scholarly journals Numerical prediction of structural damage due to pressure buildup in subsea oil and gas equipment

2021 ◽  
Vol 11 (6) ◽  
pp. 2691-2707
Author(s):  
Ramechecandane Somassoundirame ◽  
Eswari Nithiyananthan
Keyword(s):  
Boundary Condition ◽  
Thermal Expansion ◽  
Steady State ◽  
Structural Analysis ◽  
Structural Damage ◽  
Oil And Gas ◽  
Numerical Prediction ◽  
Cfd Analysis ◽  
Pressure Buildup ◽  
Pipe Line

AbstractPressure buildup/annular pressure buildup in subsea oil and gas equipment occurs primarily due to the thermal expansion of trapped liquids. With the advent of modern computers, it has become increasingly possible to numerically analyze such problems with commercial codes available in the market. The objective of the present study is to propose a methodology for numerical prediction of structural damage in subsea oil and gas equipment due to pressure buildup. A judicious combination of computational fluid dynamics (CFD) with structural finite element analysis code has been used to perform a sample numerical analysis that is truly representative of a wide class of problems encountered in subsea oil and gas applications. The mitigation of trapped pressure is one among the prime areas of concern in the subsea oil and gas industry. In the present study, CFD analysis is used to determine the maximum pressure buildup due to the thermal expansion of trapped liquids in small leak tight enclosed volumes with rigid walls and the pressure obtained is used as a boundary condition for the structural analysis. In a nutshell, the analysis has been split into three steps (1) a steady-state CFD analysis to determine the temperature distribution within the oil and gas equipment under consideration, (2) the temperature contours obtained from the steady-state analysis are imposed as a boundary condition for the transient analysis to calculate the trapped pressure in the small volumes of interest and finally and (3) a structural analysis is used to determine the damage to the oil and gas equipment. The methodology adapted is similar to a one-way coupled fluid structure interaction analysis, but provides the added advantage of a significant reduction in computational cost. In the present study, the proposed methodology has been extended to a subsea Christmas tree (XT) and the pressure buildup in the hydraulic lines has been calculated. The results obtained using the present technique has been compared with analytical solution. The proposed numerical technique can be applied to any subsea or surface oil and gas equipment where pressure buildup due to trapped volume is a major issue. The findings of this study can help for better understanding of pressure buildup in trapped volumes within subsea/surface oil and gas equipment. This study can be applied to predict the thermal expansion of trapped volumes in subsea XTs, manifolds, pipe line end manifolds (PLEM) and pipe line end termination (PLET) units.

scholarly journals Steady state CFD analysis of heat transfer coefficient in pressurised pipes of super-heater of OP210 steam boiler

2018 ◽  
Vol 240 ◽  
pp. 05008 ◽  
Author(s):  
Mariusz Granda
Keyword(s):  
Heat Transfer ◽  
Boundary Condition ◽  
Heat Transfer Coefficient ◽  
Steady State ◽  
Transfer Coefficient ◽  
Saturated Steam ◽  
Steam Boiler ◽  
Cfd Analysis ◽  
Convergence Criteria ◽  
Super Heater

The aim of the paper is Computational Fluid Dynamics (CFD) analysis of Wall Heat Transfer Coefficient (WHTC) of pressurized pipe as a part of super-heater of the OP210 boiler. The object of the investigation is convection from saturated steam to the wall of the pipe, which works under high pressure and high temperature. The analysis is an approach to obtain exact solutions of WHTC according to the third type boundary condition compared to direct results from CFD analysis. The paper consists of three-step approach typical for CFD analysis: (i) Pre-Processing, the most elaborated part of the analysis where knowledge about super-heaters, turbulence, velocity profile is important to 3D model, mesh and boundary condition definition. (ii) Simulation of steady state turbulent flow until convergence criteria are met. (iii) Post-Processing where different approaches to the WHTC are shown in comparison. Also, the investigation includes two different types of meshes (where a different number of inflation layers are used) and comparison between k-epsilon and Solid Shear Stress (SST) turbulence model.

On the generalized Forchheimer—Stokes—Fourier systems under the Beavers—Joseph—Saffman boundary condition

2013 ◽  
Vol 143 (1) ◽  
pp. 101-120
Author(s):  
Luisa Consiglieri
Keyword(s):  
Thermal Conductivity ◽  
Boundary Condition ◽  
Porous Medium ◽  
Thermal Expansion ◽  
Steady State ◽  
Boundary Value Problem ◽  
Temperature Dependence ◽  
Time Dependent ◽  
Physical Parameters ◽  
Nonlinear Character

A Stokesian fluid in motion along a porous medium saturated by the same fluid is modelled by the Beavers—Joseph—Saffman boundary-value problem to generalized Forchheimer—Stokes—Fourier systems: what we call the Beavers—Joseph—Saffman (BJS) problem. The model has nonlinear character given by the temperature dependence of physical parameters such as the viscosity, the permeability, the thermal conductivity and the thermal expansion. The paper is concerned with the study of the steady-state and the time-dependent regimes via the Galerkin and the Faedo—Galerkin techniques, respectively.

