Size Effects in Winding Roll Formed Profiles: A Study of Carcass Production for Flexible Pipes in Offshore Industry

2013 ◽  
Vol 549 ◽  
pp. 117-124 ◽  
Author(s):  
Peter Søe Nielsen ◽  
Morten Storgaard Nielsen ◽  
Nils Bay
Keyword(s):  
Degrees Of Freedom ◽  
Oil And Gas ◽  
Target Location ◽  
Roll Forming ◽  
Fe Model ◽  
Element Analysis ◽  
Flexible Pipes ◽  
Offshore Industry ◽  
Offshore Oil And Gas ◽  
Offshore Oil

Carcass production of flexible offshore oil and gas pipes implies winding and interlocking of a roll formed stainless steel profile around a mandrel in a spiral shape. The location of the dividing point between the left and right half of the s-shaped profile in the finished carcass is very important as it directly influences carcass flexibility. The target location of the dividing point can be difficult to achieve since undesired degrees of freedom in the winding stage allows the profile to change geometry. The present work investigates this issue by performing production tests of a single carcass profile size on three mandrel sizes showing a size effect to be evident; smaller mandrel size increases a shift of the dividing point during initial mandrel contact in the winding stage. The cause is high strains in the open profile, which are minimized by the material moving closer to profile neutral plane. Other parameters such as profile entry angle on the mandrel and spiral pitch are likely to have significant importance. Proper dividing point position is shown to be obtainable by adjusting the profile in the roll forming stage. The profile rolling is successfully modeled by Finite Element Analysis (FEA), whereas a simplified FE-model of the subsequent winding operation shows that full interlock modeling is required for proper prediction of profile deformation.

Identifying Key Safety Culture Factors for the Offshore Industry

2021 ◽  
Author(s):  
Ning Lou ◽  
Ezra Wari ◽  
James Curry ◽  
Kevin McSweeney ◽  
Rick Curtis ◽  
...  
Keyword(s):  
Safety Culture ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Transportation Safety ◽  
Key Factors ◽  
Gas Industry ◽  
The Us ◽  
Offshore Industry ◽  
Offshore Oil And Gas ◽  
Offshore Oil

This research identifies key factors, or safety culture categories, that can be used to help describe the safety culture for the offshore oil and gas industry and develop a comprehensive offshore safety culture assessment toolkit for use by the US Gulf of Mexico (GoM) owners and operators. Detailed questionnaires from selected safety culture frameworks of different industries were collected and analyzed to identify important safety culture factors and key questions for assessment. Safety frameworks from different associations were investigated, including the Center for Offshore Safety (COS), Bureau of Safety and Environmental Enforcement (BSEE), and the National Transportation Safety Board (NTSB). The safety culture factors of each of these frameworks were generalized and analyzed. The frequency of the safety culture factors in each framework was analyzed to explore commonality. The literature review and analysis identified a list of common factors among safety culture frameworks.

scholarly journals An In-depth Analysis for Optimal Cable Tray Support Span

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Erkan Oterkus ◽  
Sung Wuk Jung
Keyword(s):  
Finite Element ◽  
Oil And Gas ◽  
Element Analysis ◽  
Depth Analysis ◽  
Manual Handling ◽  
Offshore Oil And Gas ◽  
The Cost ◽  
Optimal Span ◽  
Offshore Oil ◽  
Modelling Approach

Nowadays, it is crucial to reduce the cost of the overall project so that the competitiveness of offshore oil and gas without compromising on quality or safety can be achieved. This study investigates how to define the longest cable tray support span considering constructability in order to reduce the number of supports which is a chief cost of a cable tray system. This study presents not only material and geometry frequently used for cable tray but also the formula to estimate the maximum cable load which can be installed within cable tray. To verify the longest span without increasing the strength(thickness) of cable tray, finite element modelling approach was employed based on ANSYS and comparisons were made between numerical analysis and simplified hand calculation. The constructability for the longer span obtained from finite element analysis has been validated in view of manual handling of the cable tray. It is shown that the optimal span suggested in this paper can lead to a better economic benefit without degrading the constructability. For instance, as the span is longer, the cost of material as well as construction manpower can be saved. It is also expected that this approach will contribute to enhance the competitiveness of offshore oil and gas.

