Reliability analysis of the electrical control system of a subsea blowout preventer (BOP) stack is carried out based on Markov method. For the subsea BOP electrical control system used in the current work, the 3-2-1-0 and 3-2-0 input voting schemes are available. The effects of the voting schemes on system performance are evaluated based on Markov models. In addition, the effects of failure rat...

This article is devoted to the construction of offshore pipelines, taking into account protection environment. Initially, information was provided on conditions pipelines. Then there a discussion about methods laying their pros and cons, therefore choice method, which economically viable takes We know that main factor in choosing any method submarine pipeline economic environmental factors. Und...

This paper briefly summarizes that during the depressurization operation in subsea pipeline for maintenance or prevention of hydrate formation, because flare knock-out drum pump is designed ambient temperature, and cannot deal with low temperature fluid process. Therefore, needs to be heated meet requirement pump. In order avoid volume exceeding surge drum, concept multi stage innovatively prop...

This paper presents a quantitative reliability and availability evaluation method for subsea blowout preventer (BOP) system by translating fault tree (FT) into dynamic Bayesian networks (DBN) directly, taking account of imperfect repair. The FTs of series system and parallel system are translated into Bayesian networks, and extended to DBN subsequently. The multi-state degraded system is used t...

Pipeline lateral Out-of-Straightness (OoS) can act as buckle trigger in unburied (exposed) subsea pipelines. Determining the Critical Buckling Force (CBF) of pipeline is a computationally challenging task due to inherent uncertainties contributing parameters which requires utilising reliability-based approaches. This implies need for novel framework develop response surface (RS) CBF nominally s...

Smart isolation devices (SIDs) are commonly used in pressurized subsea pipelines that need to be maintained or repaired. The sudden stoppage of the SID may cause large water hammer pressures, which threaten both pipeline and SID. This paper proposes a simulation method by using coupled dynamic mesh technique simulate pressures pipeline. Unlike other simulations, this is first with moving object...

Subsea pipelines and wells installed to support the oil gas industry represent some of most extensive numerous anthropogenic structures throughout global marine ecosystems. There remains a paucity information on habitat value these for fishery target species and, as result, little understanding how decommissioning should be conducted minimise impacts populations economically socially important ...

Subsea pipelines carry oil or natural gas over long distances of the seabed, but fluid leakage due to a failure pipeline can culminate in huge environmental disasters. Scouring process may take place beneath current and/or wave action, causing suspension and leading risk failure. The resulting morphological variations seabed propagate not only below normally also along itself. Therefore, 3D sco...

In the process of oil exploitation, subseatrees sometimes vibrate. this paper, fluid–structure coupling software was used to study causes subsea tree vibration. First, complex model simplified, and ageometric grid established for calculation. Then, under given two working conditions, Fluent analyze pressure velocity distribution pipeline’s flow field. It found that field changed greatly at vari...