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Title: Weld trim dimensional tolerances for use with a design factor of 0.8
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: 2131s
Date of Publication: June, 2008
Price: $25.00 US
Authors: Dr Michael Law and John Piper
Abstract: ALLOWABLE WELD trim dimensional tolerances were investigated for use with a 0.8 design factor. The work assumed minimum material properties, and cases were analysed both with finite-element analysis and with an analytical method which is also described. The allowable weld trim in API 5L was found to be adequate for a design factor of 0.72, but failed some cases at a design factor of 0.8. Weld trim tolerances for use with a design factor of 0.8 are derived; these are used in the revised Australian Standard for Gas and Liquid Petroleum Pipelines which now permits the higher design factor.

References

1. J.Kiefner, W.Maxey, R.Eiber, and A.Duffy, 1973. Failure stress levels of flaws in pressurized cylinders. Progress in Flaw Growth and Toughness Testing, ASTM STP 536, American Society for Testing and Materials, pp461-481.
2. M.Law, G.Bowie, and L.Fletcher, 2005. Poisson’s induced axial stresses in restrained pipelines: their effects on yielding and subsequent plasticity. Journal of Pipeline Integrity, 4, 1, pp5-12.
3. AS2885.5-2002 Australian Standard: Pipelines – Gas and liquid petroleum – Field pressure testing.
4. AS2885.1-2007 Australian Standard: Pipelines – Gas and liquid petroleum – Part 1: Design and construction.

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