scholarly journals Lateral Buckling Induced by Trawl Gears Pull-Over Loads on High Temperature/High Pressure Subsea Pipeline

2012 ◽  
Author(s):  
Iswan Herlianto ◽  
Qiang Chen ◽  
Daniel Karunakaran
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Fe Analysis ◽  
Commercial Fishing ◽  
Lateral Buckling ◽  
External Interference ◽  
Global Response ◽  
Subsea Pipeline ◽  
Non Linear ◽  
Temperature And Pressure

Lateral buckling has become a challenge to deep water and high pressure/high temperature (HP/HT) flowlines. In areas that support major commercial fishing industries (e.g. the North Sea in Norway and Atlantic Margin in UK), there is high possibility of interaction between flowlines and fishing trawl gears. This interaction can expose the flowlines to substantial loads and induce lateral buckling. This paper presents global response of subsea pipeline as a result of trawl gear pull-over loads. The external interference from trawl gear pull-over loads can create substantial imperfection or out-of-straightness on the pipeline and may also generate global lateral buckling. The pull-over loads can also induce excessive bending moments and strains in the buckle region. To be able to understand the global response of the pipeline under pull-over loading conditions, a Finite Element (FE) analysis is carried out based on DNV OS F101 [1], DNV RP F110 [2] and DNV RP F111 [3] using general FE analysis software ANSYS v13. Non-linear transient analysis is used to incorporate the non-linear effects, such as the pipeline material nonlinearity, and the response of a structure under the action of pull-over time-dependent loads [8]. The FE analysis covers two periods of duration, i.e. during pull-over duration and post pull-over duration. The analysis during pull-over duration deals with the pipeline global response as a result of trawl gear pull-over loads. The pipeline is subjected to substantial horizontal and vertical pull-over forces from the trawl gear. For post pull-over duration, the FE analysis was carried out for an additional five seconds. In this period, the pull-over loads are no longer applied. However, the pipeline may expand further due to temperature and pressure loads on pipeline. The FE analysis result shows that the pull-over loads induce out-of-straightness on the pipeline and may cause lateral buckling. The pipeline deforms laterally at the pull-over location. The DNV displacement condition code check is used to check the integrity of the pipeline. The pipeline may in the risk under the trawl gears pull-over loads. This paper also shows the development of lateral buckling on the pipeline under different magnitudes of trawl gear pullover loads and lateral soil frictions. Further work should also take into account different dimension of pipeline, as the variation of operating temperature and pressure and variation of lateral and axial soil friction combinations to obtain better conclusions.

Influence of Processing Parameters and Different Content of Tib2 Ceramics on the Properties of Composites Sintered by High Pressure -High Temperature (HP-HT) Method

2014 ◽  
Vol 59 (1) ◽  
pp. 205-209 ◽  
Author(s):  
I. Sulima ◽  
L. Jaworska ◽  
P. Figiel
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Processing Parameters ◽  
Structure Changes ◽  
High Pressure High Temperature ◽  
Mechanical And Physical Properties ◽  
Temperature And Pressure ◽  
Different Content ◽  
Scanning Electron ◽  
Properties Of Composites

Abstract In this paper the properties of the austenitic stainless steel reinforced with various volume fractions of TiB2 ceramics have been studied. The high pressure- high temperature (HP-HT) method of sintering was applied to the formation of composites. Samples were sintered at pressure of 5 and 7 ±0.2 GPa and temperatures of 1273 K and 1573 K. For the tested materials, the relative density, Young’s modulus and hardness were measured. In order to investigate the structure changes, the scanning electron microscope was used. The obtained results show that the temperature and pressure influence on the mechanical and physical properties of the investigated composites.

