A literature survey of high quality girth welds intended for pipelines risers was carried out and the results are compared with full scale resonance fatigue test data on 6” pipes. The samples were made from 168.3×9.9mm (OD×WT) seamless pipes, each having two welds. Axial misalignments (hi-lo’s) and lack of penetration (LOP) defects were introduced in the test pipes to study the effects on the mean minus 2 stand, deviation design S-N curve that was calculated. Post failure examination of the welds was performed to determine the type and size of defects in the failure initiation area. Fracture mechanics calculations were carried out to determine the effect of defects on fatigue life. The test results were compared with published data on 6” pipes with high quality welds. The scatter in the fatigue test data was reduced when comparisons were based on the local stress at the point of fracture initiation. The implications for design rules of the findings in this work are discussed.
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ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering
June 10–15, 2007
San Diego, California, USA
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
0-7918-4270-3
PROCEEDINGS PAPER
Fatigue Design Data Derived From Full Scale Tests on 6”OD Pipe Girth Welds
Per J. Haagensen,
Per J. Haagensen
NTNU, Trondheim, Norway
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Hans Olav Knagenhjelm,
Hans Olav Knagenhjelm
Norsk Hydro ASA, Oslo, Norway
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Oddvin O̸rjasæter
Oddvin O̸rjasæter
SINTEF, Trondheim, Norway
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Per J. Haagensen
NTNU, Trondheim, Norway
Hans Olav Knagenhjelm
Norsk Hydro ASA, Oslo, Norway
Oddvin O̸rjasæter
SINTEF, Trondheim, Norway
Paper No:
OMAE2007-29608, pp. 225-232; 8 pages
Published Online:
May 20, 2009
Citation
Haagensen, PJ, Knagenhjelm, HO, & O̸rjasæter, O. "Fatigue Design Data Derived From Full Scale Tests on 6”OD Pipe Girth Welds." Proceedings of the ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. Volume 4: Materials Technology; Ocean Engineering. San Diego, California, USA. June 10–15, 2007. pp. 225-232. ASME. https://doi.org/10.1115/OMAE2007-29608
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