Pure Bending Behavior of Pipe Reinforced by Steel Wires (PSP)

2016 ◽  
Author(s):  
Gao Tang ◽  
Weidong Ruan ◽  
Ting Huang ◽  
Yutian Lu ◽  
Yong Bai
Keyword(s):  
Oil And Gas ◽  
Virtual Work ◽  
Steel Wire ◽  
Oil And Gas Industry ◽  
Theoretical Method ◽  
Pure Bending ◽  
Gas Industry ◽  
Offshore Installations ◽  
Bending Behavior ◽  
Offshore Oil And Gas

Plastic pipe reinforced by helically cross-winding steel wire (PSP) is a composite pipe, which is being applied into the offshore oil and gas industry. However, PSPs are often subjected to bending loading during the reeling process and offshore installations, which may lead to elliptical buckling due to the Brazier effect. Thus the ovalization instability of PSP under pure bending was investigated in this paper. According to the nonlinear ring theory, the ovalization growth of cross section during bending was studied. Then, the formulation was developed based on the principle of virtual work and was efficiently solved by Newton-Raphson method. Besides, a simplified method was proposed to simulate the behavior of steel wire reinforced layer. To verify the accuracy of the theoretical method, an ABAQUS model was employed to simulate the buckling response of PSP under pure bending. The results obtained from the theoretical method were compared with ABAQUS simulation results, and they show excellent agreements. The results can be used for predicting PSP’s bending behavior in offshore engineering applications.

Potential Galloping Motions of Piggyback Pipeline Geometries in Strong Currents

2012 ◽  
Author(s):  
Adeshina Elegbede ◽  
Ove T. Gudmestad
Keyword(s):  
Oil And Gas ◽  
Angle Of Attack ◽  
Oil And Gas Industry ◽  
Electrical Heating ◽  
Equivalent Diameter ◽  
Flow Induced Vibration ◽  
Gas Industry ◽  
Offshore Installations ◽  
Offshore Oil And Gas ◽  
Offshore Oil

Piggyback configurations of pipelines, such as a Direct Electrical Heating (DEH) cable mounted on production flowlines, are becoming a common occurrence in the offshore oil and gas industry and they have been observed to excite into a type of flow-induced vibration called galloping in the presence of strong currents at free span locations. This work was aimed at studying potential flow induced galloping vibrations of piggyback type of pipelines commonly used on offshore installations in the oil and gas industry. Tests were carried out in a 12m long, 0.7m wide and 1.2m deep current flume tank located at the NTNU/SINTEF Hydrodynamic Laboratory in Trondheim, Norway. The tank has a test rig with cylinders suspended horizontally on a set of springs mounted on it. Reduced velocities were ranging from 4 to 15, depending on the equivalent diameter of the piggyback pair. In this experimental work, the effects of different diameter ratios and the angle of attack of the flow on the cylinders arranged normal to the flow were investigated. Three different diameter ratio cases were investigated: D+0.5D, D+0.32D and D+0.25D. Attack angles 0°, 30°, 60°, 90°, 120°, 150° and 180° were tested for these 3 diameter ratios giving a total of 21 test cases. The results obtained show that, for all cases of diameters ratios, high response amplitude ratios, as high as 1.7, can occur at reduced velocities less than 10 when the angle of attack is at 90°. It was also observed that vibrations that are characteristic of galloping instabilities occurred at an attack angle of 180° for the D+0.5D and the D+0.32D configurations. For the D+0.25D case, the response amplitudes were similar to a VIV situation. Comparing the response of the different diameter ratios show that the largest pipeline to piggyback ratio gives the largest responses for all attack angles.

Introducing IO in a Drilling Company

2013 ◽  
pp. 370-388 ◽  
Author(s):  
Grethe Osborg Ose ◽  
Trygve J. Steiro
Keyword(s):  
Oil And Gas ◽  
New Technology ◽  
Oil And Gas Industry ◽  
Safety Level ◽  
Gas Industry ◽  
Offshore Installations ◽  
The Status ◽  
Offshore Oil And Gas ◽  
Integrated Operations ◽  
Offshore Oil

The introduction of Integrated Operations (IO) in the offshore oil and gas industry makes distanced and distributed decision-making a growing part of normal work. Some functions have been transferred from offshore installations to onshore offices as a consequence of the technologies that have recently become available. The authors analyze whether the onshore organization is ready for increased responsibilities by increasing the resilience in its work patterns, since resilience is important for maintaining or increasing safety level compared to current operation, where personnel on board installations can observe the plant at first hand. This study has been performed as a case study of an onshore Support Center in a drilling company at the start of the process of using the Support Center. The establishment of the Support Center involved re-arranging the office arrangements to an open landscape for all offshore installation support personnel and grouping them according to disciplines. They also acquired new technology, including video conference equipment. Important findings are that developing resilience has to be followed through at all levels of the organization. Time and resources have to be made available when work practices change, providing the physical framework alone does not improve resilience. The study also offers a more detailed description of capability resilience and which aspects should be considered when developing resilience. The authors look at the status so far in the change process and also find areas that should be developed in order to increase resilience further.

Bending Behavior of Reinforced Thermoplastic Pipe

2015 ◽  
Vol 137 (2) ◽  
Author(s):  
Yong Bai ◽  
Binbin Yu ◽  
Peng Cheng ◽  
Nuosi Wang ◽  
Weidong Ruan ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Virtual Work ◽  
Engineering Application ◽  
Oil And Gas Industry ◽  
Theoretical Method ◽  
Point Of View ◽  
Material Behavior ◽  
Gas Industry ◽  
Practical Applications ◽  
Inelastic Material

Reinforced thermoplastic pipe (RTP) is a composite thermoplastic pipe, which is increasingly being used in oil and gas industry. In practical applications, RTPs inevitably experience bending during reeling process and offshore installation. The ovalization instability of RTP under pure bending was investigated. Several fundamental assumptions of RTP were proposed from the engineering application point of view. Then, based on nonlinear ring theory initially proposed by Kyriakides et al., the effect of transverse deformation through the thickness was introduced, and the ovalization growth of cross section during bending was studied according to nonlinear kinematics. The formulation was based on the principle of virtual work and was solved by a numerical solution. Inelastic material behavior of high density polyethylene (HDPE) was included, and a simplified method was proposed to simulate the behavior of fiber reinforced layer. A detailed Abaqus model was established using solid and truss elements to simulate the HDPE layer and reinforced fiber, respectively. The results obtained from the theoretical method were compared with Abaqus simulation results and test data of verification bending experiment and the results show excellent agreement. The proposed methods are helpful for RTP's engineering applications.

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.

Sign in / Sign up

Export Citation Format

Share Document