Factory-applied anticorrosive insulation for large-diameter pipes

Large-diameter thick-walled steel pipes during their installation in deep-water are subjected to a combination of loading in terms of external pressure, bending and axial tension, which may trigger structural instability due to excessive pipe ovalization with catastrophic effects. In the present study, the UOE pipe manufacturing process, commonly adopted for producing large-diameter pipes of significant thickness, is considered. The study examines the effect of UOE line pipe manufacturing process on the structural response and resistance of offshore pipes during the installation process using nonlinear finite element simulation tools.

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High end inspection by filmless radiography on LSAW large diameter pipes

NDT & E International ◽

10.1016/j.ndteint.2009.11.004 ◽

2010 ◽

Vol 43 (3) ◽

pp. 206-209 ◽

Cited By ~ 12

Author(s):

Thomas Kersting ◽

Norbert Schönartz ◽

Ludwig Oesterlein ◽

Andreas Liessem

Keyword(s):

Large Diameter ◽

Large Diameter Pipes

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Effects of Pipe Diameter and Stokes Number on Erosion in Elbows

Volume 2: Fluid Mechanics; Multiphase Flows ◽

10.1115/fedsm2020-20318 ◽

2020 ◽

Author(s):

Soroor Karimi ◽

Alireza Asgharpour ◽

Elham Fallah ◽

Siamack A. Shirazi

Keyword(s):

Experimental Data ◽

Oil And Gas ◽

Learning Algorithm ◽

Large Diameter ◽

Stokes Number ◽

Gas Production ◽

Flow Conditions ◽

Cfd Simulations ◽

Oil And Gas Production ◽

Large Diameter Pipes

Abstract Large diameter pipes and elbows are vastly used in industry especially in mining and oil and gas production. Solid particle erosion is a common issue in these pipelines, and it is important to predict it to avoid failures. Currently, laboratory experiments reported in the literature are limited to diameters less than 4 inches. Therefore, there is not much experimental data available for large diameter elbows. However, the erosion can be predicted by CFD simulations and applying erosion equations in such elbows. The goal of this project is to examine the effects of elbow diameter and Stokes number on erosion patterns and magnitude for various flow conditions for elbow diameters of 2, 4, 8, and 12 inches. The approach of this work is to first perform CFD simulations of liquid-solid and gas-solid flows in 2-inch and 4-inch elbows, respectively, and evaluate the results by available experimental data. Then CFD simulations are carried for 2, 4, 8, and 12-inch standard elbows for various Stokes numbers corresponding to gas dominant flows with the velocity of 30 m/s, and liquid dominant flows with the velocities of 6 m/s. For gas dominant flows erosion in air and for liquid dominant flows erosion in water is investigated. All these simulations are carried for four particle sizes of 25, 75, 150, and 300 microns. The results indicate that Stokes number and diameter of elbows have significant effects on erosion patterns as well as magnitudes in this geometry. This work will have various applications, including validating mechanistic models of erosion predictions in elbows and developing an Artificial Intelligence (machine learning) algorithm to predict erosion for various flow conditions. Such algorithms are limited to the range of conditions they are trained for. Therefore, it is important to expand the database these codes are accessing. Overall, the CFD database of large diameter elbows will reduce the computational costs in the future.

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Development on Simulation Method for Two-Phase Flow in Large Diameter Pipes With 90 Degree Elbows

Volume 1: Beyond Design Basis; Codes and Standards; Computational Fluid Dynamics (CFD); Decontamination and Decommissioning; Nuclear Fuel and Engineering; Nuclear Plant Engineering ◽

10.1115/icone2020-16747 ◽

2020 ◽

Author(s):

Yoshiteru Komuro ◽

Atsushi Kodama ◽

Yoshiyuki Kondo ◽

Koichi Tanimoto ◽

Takashi Hibiki

Keyword(s):

Flow Regime ◽

Fluid Model ◽

Large Diameter ◽

Simulation Method ◽

Phase Flow ◽

Two Phase ◽

Diameter Pipe ◽

Two Fluid Model ◽

Large Diameter Pipes ◽

Two Fluid

Abstract Two-phase flows are observed in various industrial plants and piping systems. Understanding two-phase flow behaviors such as flow patterns and unsteady void fraction in horizontal and vertical pipes are crucial in improving plant safety. Notably, the flow patterns observed in a large diameter pipe (approx. 4–6 in or larger) are significantly different from those observed in a medium diameter pipe. In a vertical large diameter pipe, no slug flow is observed due to the instantaneous slug bubble breakup caused by the surface instability. Besides, in a horizontal pipe, flow regime transition from stratification of liquid and gas to slug (plug) flow that induces unsteady flow should be taken into account. From this viewpoint, it is necessary to predict the flow regime in horizontal and vertical large diameter pipes with some elbows and to evaluate the unsteady flow regime. In this study, the simulation method based on the two-fluid model is developed. The two-fluid model is considered the most accurate model because the governing equations for mass, momentum, and energy transfer are formulated for each phase. When using the two-fluid model, some constitutive equations should be given in computing the momentum transfer between gas and liquid phases. In this study, several state-of-art constitutive equations of the bubble diameter, the interfacial drag force and non-drag forces such as the lift force and the bubble-bubble collision force, are implemented in the platform of ANSYS FLUENT. The developed simulation method is validated with visualization results and force from an air-water flow at the elbow of the piping system.

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SAWL 485 for 48” Offshore Application in Thickness up to 41 mm

2008 7th International Pipeline Conference, Volume 3 ◽

10.1115/ipc2008-64520 ◽

2008 ◽

Cited By ~ 1

Author(s):

Volker Schwinn ◽

Alexander Parunov ◽

Ju¨rgen Bauer ◽

Pavel Stepanov

Keyword(s):

Large Diameter ◽

Development Program ◽

Thick Wall ◽

Diameter Pipe ◽

Manufacturing Procedure ◽

Pipeline Project ◽

Qualification Testing ◽

Nord Stream ◽

Large Diameter Pipes ◽

Subsea Pipelines

Vyksa Steel Works (VSW), part of United Metallurgical Company (OMK), has manufactured a trial batch of large diameter pipes for subsea pipelines in accordance with the DNV-OS-F101 standard and the specification of the Nord Stream project. The plates were produced by Dillinger Hu¨tte (DH). The batch included 1,220 mm (48″) diameter pipes of steel grade SAWL 485 (X70) with a wall thickness of 33 mm and 36 mm. All the requirements were met and OMK/VSW became Russia’s and the CIS’s first qualified producer of subsea pipes in accordance with DNV-OS-F101. In order to meet these high-class property requirements for thick wall pipes a successful development program was performed. The development program is outlined and the test results are explained. As a further consequence of the successful qualification work VSW became one of the two suppliers for the world’s largest and first 48″ diameter pipe subsea pipeline project (Nord Stream). Pipes will be supplied for the most sophisticated segment with wall thicknesses of 30.9 mm, 34.6 mm and even 41.0 mm. Results of manufacturing procedure qualification testing (MPQT) and start of production are presented.

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