High Temperature and High Pressure ESP Performance Testing System Design

2013 ◽  
Vol 457-458 ◽  
pp. 423-427
Author(s):  
Xiao Qing Li ◽  
Xiao Yan Liu
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Heat Exchange ◽  
Liquid State ◽  
Constant Pressure ◽  
Hot Water ◽  
Testing System ◽  
Friction Resistance ◽  
High Temperature And Pressure ◽  
Temperature And Pressure

With the development of oilfield exploration, the performance of electric submersible pump (ESP) has been enhanced very fast. It requires testing techniques develop at the same time. The most outstanding question is the testing of high temperature and pressure ESP. A testing well was drilled in Daqing in 1992. It keeps the water liquid state on 150 centigrade by high pressure. This system can simulate operational mode 3000 meters under the ground. But many new ESPs have been produced these years. The quondam testing system couldnt meet the testing requirement. A new testing system is desiderated eagerly. This paper developed a high temperature and pressure ESP testing experimentation system. Hydraulic/thermodynamic analysis calculation has been carried on. Friction resistance from constant pressure point to the suction inlet of hot water pump and the ESP in heating-forced cycle and experimentation primary cycle are calculated respectively. Keeping the water liquid state on 180 centigrade, constant pressure value was fixed on 2.5 MPa. The heat load is calculated including the heat that the water in the system and the equipment need and the heat loss. In order to protect ESP from emanating too much heat to keep the temperature and pressure of the system steady, heat exchange system has been designed. Cold load and heat exchange square have been calculated. Friction resistance and the size of the cold water cistern have been calculated. These provide necessary academic foundation for the testing experimentation of high temperature and pressure ESP.

Upheaval Buckling Analysis of Partially Buried Pipeline Subjected to High Pressure and High Temperature

2011 ◽  
Author(s):  
Jason Sun ◽  
Han Shi ◽  
Paul Jukes
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Soil Cover ◽  
Resistance Force ◽  
Soil Resistance ◽  
Buried Pipeline ◽  
Buried Pipelines ◽  
Lateral Buckling ◽  
Upheaval Buckling ◽  
Global Buckling

Offshore industry is now pushing into the deepwater and starting to face the much higher energy reservoir with high pressure and high temperature. Besides the significant impacts on the material, strength, and reliability of the wellhead, tree, and manifold valve; high Pressure (HP) also leads to thicker pipe wall that increases manufacturing and installation cost. High Temperature (HT) can have much wider impact on operation since the whole subsea system has to be operated over a greater temperature range between the non-producing situations such as installation, and long term shut down, and the maximum production flow. It is more concerned for fact that thicker wall pipe results in much greater thermal load so to make the pipeline strength and tie-in designs more challenging. Burying sections of a HPHT pipeline can provide the advantages of thermal insulation by using the soil cover to retain the cool-down time. Burial can also help to achieve high confidence anchoring and additional resistance to the pipeline axial expansion and walking. Upheaval buckling is a major concern for the buried pipelines because it can generate a high level of strain when happens. Excessive yielding can cause the pipeline to fail prematurely. Partial burial can have less concern although it may complicate the pipeline global buckling behavior and impose challenges on the design and analysis. This paper presents the studies on the upheaval buckling of partially buried pipelines, typical example of an annulus flooded pipe-in-pipe (PIP) configuration. The full-scale FE models were created to simulate the pipeline thermal expansion / upheaval / lateral buckling responses. The pipe-soil interaction (PSI) elements were utilized to model the relationship between the soil resistance (force) and the pipe displacement for the buried sections. The effects of soil cover height, vertical prop size, and soil resistance on the upheaval and lateral buckling response of a partially buried pipeline were investigated. This paper presents the latest techniques, allows an understanding in the global buckling, upheaval or lateral, of partially buried pipeline under the HPHT, and assists the industry to pursue safer but cost effective design.

