Browsing by Author "Bowie, G"

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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.
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    Neutron residual stress measurements in linepipe
    (Elsevier B. V., 2006-11-15) Law, M; Gnaëpel-Herold, T; Luzin, V; Bowie, G
    Residual stresses in gas pipelines are generated by manufacturing and construction processes and may affect the subsequent pipe integrity. In the present work, the residual stresses in eight samples of linepipe were measured by neutron diffraction. Residual stresses changed with some coating processes. This has special implications in understanding and mitigating stress corrosion cracking, a major safety and economic problem in some gas pipelines. © 2006 Elsevier B.V
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    Pipesafe, engineering critical assessment software for pipe line girth welds
    (New Zealand Welding Committee, 1996-02-04) Moss, CJ; Irrgang, R; Stathers, PA; Barbaro, F; Bowie, G
    The Australian Standard for Pipeline Construction, AS2885 (1995), considers pipeline girth weld defect acceptance using Tier 1 (workmanship standards), Tier 2 (fitness for purpose) and by Engineering Critical Assessment (ECA) as Tier 3. AS2885 makes provision for ECA in clause 22.4 by stating "if approved the acceptable criteria may be determined by using an approved ECA procedure or other approved method". The ‘fitness for purpose‘ approach adopted in AS2885 is related to that originating from the European Pipeline Research Group (EPRG). However, ECA is currently an unwieldy tool and unattractive to those who have only an occasional need to carry out assessment using fracture mechanics. This paper discusses the software PIPESAFE that has been developed to apply ECA defect acceptance methodology to girth welds in pipelines being built in Australia. PIPESAFE is a PC based software package which aims to enable pipeline engineers to assess the significance of flaws and is based on principles embodied in PD6493, 1991 ‘Guidance on Methods for Assessing the Acceptibility of Flaws in Fusion Welded Structures”. The software is currently being trialed in industry and will be commercially available in the near future.