Fiber wrapped steel pipes for high-pressure pipelines

2015 ◽  
pp. 121-133
Author(s):  
L. Deaton
Keyword(s):  
High Pressure ◽  
Steel Pipes

Design Optimization of Top-Tensioned Risers for Deepwater HPHT Applications: Part 1

2010 ◽  
Author(s):  
Lixin Xu ◽  
Paul Stanton
Keyword(s):  
High Pressure ◽  
Performance Optimization ◽  
Oil And Gas ◽  
Production Systems ◽  
High Strength ◽  
Environmental Loads ◽  
Steel Pipes ◽  
Design Concepts ◽  
Wide Range ◽  
The Impact

Dry-tree solutions with top-tensioned risers (TTRs) have been successfully used with floating production systems (FPS), such as Spars and TLPs, in a wide range of deepwater applications. Both single-casing and dual-casing top-tensioned risers are field-proven in existing field developments. The top-tensioned risers bring technical advantages and operational cost benefits. However, recent oil and gas developments that have high pressure and high temperature (HPHT) in combination with severe environmental loads push the design limits of conventional steel pipes in deepwater risers. High-strength steel pipes are therefore considered for risers for both technical and economic reasons. This paper discusses the impact of the above requirements on design of top-tensioned risers, and proposes feasible design concepts for top tensioned risers with extremely high pressure requirements. Part I of the topic here addresses strategies of top-tensioned riser sizing and weight management, and design considerations for TTR specialty joints. Part II of this topic will follow for top-tensioned riser tensioning system configuration and tension performance optimization, as well as coupled motion compensation on the host platform. The objective of the study that forms the basis for this paper is to provide top-tensioned riser system configurations that meet the challenges of the extremely high operational pressure and environmental loads in deep and ultra-deep waters.

Calculation of Stresses and Slip in Structural Layers of Unbonded Flexible Pipes

1987 ◽  
Vol 109 (3) ◽  
pp. 263-269 ◽  
Author(s):  
J. J. Fe´ret ◽  
C. L. Bournazel
Keyword(s):  
High Pressure ◽  
Life Expectancy ◽  
Friction And Wear ◽  
Test Results ◽  
Relative Slip ◽  
Steel Pipes ◽  
Flexible Pipes ◽  
Unbonded Flexible Pipes ◽  
Contact Pressures

This paper deals with the behavior of high-pressure unbonded flexible steel pipes which can be used as risers in offshore applications. It concerns primarily the behavior of the internal structure of the pipe. A theoretical approach allows to establish simple formulas for evaluating: the stresses, and the contact pressures between layers due to axisymmetrical loads; the stresses due to bending; the relative slip between layers due to bending. This is a first step towards the evaluation of the life expectancy of flexible pipes. It must be completed by the determination of friction and wear factors through test results.

Evaluation of the Suitability of X100 Steel Pipes for High Pressure Gas Transportation Pipelines by Full Scale Tests

2004 ◽  
Author(s):  
G. Demofonti ◽  
G. Mannucci ◽  
H. G. Hillenbrand ◽  
D. Harris
Keyword(s):  
High Pressure ◽  
Fracture Propagation ◽  
Full Scale ◽  
Gas Pipeline ◽  
Defect Tolerance ◽  
Steel Pipes ◽  
Natural Gas Pipeline ◽  
Safe Level ◽  
Cold Bending ◽  
Full Scale Tests

In order to increase the knowledge necessary for the utilisation of grade X100 steel pipes, and to consolidate preliminary indications regarding the safe level of toughness required to control the ductile fracture propagation event within X100 gas pipeline, an ECSC-Demonstration Project, (DemoPipe), partially sponsored by EPRG, has been performed (2001–2004) using TMCP X100 pipes with a diameter of 36”. The project examines the problems of building a new high grade steel on-shore gas pipeline, with special emphasis given to the issues of the field welding technologies and selection of consumables, girth weld defect tolerance, field cold bending, and the fracture propagation behaviour in a high-pressure natural gas pipeline. In order to achieve these stated aims, a dedicated programme of laboratory and full scale tests was included in the project. This paper presents a summary of some of the results obtained, together with a discussion regarding their applicability to future X100 pipelines.

