Life assessment methodologies for high temperature branch pieces

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dc.contributor.authorBendeich, PJen_AU
dc.contributor.authorPayten, WMen_AU
dc.date.accessioned2010-09-27T05:48:08Zen_AU
dc.date.available2010-09-27T05:48:08Zen_AU
dc.date.issued2009-08-27en_AU
dc.date.statistics2009-08-27en_AU
dc.description.abstractBranch pieces in high temperature steam circuits are a common feature of power generating plants both conventional and nuclear. A simple inverse code methodology based on BS1113 [1-3] exists for estimating base rupture life in cylinder to cylinder configurations (branches) under constant pressure and temperature. This does not cover the complex issue of estimating the mixed creep-fatigue effects of cycling which can have a significant influence on damage especially under the current practice of multi-shifting as utilities follow fluctuating energy markets. The current work is primarily aimed at extending the inverse code methodology for base rupture to include cycled loading due to startups and shutdowns. This is achieved under the guidelines of the R5 assessment code by the use of an analytical expression for metastable thermal stresses [4,5] and mapped thermal stress response. System loads are not considered in this work other than by the simple method suggested using the inverse code method. Only 90° non protruding branches are considered in the current work. Examples of 90° branches are examined showing the significance of cyclic loading on a variety of branch configurations. It was observed that base rupture dominates most configurations up to a "cliff edge" in thermal ramp rate followed by rapid accumulation of creep-fatigue damage at higher rates. The results are a useful aid when assessing the optimal operating conditions for individual power stations. © 2009, Australian Institute for Non-Destructive Testing (AINDT)en_AU
dc.identifier.citationBendeich, P., & Payten, W. M. (2009). Life assessment methodologies for high temperature branch pieces. Presentation to the 9th International Conference on Operating Pressure Equipment (OPE9), incorporating the AINDT Biennial Conference - "Operating Pressure Equipment", 26th - 28th August 2009. Holiday Inn: Surfers Paradise, Queensland, Australia. In Non-Destructive Testing - Australia, 47(4), 114-118.en_AU
dc.identifier.conferenceenddate28 August 2009en_AU
dc.identifier.conferencename9th International Conference on Operating Pressure Equipment (OPE9), incorporating the AINDT Biennial Conference - 'Operating Pressure Equipmenten_AU
dc.identifier.conferenceplaceSurfers Paradise, Queensland, Australiaen_AU
dc.identifier.conferencestartdate26 August 2009en_AU
dc.identifier.govdoc2726en_AU
dc.identifier.issn0157-6461en_AU
dc.identifier.issue4en_AU
dc.identifier.journaltitleNon-Destructive Testing - Australiaen_AU
dc.identifier.pagination114-118en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2565en_AU
dc.identifier.volume47en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute for Non-Destructive Testing (AINDT)en_AU
dc.subjectBranching ratioen_AU
dc.subjectThermal stressesen_AU
dc.subjectLife cycle assessmenten_AU
dc.subjectFatigueen_AU
dc.subjectStrain rateen_AU
dc.subjectPower plantsen_AU
dc.titleLife assessment methodologies for high temperature branch piecesen_AU
dc.typeConference Presentationen_AU
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