Riserless Light Well Intervention Operations in Harsh Environment - A Case Study from West of Shetland

2015 ◽  
Author(s):  
Terje A. Løver ◽  
Oddbjørn Bjerkvik
Keyword(s):  
Harsh Environment

Steel Lazy Wave Riser Configuration for Turret Moored FPSO With Disconnectable Turret in Deepwater

2015 ◽  
Author(s):  
Daniel Karunakaran ◽  
Sankar Subramanian ◽  
Rolf Baarholm
Keyword(s):  
Deep Water ◽  
Cost Effective ◽  
Attractive Alternative ◽  
Harsh Environment ◽  
Detailed Case ◽  
Effective Manner ◽  
Water Developments ◽  
Pros And Cons ◽  
Steel Catenary Risers

Recently turret-Moored FPSOs have been used in many deep water developments worldwide, with consideration of disconnectable turrets for harsh environment applications. This trend makes the interactions between FPSO and risers system more important. Further, Steel Lazy Wave Risers (SLWR), which is a compliant variant of the mostly commonly used Steel Catenary Risers (SCR), is becoming an attractive riser option. The paper provides a review of the various riser systems that can be considered for turret-moored FPSOs, and specific emphasis on Steel Lazy Wave Risers. A detailed case study of Steel Lazy Wave Risers for a typical turret moored FPSO with disconnectable turret is presented. This system is described in terms of design and functionalities, the fabrication and installation methods are presented. The case study shows clearly that SLWR are an attractive alternative to be used for FPSO with disconnectable turret and is very efficient to fabricate and install in a very cost effective manner. Pros and Cons for SLWR are discussed, with consideration of the particular challenges of turret-moored FPSOs with large floater motions, hang-off geometry constraints at turret, hang-off loads, riser interferences, risers pre-installation, and turret disconnection constraints.

Sensory Fuzzy Evaluation System Applied in the Cabs of Mine Vehicles

2014 ◽  
Vol 548-549 ◽  
pp. 1943-1946
Author(s):  
Zhe Chen ◽  
Neng Chang ◽  
Xue Liang Ma
Keyword(s):  
Evaluation System ◽  
Sensory Experience ◽  
Harsh Environment ◽  
Fuzzy Evaluation ◽  
Evaluation Theory ◽  
Evaluation Indexes ◽  
Multi Level

The cabs of vehicles used in mines are complex man-machine interfaces since those vehicles normally operated in harsh environment. Multi-level fuzzy evaluation theory is a method used to study these interfaces. This paper describes the user sensory experience theory, based on which we establish fuzzy evaluation indexes and man-machine fuzzy evaluation prototype . Then, the method to determine the levels of factor weights and the selected approach of fuzzy synthetic operation has been developed. Finally, a case study has been presented to evaluate certain types of mine vehicle cabs.

scholarly journals The role of detritivory as a feeding tactic in a harsh environment – a case study of weatherfish (Misgurnus fossilis)

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Kacper Pyrzanowski ◽  
Grzegorz Zięba ◽  
Małgorzata Dukowska ◽  
Carl Smith ◽  
Mirosław Przybylski
Keyword(s):  
Harsh Environment ◽  
Misgurnus Fossilis

The Tension Leg Semisubmersible (TLS): The Hybrid TLP-Semisubmersible Floater With the Spar Response

2014 ◽  
Author(s):  
Alaa M. Mansour ◽  
Chunfa Wu ◽  
Dhiraj Kumar ◽  
Ricardo Zuccolo
Keyword(s):  
Second Generation ◽  
State Of The Art ◽  
Service Condition ◽  
Harsh Environment ◽  
Ballast Tank ◽  
Execution Plan ◽  
Four Corners ◽  
Close Proximity ◽  
Service Conditions

The Tension Leg Semisubmersible (TLS) floater is the second generation of the Free-Hanging Solid Ballast Semisubmersible (FHSB Semi) design. The FHSB Semi is the state-of-the-art design that maintains the advantages of the conventional Semisubmersibles and provides the motions of Spars. The FHSB Semi design is a conventional semisubmersible with an added feature of a Free-Hanging Solid Ballast tank (SBT) located deep below the hull keel level and connected through four groups of chains (on its four corners) to the semisubmersible hull. During the pre-service conditions, the chains are used to retract the SBT and maintain it at a close proximity to the hull keel to facilitate the transportation and installation operations. Once the semisubmersible is moored in-place, the chain system is operated to lower the SBT to its desired elevation below the hull keel and maintain it permanently connected to the semisubmersible hull during the in-service condition. The SBT provides substantial in-water weight and added mass that significantly reduce the platform response and maintains the chains in tension. In this paper, detailed description of the Tension Leg Semisubmersible (TLS) design as the second generation of the FHSB Semi is presented. The paper also includes discussions on the proposed project execution plan for the TLS covering the fabrication, transportation and installation as well as the added risks and risk mitigations associated with the new semisubmersible design and execution. A case study is introduced where a TLS is used as a dry tree host for a field located at 6,000 ft of water in the central Gulf of Mexico (GoM) harsh environment.

The Genesis and Internal Dynamics of El Salvador's People's Revolutionary Army, 1970–1976

2014 ◽  
Vol 38 (01) ◽  
pp. 102-129
Author(s):  
ALBERTO MARTÍN ÁLVAREZ ◽  
EUDALD CORTINA ORERO
Keyword(s):  
Latin America ◽  
El Salvador ◽  
Early Years ◽  
Left Wing ◽  
Internal Dynamics ◽  
Internal Coherence ◽  
The 1960S

AbstractUsing interviews with former militants and previously unpublished documents, this article traces the genesis and internal dynamics of the Ejército Revolucionario del Pueblo (People's Revolutionary Army, ERP) in El Salvador during the early years of its existence (1970–6). This period was marked by the inability of the ERP to maintain internal coherence or any consensus on revolutionary strategy, which led to a series of splits and internal fights over control of the organisation. The evidence marshalled in this case study sheds new light on the origins of the armed Salvadorean Left and thus contributes to a wider understanding of the processes of formation and internal dynamics of armed left-wing groups that emerged from the 1960s onwards in Latin America.

Culture and the plasticity of perception

2020 ◽  
Vol 43 ◽  
Author(s):  
Michael Lifshitz ◽  
T. M. Luhrmann
Keyword(s):  
Cultural Context ◽  
Sensory Experience ◽  
Cultural Learning ◽  
The World

Abstract Culture shapes our basic sensory experience of the world. This is particularly striking in the study of religion and psychosis, where we and others have shown that cultural context determines both the structure and content of hallucination-like events. The cultural shaping of hallucinations may provide a rich case-study for linking cultural learning with emerging prediction-based models of perception.

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