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Colin L Moodie - One of the best experts on this subject based on the ideXlab platform.

  • two sequence pattern matching based flow analysis methods for multi Flowlines layout design
    International Journal of Production Research, 1993
    Co-Authors: Chingen C Lee, Colin L Moodie
    Abstract:

    Abstract In optimizing the layout design of a multi-product assembly environment, the analysis of the material flow is a vital ingredient. In a multi-product production environment, products are usually grouped together into families. Products of the same family group usually involve similar operations; however, it is common to see some difference in the operations and the operational sequences among these products. The design technique for the layout of multi-product Flowlines should be able to resolve the difference among the operation sequence of these products. The ideal material flow in a good layout design should be mostly in-sequence flow. In-sequence flow usually has the benefits of smaller flow distance, easier control of the production process and easier material handling. This paper proposes two flow analysis methods that are designed to provide a better flow analysis for the design of multi-products flowline. The first method adopts the traditional line structure for analysis. The second metho...

Bjørn Melve - One of the best experts on this subject based on the ideXlab platform.

  • Continuous Trawl Protection of Heating Cable for Direct Electric Heating of Flowlines
    24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 3, 2005
    Co-Authors: Ha˚var Ilstad, Svein Harald Sa˚tendal, Atle Harald Børnes, Lars Henning, Bjørn Melve, Torunn Lund Clasen
    Abstract:

    The following paper describes the experimental and analytical work that was carried out in the development of a continuous external trawling protection for the Direct Electrical Heating cables for the subsea Flowlines on the Kristin Field in the North Sea. The developed trawl protection was able to absorb the required 5.0 kJ energy without damage to the cable. The Kristin field is the most extreme HP/HT subsea field developed in Norway to date (170 degC reservoir temperature and 911 barg pressure). This is the first time that a continuous trawl protection is applied to the full length of a flowline. The normal approach would be burying to avoid interaction with fishing activities, however since this is a HP/HT subsea flowline it was necessary with an extra cooling from unburied pipelines to reduce the riser temperatures.Copyright © 2005 by ASME

  • Continuous Trawl Protection of Heating Cable for Direct Electric Heating of Flowlines
    24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 3, 2005
    Co-Authors: Ha˚var Ilstad, Svein Harald Sa˚tendal, Atle Harald Børnes, Lars Henning, Bjørn Melve, Torunn Lund Clasen
    Abstract:

    The following paper describes the experimental and analytical work that was carried out in the development of a continuous external trawling protection for the Direct Electrical Heating cables for the subsea Flowlines on the Kristin Field in the North Sea. The developed trawl protection was able to absorb the required 5.0 kJ energy without damage to the cable. The Kristin field is the most extreme HP/HT subsea field developed in Norway to date (170 degC reservoir temperature and 911 barg pressure). This is the first time that a continuous trawl protection is applied to the full length of a flowline. The normal approach would be burying to avoid interaction with fishing activities, however since this is a HP/HT subsea flowline it was necessary with an extra cooling from unburied pipelines to reduce the riser temperatures.Copyright © 2005 by ASME

  • Design Requirements for High Temperature Flowline Coatings
    21st International Conference on Offshore Mechanics and Arctic Engineering Volume 3, 2002
    Co-Authors: Bjørn Melve
    Abstract:

    It is a challenge to find cost effective insulation systems for subsea Flowlines operating at high internal temperatures. Integrated polymeric insulation coatings are susceptible to degradation by hydrolysis or oxidation. Burial of the flowline accelerates the degradation due to the higher outer surface temperature. In addition does the high temperature modify the mechanical properties of the coating materials. It is recommended to include the temperature history of the field in the design basis. Also it is necessary to perform impact test and shear tests of the coating system at the operational temperature. For buried pipelines it is necessary to calculate the insulating effect of the backfill materials on the surface temperature.Copyright © 2002 by ASME

Torunn Lund Clasen - One of the best experts on this subject based on the ideXlab platform.

  • Continuous Trawl Protection of Heating Cable for Direct Electric Heating of Flowlines
    24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 3, 2005
    Co-Authors: Ha˚var Ilstad, Svein Harald Sa˚tendal, Atle Harald Børnes, Lars Henning, Bjørn Melve, Torunn Lund Clasen
    Abstract:

    The following paper describes the experimental and analytical work that was carried out in the development of a continuous external trawling protection for the Direct Electrical Heating cables for the subsea Flowlines on the Kristin Field in the North Sea. The developed trawl protection was able to absorb the required 5.0 kJ energy without damage to the cable. The Kristin field is the most extreme HP/HT subsea field developed in Norway to date (170 degC reservoir temperature and 911 barg pressure). This is the first time that a continuous trawl protection is applied to the full length of a flowline. The normal approach would be burying to avoid interaction with fishing activities, however since this is a HP/HT subsea flowline it was necessary with an extra cooling from unburied pipelines to reduce the riser temperatures.Copyright © 2005 by ASME

  • Continuous Trawl Protection of Heating Cable for Direct Electric Heating of Flowlines
    24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 3, 2005
    Co-Authors: Ha˚var Ilstad, Svein Harald Sa˚tendal, Atle Harald Børnes, Lars Henning, Bjørn Melve, Torunn Lund Clasen
    Abstract:

    The following paper describes the experimental and analytical work that was carried out in the development of a continuous external trawling protection for the Direct Electrical Heating cables for the subsea Flowlines on the Kristin Field in the North Sea. The developed trawl protection was able to absorb the required 5.0 kJ energy without damage to the cable. The Kristin field is the most extreme HP/HT subsea field developed in Norway to date (170 degC reservoir temperature and 911 barg pressure). This is the first time that a continuous trawl protection is applied to the full length of a flowline. The normal approach would be burying to avoid interaction with fishing activities, however since this is a HP/HT subsea flowline it was necessary with an extra cooling from unburied pipelines to reduce the riser temperatures.Copyright © 2005 by ASME

Chingen C Lee - One of the best experts on this subject based on the ideXlab platform.

