Main Principles on Analysis and Design of Buried Ballasted Pipelines on Marshes

1996 ◽  
Author(s):  
Leonid A. Dimov ◽  
Valeriy N. Vershinin
Keyword(s):  
Design Analysis ◽  
Soil Deformation ◽  
Gas Pipelines ◽  
Analysis And Design ◽  
General Stability ◽  
State Of Stress ◽  
Lateral Displacements ◽  
Stress And Deformation ◽  
Oil Gas

State of stress and deformation of buried oil-gas pipelines under, operation must meet appointed requirements on strength, deformability, general stability, etc. Fulfilment of those requirements while designing main and field pipelines in conditions of marshes and marshy soils is very problematical. The cause lies both in weak knowledge of peat reaction to longitidual and lateral displacements of the pipe and in impossibility on account of that to analize the pipe state of stress and deformation taking into consideration the joint pipe-soil deformation. Wide research into pipe-peat interaction has been carried out at the Institute of Construction (Republic of Komi, Russia). In the paper there are enumerated main principles on design, analysis and engineering of buried ballasted pipelines on marshes, which have been worked at the Institute. The practical value of the work results for improvement of pipelines reliability under operation is emphasized in the paper, too.

Design analysis and design history

1981 ◽  
Vol 3 (1) ◽  
pp. 23-29
Author(s):  
Pauline Madge
Keyword(s):  
Design Analysis ◽  
Design History ◽  
Analysis And Design

A Model for Oil-Gas Pipelines Cost Prediction Based on a Data Mining Process

2009 ◽  
Author(s):  
Fragiskos A. Batzias ◽  
Phillip-Mark P. Spanidis ◽  
George Maroulis ◽  
Theodore E. Simos
Keyword(s):  
Data Mining ◽  
Gas Pipelines ◽  
Cost Prediction ◽  
Oil Gas

Friction Gages for In-Situ Rock-Mass Deformability and Stress Measurements

1990 ◽  
Vol 112 (1) ◽  
pp. 62-68
Author(s):  
M. G. Karfakis
Keyword(s):  
Rock Mass ◽  
Tangential Stress ◽  
Borehole Wall ◽  
Rock Surface ◽  
Underground Structures ◽  
Stress Strain ◽  
Analysis And Design ◽  
State Of Stress ◽  
Strain Data

The in-situ deformability of rocks and the state-of-stress must be known for the analysis and design of surface and underground structures. This paper presents a method for determining the in-situ deformability of rock-masses using friction gages. Friction gages utilize the friction between the gage and the rock surface for detecting the strain changes. The method involves impressing friction gages on two opposite quadrants of the borehole wall, then radially loading the other two quadrants over 45-deg contact with a self-equilibrating pair of forces of sufficient magnitude to initiate and propagate tensile fractures. While loading, the friction gages detect the tangential strains on the borehole wall before, during and after fracturing of the rock. From the linear portion of the tangential stress-strain data, the elastic properties of the rock can be determined using the appropriate relationships. Furthermore, from the failure and post-failure portions of the tangential stress-strain data the tensile strength of the rock-mass and the in-situ state-of-stress can also be estimated. The theoretical basis of the method, and the fabrication, calibration and testing of the friction gage system, are described. Furthermore, practical field applications of the method are given.

scholarly journals Thermal Analysis Impact for Hydrates Formation in Oil  & Gas Pipelines

2020 ◽  
Vol 1 (1) ◽  
pp. 16-19
Author(s):  
Tommaso De Pippo ◽  
Tatiana Vasco ◽  
António José
Keyword(s):  
Thermal Analysis ◽  
Thermal Conduction ◽  
Piping System ◽  
Gas Pipelines ◽  
Operating Life ◽  
Gas Industry ◽  
Temperature Ranges ◽  
The Impact ◽  
Oil Gas

The  Oil  &  Gas  industry  has  grown  and  new  discoveries  and  technologies  have  risen  in  order  to  accommodate  the  dynamics   of  such  industry.  With  investments  ranging  billions  of  US  Dollars  is  mandatory  to  create  measures  to  avoid  pressure  vs   temperature  related  issues  during  the  extraction,  transportation  and  of  the  crude  in  order  to  minimize  losses  and  maximize   the  profit  (Borsani,  2001).  Hydrates  in  oil&  gas  pipelines  poses  a  very  big  issue  to  the  industry.  Hydrates  are  normally  formed   when  the  adequate  conditions  (gas,  water,  compatible  pressures  and  temperature  ranges)  are  present.  They  are  in  the   market  several  methodologies  to  prevent  the  evolution  or  emerging  of  hydrates.  An  adequate  thermal  study  during  the   design  of  the  pipeline  and  its  insulation  layers,  constitutes  a  greater  value  on  the  path  to  avoid  hydrates  formation  during   the  pipeline  operating  life.  On  This  paper  the  study  is  dedicated  on  the  impact  of  thermal  analysis  in  one  of  the  pipelines   operating  in  one  of  the  Angolans  Offshore  fields.  COSMOS  Geostar  is  the  tool  used  for  the  investigation.  The  study  was   conducted  in  a  pipeline  considering  the  thermal  conduction  through  a  normal  pipe  section  and  the  thermal  conduction   through  a  field  joint.  This  project  has  proven  the  efficiency  of  COSMOS  in  assisting  on  the  determination  of  a  proper  type,   nature  and  size  of  insulation  to  be  applied  in  a  certain  piping  system  for  crude  oil  production  and/or  transport.    

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