Browsing by Author "Fletcher, L"

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    Development of the new Australian girth weld defect acceptance standards
    (Welding Technology Institute of Australia, 1994) Bowie, G; Barbaro, F; Moss, CJ; Fletcher, L
    The Australian pipeline code, in common with other areas of welded fabrication, has undertaken development of girth weld defect acceptance standards based on structural significance of the imperfection in addition to the traditional workmanship standards. The "fitness for purpose" approach adopted for the Australian pipeline code is related to that originating from the European pipeline Research Group (EPRF) which has compiled an extensive database of failure conditions of both real and artificial defects. The present paper reviews the relationship of EPRG guidelines and Standards Australia ME38 Committee, Welding Working Group draft revisions to Australian Standard AS2885,1987 hearinafter referred to as the draft AS2885.2. Attention is also drawn to the mechanical property requirements necessary to ensure girth weld integrity as well as the proposed research sponsored by the Cooperative Research Centre (CRC) to extend the pipe wall thickness range for the Australian pipeline industry.
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    Evolution of an expert system for the engineering critical assessment of pipeline girth welds
    (Welding Technology Institute of Australia, 1994) Moss, CJ; Fletcher, L; Barbaro, F; Bowie, G
    AS2885 considers pipeline girth weld defect acceptance using and Tier Tier 1 (workmanship standards) 2 (fitness for purpose) and by Engineering Critical Assessment (ECA) as Tier 3. However, ECA is currently an unwieldy tool and unattractive to those who have only an occasional need to carry out assessment using fracture mechanics. A road map is described for the development of an ECA defect acceptance methodology. Input parameters to an ECA are also reviewed. The early stages in the evolution of an expert system, which aims to make the ECA route more accessible to the pipeline industry, are described.