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Pipeline Integrity Management Under Geohazard Conditions (PIMG)

By
Mamdouh M. Salama
Mamdouh M. Salama
ConocoPhillips
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Yong-Yi Wang
Yong-Yi Wang
CRES
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Don West
Don West
Golder
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Alexander McKenzie-Johnson
Alexander McKenzie-Johnson
Geosyntec
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Azam B A-Rahman
Azam B A-Rahman
Petronas
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Guiyi Wu
Guiyi Wu
TWI
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Jens Petter Tronskar
Jens Petter Tronskar
DNVGL
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Jim Hart
Jim Hart
SSD Inc
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Bernt J. Leira
Bernt J. Leira
NTNU
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ISBN:
9780791861998
No. of Pages:
412
Publisher:
ASME Press
Publication date:
2020

There have been a number of unexpected girth weld failures in newly constructed pipelines. Girth weld failures have also been observed in pre-service hydrostatic testing. Most of the failures occurred in X70 pipelines with manual welds, although failures have been observed in linepipe grades ranging from X52 to X80. Post-incident investigations indicated that the linepipes, girth weld qualification, and field girth welding and inspection met the requirements in relevant codes and standards. Traditional causes of weld failures such as weld flaws and high-low misalignment played no or insignificant roles. In other words, these failures are beyond expectations based on...

INTRODUCTION
GIRTH WELD FAILURE INCIDENTS
CAUSES OF WELD STRENGTH UNDERMATCHING
CAUSES OF HAZ SOFTENING
MITIGATATION – TECHNICAL SOLUTIONS
MITIGATION – SYSTEMATIC SOLUTIONS
CONCLUDING REMARKS
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