Abstract As marine renewable energy technologies developing, there is a growing need for transportation systems. During offshore operations, deep sea risers can be subjected to excessive environmental loadings, causing operational risks. In this study, hydrodynamic loads, caused by in situ currents, acting on riser under real-world conditions were modelled and examined, with experimental data b...

The deepwater drilling riser is a very important and vulnerable connection between an offshore platform subsea wellhead. Under some certain complex marine environment operating conditions, the may drift beyond safe limitations or be driven away rapidly. In order to protect safety of platform, personnel equipment, it necessary implement emergency disconnection riser. Since stretched under normal...

The behavior of different mooring line materials has a significant influence on the system and, consequently, dynamic responses floating platform. Although there have been previous studies FPSOs and their systems, failure scenarios associated with received less attention, particularly for turret-moored taut moorings. Thus, this paper investigates in intact, single-line, double-line damaged cond...

The increasing energy demand has led to more explorations in the oil and gas industry. To achieve this, marine risers pipelines are used convey fluid other resources meet demand. In recent years, hybrid flexible composite have become adaptable. Flexible already proven be a popular riser solution for various floating production systems shallow deepwater many parts of world due their good dynamic...

This paper presents an experimental characterisation of fatigue at welded connections for the next-generation high-strength low-alloy offshore riser steel, X100Q. An instrumented girth weld is conducted with a parallel programme physical-thermal simulation (Gleeble) to develop heat affected zone (HAZ) test specimens. X100Q shown exhibit superior performance current state art X80. Significant di...

We review some recent work on fiber-optic sensors for the high-speed railway environment. In particular, we show convenient fiber-optic solutions for rail and wheel monitoring, perimeter security and catenary protection in changeover sections. OCIS codes: (060.2370) Fiber optic sensors; (060.3735) Fiber Bragg gratings

Flow fields around reformed earth embankment windbreak walls (REEWWs) with five different porosities under crosswind were studied using the improved delayed detached eddy simulation (IDDES) based on SST ?-? turbulence model by computational fluid dynamics (CFD) in this paper. Based simulated flow field results, finite element method (FEM) was adopted to analyze wind-induced displacement of cate...

There is accelerating interest in composite risers for deepwater applications. Composite risers offer much higher strength to weight ratios over metallic risers but there is less experience of their behavior in deepwater environments. A general review on current developments specific to composite risers highlighting the remaining challenges and the applications, design evolution, state-of-the-a...

the steger and warming flux vector splitting implicit scheme is used to numerically solve two dimensional reynolds averaged navier–stokes (rans) equations governing the vortex induced vibration of a flexible riser laterally supported by a spring and a damper. the k–ε model is used as turbulence model to simulate the turbulent flow in the wake of the riser. to update the new position of the rise...

In this paper the influence of inlet and outlet configurations a pseudo-2D fluidized riser on hydrodynamics (i.e. flow pattern cluster characteristics) are studied. A detailed comparison between experimental data full 3D CFD-DEM simulation results is performed. Solids volume fraction mass flux characterized particle clusters detected in our simulations compared to data. It shown that correct re...