination theory (CLT) is derived from cited work to determine the minimum allowable structural wall thickness for PV based on safety factor when subjected to pure pressure load case. Moreover, it was developed to evaluate the change in safety factor when subjected to operating load case. On the other hand, a numerical solution is introduced with a user friendly, and simple graphic user interface. Three parametric finite element models are constructed for the composite filament-wound multilayered pressure vessel to represent pure pressure, operating and
hydro-test load cases. Commercial software ANSYS Workbench 17.0 and table of design points are used for the analysis employing ANSYS Composite PrepPost™ (ACP) plugin for simulation of composite laminates and study the structural performance attributes based on Tsai-Wu failure criteria.
Throughout the present study, 20 lay-up configurations are investigated and their corresponding optimum winding angles and thicknesses are calculated. The internal design pressure is considered 2 MPa for both pure and operating load cases and 3 MPa
iii for Hydro-test load case, while the structural wall thickness is calculated to achieve a safety factor value of (𝑆𝑓𝑎𝑙𝑙 = 2) based on pure pressure load case. The change in safety factor for both operating and hydro-test load cases is indicated.
The results reveal a good agreement between the results from FEM and the mathematical solution for both pure pressure and operating load cases. This built confidence towards
constructing parametric model for the hydro-test load case. ANSYS Workbench and ANSYS Composite PrepPost™ (ACP) have been proven to be very effective tool for constructing parametric models and, simulating multilayered filament-wound PVs respectively.
In addition, for all investigated lay-ups, the configurations which contain pure Carbon/Epoxy laminates show the least required number of laminates and consequently the least minimum allowable structural wall thickness when subjected to pure pressure
load case. While, the hybrid unbalanced laminate lay-up [+54.7C, −54.7G]20s showed higher layers consumption when subjected to pure
pressure; it showed superior behavior and represent the optimum lay-up for PVs when it suffers from high external torsional nozzle loads may be exerted by interconnected piping.
Furthermore, all examined lay-ups reveal safe design when exposed to hydro-test load case, when lay-ups with a higher content of axial-oriented layers show distinct behaviour and higher resistance to fluid weight content. This made them the best choice for applications with higher fluid content/density.