Comparison Study of Different Floater Effect on Deepwater SCR

2008 ◽  
Author(s):  
Yongqiang Dong ◽  
Liping Sun
Keyword(s):  
Oil And Gas ◽  
Configuration Design ◽  
Comparison Study ◽  
Element Analysis ◽  
Steel Catenary Riser ◽  
Campos Basin ◽  
Analysis Technique ◽  
Global Configuration ◽  
Offshore Oil And Gas ◽  
Offshore Oil

With the development of deepwater offshore industries, Steel Catenary Riser (SCR) offers great advantages over other risers and has been widely deployed. SCRs have been installed and in service in offshore oil and gas industries in the Gulf of Mexico, Campos Basin, Brazil and West of Africa since the 1990s. The platforms designed for SCRs range from semi-submersible, Spar, TLP to FPSO. Severe motions of a floating host facility such as a TLP, FPSO or other platform may have implications for the strength and fatigue life of SCR. To better understand the effect of floater motion on deepwater SCR, a comparison study of such effect was conducted. Three typical floaters including semi-submersible, Spar and TLP were selected for comparison purpose. An identical SCR was assumed for all floaters in order to make comparison on the same basis. Study focus was given to the strength and motion fatigue analysis. To illustrate the floater effect on SCR performance, an example was given for an 8.625 inches diameter SCR. Detail finite element analysis were performed by use of ABAQUS. It was found that the floater motion has significant impact on SCR’s both strength and fatigue. Among the selected floaters, it was found that semi-submersible and Spar are much more friendly to SCR, while TLP makes SCR design more challenging. In addition, the effect of different floater concept on SCR global configuration design was also discussed. Meanwhile, the analysis technique was also discussed through this study. It is concluded that focus should be given to SCR motion fatigue and strength for different platforms.

FLOATING PRODUCTION, STORAGE AND OFFLOADING FACILITIES—IMPACT OF THE NEW OIL TANKER CONSTRUCTION RULES

1994 ◽  
Vol 34 (1) ◽  
pp. 178
Author(s):  
Robin C. Gehling ◽  
Michael P. Lane ◽  
Robert M. Thornton
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Cooperative Effort ◽  
Gas Industry ◽  
Safety Certification ◽  
Offshore Industry ◽  
Offshore Oil And Gas ◽  
Oil Tankers ◽  
Offshore Oil ◽  
Double Hull

FPSOs are often converted from, and carry ship safety certification as, oil tankers. The two types of ship have been reasonably compatible until passage in early 1992 of new international requirements for tankers to be constructed or converted to double hull requirements and for existing vessels to be phased out when they have been in service for 25 to 30 years. Such requirements, which have become increasingly onerous since 1973, are based on the hazards involved in navigation of oil tankers and do not reflect the risks applying to FPSO operations.In cooperation with the Australian offshore industry, AMSA made a number of submissions to the International Maritime Organisation (IMO), seeking clarification on whether FPSOs should be subjected to the rules for oil tankers. To cover the possibility that it is confirmed that FPSOs should comply with the rules, the submission proposed modifications to those rules to reflect the FPSO operating environment.The submissions resulted in IMO deciding, in March 1993, that although FPSOs would continue to be treated as oil tankers, they would not be required to comply with the double hull requirements which could have necessitated their withdrawal from service upon reaching 30 years of age.Achievement of a successful conclusion to this project has involved a cooperative effort between AMSA and the offshore oil and gas industry.

Can the Caspian Sea Survive its Own Oil? Environmental Regulation of the Offshore Oil and Gas Industry in the Caspian Sea

2014 ◽  
Vol 29 (3) ◽  
pp. 415-456
Author(s):  
Elena Karataeva
Keyword(s):  
Caspian Sea ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
The Caspian Sea ◽  
Gas Industry ◽  
Industry Regulation ◽  
Regulatory Frameworks ◽  
Offshore Industry ◽  
Offshore Oil And Gas ◽  
Offshore Oil

This article critically examines the shortcomings of the offshore industry regulation in the Caspian Sea and proposes a framework to strengthen it. It considers the hydrocarbon industry and resources of the Caspian Sea region and analyses the extent and impacts of Caspian offshore oil and gas activities on its environment, reviews selected regional and global regulatory frameworks for the offshore oil and gas industry and their effectiveness, discusses existing shortcomings of the national and regional regulation of the Caspian offshore oil and gas industry, and provides suggestions on how it could be improved, drawing on the experience and regulatory formulations from other regions of the world.

scholarly journals British Columbia Offshore Oil and Gas Law

2003 ◽  
Vol 41 (1) ◽  
pp. 101
Author(s):  
Al Hudec ◽  
Van Penick
Keyword(s):  
British Columbia ◽  
West Coast ◽  
Oil And Gas ◽  
Regulatory Regime ◽  
Current Debate ◽  
The West ◽  
History Of ◽  
Offshore Industry ◽  
Offshore Oil And Gas ◽  
Offshore Oil

This article addresses the current debate over lifting a thirty-five year moratorium on offshore resource development in British Columbia. It describes the three primary offshore basins and the history of the various moratoriums, as well as the current legal backdrop under which development could occur. The authors review unique jurisdictional, Aboriginal and environmental considerations relating to the west coast, and conclude that the east coast regulatory regime provides a useful regulatory template for the west coast, appropriately updated for technological changes in the offshore industry and changes in regulatory philosophies since the 1980s.