Investigations into decoating and recycling of pipeline elements using the on-site high-pressure water jet technique

1997 ◽  
Vol 211 (2) ◽  
pp. 129-135 ◽  
Author(s):  
A W Momber
Keyword(s):  
High Pressure ◽  
Water Jet ◽  
Process Parameter ◽  
Steel Pipes ◽  
Water Jets ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Definition Of

The paper describes investigations into the application of the high-pressure water jet technique for the recycling of coated pipeline elements. The paper starts with the introduction and definition of the process parameter 'selectivity'. After this, a review about the general principles of jet cutting technology, including tools, is given. Finally, the author reports on the decoating and demolition of covered steel pipes by plain and abrasive water jets. High-pressure water jets are versatile tools for the complete and partial decoating of steel pipes. Abrasive water jets can be used successfully to cut steel pipes including different coating systems.

Origin and Development of the Stress-Corrosion Defects in Large Diameter Steel Pipes of High-Pressure Gas Pipelines

2014 ◽  
Vol 698 ◽  
pp. 597-602
Author(s):  
Alexey Afanasyev ◽  
Alexey Melnikov ◽  
Maxim Vaskov
Keyword(s):  
High Pressure ◽  
Stress Corrosion ◽  
Stress Corrosion Crack ◽  
High Cycle Fatigue ◽  
Large Diameter ◽  
Compressor Station ◽  
Cycle Fatigue ◽  
Steel Pipes ◽  
Linear Dimensions ◽  
Corrosion Defects

This study presents the results of research of the stress corrosion defects detected at the compressor station gas pipeline. The effect of high-cycle fatigue on the development of such defects was found between the linear dimensions of the stress corrosion crack.

scholarly journals The Properties of High Tensile Strength Steel Pipes, HS2 and HS6, for High Pressure Service

1967 ◽  
Vol 53 (11) ◽  
pp. 1344-1347
Author(s):  
Yoshinori ITO ◽  
Takayasu OKADA ◽  
Susumu TAKEDA ◽  
Kazuo KAWANO ◽  
Hiroshi YUZAWA
Keyword(s):  
High Pressure ◽  
Tensile Strength ◽  
High Tensile Strength ◽  
Steel Pipes

High-pressure freezing of cells in suspension for low-voltage scanning electron microscopy (LVSEM)

1991 ◽  
Vol 49 ◽  
pp. 64-65
Author(s):  
Marek Malecki ◽  
James Pawley ◽  
Hans Ris
Keyword(s):  
Electron Microscopy ◽  
High Pressure ◽  
Low Voltage ◽  
Culture Media ◽  
Cell Structure ◽  
Freeze Substitution ◽  
Ice Crystal ◽  
High Pressure Freezing ◽  
Cell Culture Media ◽  
Voltage Scanning

The ultrastructure of cells suspended in physiological fluids or cell culture media can only be studied if the living processes are stopped while the cells remain in suspension. Attachment of living cells to carrier surfaces to facilitate further processing for electron microscopy produces a rapid reorganization of cell structure eradicating most traces of the structures present when the cells were in suspension. The structure of cells in suspension can be immobilized by either chemical fixation or, much faster, by rapid freezing (cryo-immobilization). The fixation speed is particularly important in studies of cell surface reorganization over time. High pressure freezing provides conditions where specimens up to 500μm thick can be frozen in milliseconds without ice crystal damage. This volume is sufficient for cells to remain in suspension until frozen. However, special procedures are needed to assure that the unattached cells are not lost during subsequent processing for LVSEM or HVEM using freeze-substitution or freeze drying. We recently developed such a procedure.

Prolonged Fixation Studies For Spaceflight

1973 ◽  
Vol 31 ◽  
pp. 332-333
Author(s):  
Robert Corbett ◽  
Delbert E. Philpott ◽  
Sam Black
Keyword(s):  
High Pressure ◽  
Living Systems ◽  
Prolonged Storage ◽  
Time Intervals ◽  
Early Signs ◽  
Large Numbers

Observation of subtle or early signs of change in spaceflight induced alterations on living systems require precise methods of sampling. In-flight analysis would be preferable but constraints of time, equipment, personnel and cost dictate the necessity for prolonged storage before retrieval. Because of this, various tissues have been stored in fixatives and combinations of fixatives and observed at various time intervals. High pressure and the effect of buffer alone have also been tried.Of the various tissues embedded, muscle, cartilage and liver, liver has been the most extensively studied because it contains large numbers of organelles common to all tissues (Fig. 1).

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