Raman scattering and photoluminescence investigation of YBO3:Eu3+ under high temperature and high pressure

2015 ◽  
Vol 3 (10) ◽  
pp. 2405-2412 ◽  
Author(s):  
W. S. Song ◽  
G. X. Y. Huang ◽  
R. C. Dai ◽  
Z. P. Wang ◽  
Z. M. Zhang
Keyword(s):  
High Pressure ◽  
Optical Properties ◽  
High Temperature ◽  
Raman Scattering ◽  
Dynamic Method ◽  
Effect Of Temperature ◽  
Temperature And Pressure

The effect of temperature and pressure on structure of YBO3:Eu was characterized by Raman scattering and on optical properties was analyzed by luminescent dynamic method.

scholarly journals Lightning-induced high temperature and pressure microstructures in surface and subsurface fulgurites

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Li-Wei Kuo ◽  
Steven A. F. Smith ◽  
Chien-Chih Chen ◽  
Ching-Shun Ku ◽  
Ching-Yu Chiang ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Reference Sample ◽  
Near Surface ◽  
Landing Point ◽  
High Pressure Metamorphism ◽  
High Temperature And Pressure ◽  
Cloud To Ground Lightning ◽  
Temperature And Pressure ◽  
First Time

AbstractCloud-to-ground lightning causes both high-temperature and high-pressure metamorphism of rocks, forming rock fulgurite. We demonstrate that a range of microstructural features indicative of high temperatures and pressures can form in fulgurites at the surface and in fractures up to several meters below the surface. In comparison to a granite reference sample collected from a borehole at a depth of 138 m, microstructures in both the surface and fracture fulgurite are characterized by: (i) the presence of glass, (ii) a phase transformation in K-feldspar with the presence of exsolution lamellae of plagioclase, and (iii) high residual stresses up to 1.5 GPa. Since this is the first time that fracture-related fulgurite has been described, we also carried out a 1-D numerical model to investigate the processes by which these can form. The model shows that the electric current density in fractures up to 40 m from the landing point can be as high as that on the surface, providing an explanation for the occurrence of fracture-related fulgurites. Our work broadens the near-surface environments in which rock fulgurite has been reported, and provides a detailed description of microstructures that can be compared to those formed during other types of extreme metamorphic events.

Operation of Silicon Carbide Integrated Circuits under High Temperature and Pressure

2017 ◽  
Vol 2017 (1) ◽  
pp. 000526-000530
Author(s):  
M. Barlow ◽  
A. M. Francis ◽  
J. Holmes
Keyword(s):  
Silicon Carbide ◽  
High Pressure ◽  
High Temperature ◽  
Integrated Circuits ◽  
Integrated Circuit ◽  
Leading Edge ◽  
Limited Information ◽  
High Temperature And Pressure ◽  
Temperature And Pressure

Abstract Silicon carbide integrated circuits have demonstrated the ability to function at temperatures as high as 600 °C for extended periods of time. Many environments where high temperature in-situ electronics are desired also have large pressures as well. While some validation has been done for high pressure environments, limited information on the parametric impact of pressure on SiC integrated circuits is available. This paper takes two leading-edge SiC integrated circuit processes using two different classes of devices (JFET and CMOS), and measures the performance through temperature and pressure variation. Circuit functionality was verified at high temperature (475 °C) as well as high pressure (1700 psig).

A New Experimental Evaluation Technology for Foaming Agent in High Temperature and High Pressure Formation

2014 ◽  
Vol 962-965 ◽  
pp. 877-882
Author(s):  
Guang Qiang Cao ◽  
Yun Wang ◽  
Nan Li
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Experimental Evaluation ◽  
Evaluation Method ◽  
Water Production ◽  
Gas Field ◽  
Foaming Agent ◽  
Influence Of Temperature ◽  
Temperature Range ◽  
Temperature And Pressure

Foaming deliquification is one of the most widely used technologies in the development of water production gas field. The key of this technology is the experimental optimization or develop the foaming agent suitable for gas field. With the development of a large number of high temperature and high pressure gas field, foam experimental evaluation methods used at present can not satisfy the temperature range of high temperature and high pressure evaluation requirements, in this case, used the Ross-Miles foam evaluation method as the foundation, built a new experimental evaluation method for foaming agent. Through an example, analyzes the influence of temperature and pressure on the foaming agent performance.

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