  • two sequence pattern matching based flow analysis methods for multi Flowlines layout design
    International Journal of Production Research, 1993
    Co-Authors: Chingen C Lee, Colin L Moodie
    Abstract:

    Abstract In optimizing the layout design of a multi-product assembly environment, the analysis of the material flow is a vital ingredient. In a multi-product production environment, products are usually grouped together into families. Products of the same family group usually involve similar operations; however, it is common to see some difference in the operations and the operational sequences among these products. The design technique for the layout of multi-product Flowlines should be able to resolve the difference among the operation sequence of these products. The ideal material flow in a good layout design should be mostly in-sequence flow. In-sequence flow usually has the benefits of smaller flow distance, easier control of the production process and easier material handling. This paper proposes two flow analysis methods that are designed to provide a better flow analysis for the design of multi-products flowline. The first method adopts the traditional line structure for analysis. The second metho...

Atle Harald Børnes - One of the best experts on this subject based on the ideXlab platform.

  • Continuous Trawl Protection of Heating Cable for Direct Electric Heating of Flowlines
    24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 3, 2005
    Co-Authors: Ha˚var Ilstad, Svein Harald Sa˚tendal, Atle Harald Børnes, Lars Henning, Bjørn Melve, Torunn Lund Clasen
    Abstract:

    The following paper describes the experimental and analytical work that was carried out in the development of a continuous external trawling protection for the Direct Electrical Heating cables for the subsea Flowlines on the Kristin Field in the North Sea. The developed trawl protection was able to absorb the required 5.0 kJ energy without damage to the cable. The Kristin field is the most extreme HP/HT subsea field developed in Norway to date (170 degC reservoir temperature and 911 barg pressure). This is the first time that a continuous trawl protection is applied to the full length of a flowline. The normal approach would be burying to avoid interaction with fishing activities, however since this is a HP/HT subsea flowline it was necessary with an extra cooling from unburied pipelines to reduce the riser temperatures.Copyright © 2005 by ASME

  • Continuous Trawl Protection of Heating Cable for Direct Electric Heating of Flowlines
    24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 3, 2005
    Co-Authors: Ha˚var Ilstad, Svein Harald Sa˚tendal, Atle Harald Børnes, Lars Henning, Bjørn Melve, Torunn Lund Clasen
    Abstract:

    The following paper describes the experimental and analytical work that was carried out in the development of a continuous external trawling protection for the Direct Electrical Heating cables for the subsea Flowlines on the Kristin Field in the North Sea. The developed trawl protection was able to absorb the required 5.0 kJ energy without damage to the cable. The Kristin field is the most extreme HP/HT subsea field developed in Norway to date (170 degC reservoir temperature and 911 barg pressure). This is the first time that a continuous trawl protection is applied to the full length of a flowline. The normal approach would be burying to avoid interaction with fishing activities, however since this is a HP/HT subsea flowline it was necessary with an extra cooling from unburied pipelines to reduce the riser temperatures.Copyright © 2005 by ASME

  • HV cable design applicable for direct electrical heating of very long Flowlines
    Oceans '04 MTS IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600), 2004
    Co-Authors: S. Hvidsten, J.k. Lervik, H. Kullbotten, J.t. Benjaminsen, K. Olafsen, L.m. Lundegaard, Atle Harald Børnes
    Abstract:

    Direct electrical heating (DEH) has shown to be a very promising method to prevent wax and hydrate formation in subsea pipelines used in the North Sea. Up to now the system has been installed on Flowlines of lengths between 5 and 15 km. In this system the heated pipeline is an active conductor in a single-phase electric circuit, together with a single core high voltage extruded cable strapped (piggybacked) to the heated flowline. A specially designed cable with an insulating outer sheath has been proven feasible for lengths up to 15 km. However, for new projects with Flowlines exceeding 40 km a new cable design is essential to limit high voltages subjected to the screen caused by the capacitive and inductive currents. This paper presents electrical and thermal rating of the DEH system for long Flowlines, measurements of mechanical and electrical properties of different semiconductive cable outer sheath materials aged in relevant service conditions, and measurements of electrical resistivity and water content of clay samples taken from relevant oil fields. The results are very promising and show a long endurance of the semiconductive cable sheath materials at the calculated service temperatures. The tests confirm that a sufficient low resistivity of the semiconductive outer sheath and clay for continuously transferring capacitive currents to ground was measured. The results indicate that the DEH system can be used for particular long Flowlines to prevent wax and hydrate formation