In-Line-Inspection (ILI) of a Pipeline in Constrained Condition and Establishing Integrity of the Pipeline

2021 ◽  
Author(s):  
Partha Bose
Keyword(s):  
Thermal Expansion ◽  
Natural Gas ◽  
Gas Pipeline ◽  
Bridge Structure ◽  
Site Specific ◽  
Integrity Assessment ◽  
Natural Gas Pipeline ◽  
Pipe Line ◽  
Specific Assessment ◽  
Mumbai City

Abstract One 24” Diameter and around 40 km length Natural Gas pipeline caters as energy life line for Mumbai city; supplying app 4.5 MMSCMD Gas for Auto Sectors (CNG), House Hold (PNG), Power, Fertiliser, Petrochemical Sectors. Though line is equipped with Launcher & Receiver; but onward became challenging one for executing pigging for many constraints: - Presence of One SR bend - Presence of 1.5 D bends - Presence of 1.5 D bends with Back to Back configuration - Three (3) no Thermal Expansion Loops, in 2 Km stretch passing as above ground pipeline through bridge (above Creek) section The pipe line is passing through High Consequence areas, including its interim stretch of 2km passing as above ground section through bridge structure. Intelligent pigging is an obvious first preference for online precise integrity assessment for any pipeline. Site Specific Assessment, Detail Engineering & Committed approach resulted in Feasibility & Development of ILI Tool, Practical Testing in fore hand before actual pigging & onward Integrity Assessment of the pipeline conducted by accomplishing Successful ILI run.

scholarly journals Integrity Management of Marine Structures; With Emphasis on Design for Structural Robustness

2018 ◽  
Author(s):  
Torgeir Moan
Keyword(s):  
Structural Damage ◽  
Structural Integrity ◽  
Oil And Gas ◽  
Offshore Structures ◽  
Design Standards ◽  
Limit States ◽  
Fabrication Errors ◽  
Integrity Management ◽  
Operational Errors ◽  
And Control

Based on relevant accident experiences with oil and gas platforms, a brief overview of structural integrity management of offshore structures is given; including an account of adequate design criteria, inspection, repair and maintenance as well as quality assurance and control of the engineering processes. The focus is on developing research based design standards for Accidental Collapse Limit States to ensure robustness or damage tolerance in view damage caused by accidental loads due to operational errors and to some extent abnormal structural damage due to fabrication errors. Moreover, it is suggested to provide robustness in cases where the structural performance is sensitive to uncertain parameters. The use of risk assessment to aid decisions in lieu of uncertainties affecting the performance of novel and existing offshore structures, is briefly addressed.

scholarly journals Self Governing Seep Out Robocar

2019 ◽  
Vol 8 (6S2) ◽  
pp. 446-451
Keyword(s):  
Carbon Dioxide ◽  
Oil And Gas ◽  
Security Framework ◽  
Synthetic Compounds ◽  
Major Aspect ◽  
Pipe Line ◽  
Oil And Gas Enterprises

A few pipelines transport different unsafe items, for example, synthetic concoctions, profoundly unstable fluids, and anhydrous alkali, or carbon dioxide. As per information from the 2018 NHIS-OHS, laborers utilized in mining and oil and gas enterprises had high commonness paces of introduction to conceivably unsafe work association attributes and risky synthetic compounds gas spills. In our task we are intending to recognize the careful area of the break. A gas spill locator is a gadget that identifies the nearness of gases in a region, as a major aspect of a word related security framework. This kind of hardware is utilized to identify a gas spill, warmth, fire and different emanations and can interface with a human. A controller can sound an alert to human in the region where the variation from the norm is happening, allowing them the chance to find the break without human hazard. This kind of gadget is significant in light of the fact that there are numerous gases that can be hurtful to human. This undertaking measures and alarms the specialist from this risk. The locator unit will be versatile vehicle based gear. This unit will move alongside the pipe line, screen the air and gives ready messages. The versatile security framework will consistently quantify the warmth, CO and H2S level in the environment or in shut zones where human are working[19],[20],[21]

End Reactions and Stresses in Three-Dimensional Pipe Lines

1937 ◽  
Vol 4 (2) ◽  
pp. A68-A74
Author(s):  
G. B. Karelitz ◽  
J. H. Marchant
Keyword(s):  
Thermal Expansion ◽  
Numerical Computation ◽  
Three Dimensional ◽  
Pipe Line ◽  
Steam Main ◽  
Pipe Lines

Abstract The authors present a method for the numerical computation of the end forces and couples in a three-dimensional pipe line. The method takes care of a pipe line with any number of straight parts connected by bends. A procedure of computation is also shown when parts of the pipe line are skewed. The ends of the line may be partially or completely constrained against rotation and translation. A construction for the analysis of stresses in the pipe bends is given. The method is illustrated by a sample computation of the end forces and couples in a steam main which is restrained against thermal expansion.

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