Evaluation of Inherent Safety Potential in Offshore Oil and Gas Activities

2004 ◽  
Author(s):  
Faisal I. Khan ◽  
Brian Veitch ◽  
Paul R. Amyotte
Keyword(s):  
Oil And Gas ◽  
Explosion Hazard ◽  
Inherent Safety ◽  
Risk Minimization ◽  
Process Industries ◽  
Hazard Management ◽  
Offshore Industry ◽  
Offshore Oil And Gas ◽  
Simple Technology ◽  
Offshore Oil

The inherent safety approach is the best option for hazard/risk management in offshore oil and gas activities. Some of the main drivers for inherent safety in the offshore industry are to reduce manning levels and provide minimum facilities installations, encourage the use of compact and simple technology, and reduce the need for operators to be present. Though this approach is comparatively mature and has been widely accepted in onshore process industries, its applications in offshore industries are still limited. A recent pilot study to assess the extent to which the concept and principles of inherent safety are being applied in the development and design of offshore oil and gas installations revealed that the term inherent safety is only just beginning to be recognized in the industry, mainly as a result of its inclusion in the Design Safety Case Guidance, and the UKOOA Fire and Explosion Hazard Management Guide. There appears to be a number of subtle but significant differences of opinion as to what inherent safety is, including ‘hazard avoidance’, ‘hazard prevention’, ‘risk minimization’, and ‘good engineering’. While all of these may form part of an inherently safer strategy, they do not encompass a full understanding of the role of inherent safety. This paper discusses inherent safety in offshore oil and gas activities and presents methods to evaluate inherent safety potential. It also highlights areas for further research.

Tensile Response of a Flexible Pipe With an Incomplete Tensile Armor Layer

2021 ◽  
Vol 143 (5) ◽  
Author(s):  
Xiaohua Zhu ◽  
Qinglong Lei ◽  
Yu Meng ◽  
Xiaoxuan Cui
Keyword(s):  
Oil And Gas ◽  
Production Systems ◽  
Element Model ◽  
Flexible Pipe ◽  
Flexible Pipes ◽  
Safety And Reliability ◽  
Oil And Gas Resources ◽  
Offshore Oil And Gas ◽  
Unbonded Flexible Pipes ◽  
Offshore Oil

Abstract Unbonded flexible pipes are widely utilized in the exploitation of offshore oil and gas resources. They are connected to two of the most critical types of system: floating production platforms and underwater production systems. However, if some tensile armor wires are substituted by cables or broken, the tensile armor layer will be incomplete, which seriously reduces the safety and reliability of the flexible pipe. In the present study, models of a flexible pipe with a complete tensile layer and with the tensile layer partially missing were established. The error for the tensile stiffness obtained by the finite element model of an intact flexible pipe was only 1% compared with experimental results. Because the load borne by the inner tensile armor layer is larger under tension than that borne by the outer tensile armor layer, the loss of inner tensile armor wires has a greater impact on the tensile properties. The maximum axial elongation of the flexible pipe increases with the number of missing inner tensile armor wires as a cubic polynomial. If the distribution of the missing armor wires is too dense, a stress concentration and local bending may occur, which will reduce the tensile strength of the flexible pipe.

scholarly journals INTERNATIONAL LEGAL STATUS OF THE OFFSHORE MOBILE OIL AND GAS INSTALLATIONS

2019 ◽  
Vol 23 (4) ◽  
pp. 510-532
Author(s):  
Nikita S. Abramov
Keyword(s):  
Legal Status ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Legal Framework ◽  
Status Change ◽  
Dual Approach ◽  
Offshore Industry ◽  
Offshore Oil And Gas ◽  
Definition Of ◽  
Offshore Oil

Mobile offshore oil and gas installations are the essential infrastructural facilities for the oil and gas industry. The present-day offshore installations are able to explore, extract, store and offload hydrocarbons, thus ensuring the complete cycle of offshore fields development. Nonetheless, multifunctionality of mobile oil and gas installations makes it difficult to define their international legal status. Under the UNCLOS 1982, the mobile offshore oil and gas installations international status is uncertain. Due to dualistic nature, the mobile installations should be considered under the category of “instal- lations” during the hydrocarbons exploration and exploitation operations and be classified as “ships” while navigating. The article seeks to analyse a set of international law provisions, that define the mobile offshore oil and gas installations international legal status. It is intended to assess whether the existing legal regulations meet the needs of a present-day offshore industry. To this end, the article addresses the relevant provisions of international maritime conventions, that define the status of mobile oil and gas installations in accordance with their object and purpose. The study finds that there are at least four distinct approaches towards the definition of the mobile installations international legal status. The author concludes that the differentiated approaches towards the definition of the mobile installations international legal status for the object and purpose of the various maritime treaties is a substantial shortcoming of the applicable international legal framework. The study attempts to make the case for unification of a “dual approach”, that treats mobile offshore units as an “installations” or “ships” depending upon the function preformed. Elaborating further on the unification proposal the author argues for the improvement of the “dual approach” through the specific process-related criteria, that establish the exact moment of the international legal status change.

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