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SUMMARY:Upheaval behaviour of buried pipelines - Dr ThushyThusyanthan\, Co
 nsultant\, KW Ltd
DTSTART:20081121T163000Z
DTEND:20081121T173000Z
UID:TALK15126@talks.cam.ac.uk
CONTACT:Zelda Stuck
DESCRIPTION:Offshore/onshore oil and gas pipelines are commonly buried in 
 soil to protect the pipeline from external damage (in offshore due to traw
 lers or anchors)\, for better thermal insulation provided by the soil and 
 to prevent the upward bending of the pipeline\, known as upheaval buckling
  (UHB) caused by pipe expansion. In order to avoid upheaval buckling\, the
  pipeline has to be buried deep enough such that the soil cover is suffici
 ently robust to resist the pipe upward movement. Failure to provide suffic
 ient cover soil can lead to upheaval buckling failure of the pipeline. Rep
 air and loss in revenue costs can run into millions of pounds\, not to men
 tion the environmental damage caused by the pipe leak. \n\nThe talk will p
 resent the design methodology used in UHB design and highlight the uncerta
 inties faced by the design engineers when calculating the uplift resistanc
 e of a buried pipeline. Research results over the last two decades have pr
 ovided better understanding and insight into the failure mechanisms associ
 ated with upheaval behaviour of pipelines. However\, the majority of the r
 esults have been from either small scale lab testing or centrifuge testing
 . Hence\, one of the key design parameters\, the mobilisation distance\, h
 as not been fully understood. Gap in knowledge with regard to mobilisation
  distance will be highlighted and results from full scale testing will be 
 compared with centrifuge test results and literature data. \n
LOCATION:Engineering Department - LR6
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