In-service shear check of heated cased insulated flowlines
Starting friction would be induced and preserved somewhere along the seabed route of cased insulated flowlines(CIF) when the pipe carries service loads.The axial pipe-soil interaction can be divided into three pipe sections:the sliding section,the fixed section and the starting friction section.Alth...
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Published in | Petroleum science Vol. 9; no. 4; pp. 527 - 531 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Beijing
China University of Petroleum (Beijing)
01.12.2012
Offshore Oil/Gas Research Center, China University of Petroleum, Beijing 102249, China%CNOOC Research Institute, Beijing 100027, China |
Subjects | |
Online Access | Get full text |
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Summary: | Starting friction would be induced and preserved somewhere along the seabed route of cased insulated flowlines(CIF) when the pipe carries service loads.The axial pipe-soil interaction can be divided into three pipe sections:the sliding section,the fixed section and the starting friction section.Although limited to a relatively small length of the pipe,the pipe coats of the starting friction section would suffer much higher shear force caused by thermal expansion than those of the sliding section or the fixed section.Based on the axial equilibrium equation of this kind of insulated pipeline,we developed a method for checking the shear force on CIF coats and their interfaces.The typical example shows that starting friction effect should be taken into account when checking the lap shear strength of heatshrinkable sleeves on CIF field joints. |
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Bibliography: | Cased insulated flowlines; starting friction; thermal expansion; shear failure Starting friction would be induced and preserved somewhere along the seabed route of cased insulated flowlines(CIF) when the pipe carries service loads.The axial pipe-soil interaction can be divided into three pipe sections:the sliding section,the fixed section and the starting friction section.Although limited to a relatively small length of the pipe,the pipe coats of the starting friction section would suffer much higher shear force caused by thermal expansion than those of the sliding section or the fixed section.Based on the axial equilibrium equation of this kind of insulated pipeline,we developed a method for checking the shear force on CIF coats and their interfaces.The typical example shows that starting friction effect should be taken into account when checking the lap shear strength of heatshrinkable sleeves on CIF field joints. 11-4995/TE ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1672-5107 1995-8226 |
DOI: | 10.1007/s12182-012-0238-1 |