نتایج جستجو برای: subsea pipeline
تعداد نتایج: 30273 فیلتر نتایج به سال:
A redundant Field Programmable Gate Array (FPGA) based controller for subsea Blowout Preventer (BOP) is presented. Triple modular redundancy technique is used for architecture design, since high reliability is a necessary requirement for subsea BOP control system. A multiprocessor system is developed to enhance reliability of the processors and performance of the system. In addition, the shared...
Large deformation causing damage due to uplift force is generated in buried pipeline located in shallow trenches in marshes and saturated soils. In this paper, existing common methods of pipeline anchorage are discussed and considering advantages and disadvantages of these methods, a new method of pipeline anchorage are studied and presented. In this new developed method, geo-textile materials ...
Subsea structures are typically supported on mud mat type foundation systems. Traditional approaches for mud mat foundation stability analysis consider calculating the factors of safety using the classical methods given in API RP 2A or the more recent API RP 2GEO. Due to the inherent uncertainties in soil properties and subsea structure forces, conservative factors are generally required, conse...
Subsea systems used in combination with host facilities, such as floating, production storage and offloading units (FPSOs), tension leg platforms (TLPs), spars or compliant towers employ supervisory control and data acquisition (SCADA) systems whose architectures differ from SCADA systems found on conventional platforms. In these systems, programmable logic controllers (PLCs) located on the hos...
Natural frequencies, mode shapes and modal damping ratios must be estimated to assess subsea pipeline spans for vortex-induced vibrations (VIV) response direct wave loading. Several approximate solutions exist a linearly elastic pipe under constant axial force supported by springs beyond the span's shoulders. An exact analytical solution has only recently been published. That is used here in Ra...
Various forms of Autonomous Underwater Vehicles (AUVs) have evolved to solve different subsea mission requirements, these can be loosely grouped into two types: torpedo style AUVs and hovering AUVs. Torpedo AUVs were initially developed to be launched from torpedo tubes and consequently resemble torpedoes with a propeller and control surfaces at the rear, these vehicles have poor slow speed man...
Natural CO2 releases from shallow marine hydrothermal vents are assumed to mix into the water column, and not accumulate into stratified seafloor pools. We present newly discovered shallow subsea pools located within the Santorini volcanic caldera of the Southern Aegean Sea, Greece, that accumulate CO2 emissions from geologic reservoirs. This type of hydrothermal seafloor pool, containing highl...
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