{"id":810,"date":"2019-01-18T00:17:45","date_gmt":"2019-01-18T00:17:45","guid":{"rendered":"http:\/\/johnbrear-plantintegrity.com\/?page_id=810"},"modified":"2019-01-18T00:30:02","modified_gmt":"2019-01-18T00:30:02","slug":"probabilistic-life-assessment-of-gt-vanes","status":"publish","type":"page","link":"https:\/\/johnbrear-plantintegrity.com\/?page_id=810","title":{"rendered":"Probabilistic life assessment of GT vanes"},"content":{"rendered":"<p><strong>Plant:<\/strong><\/p>\r\n<ul>\r\n    <li>Four heavy duty, 6-stage expansion GTs driving compressors at a UK chemical plant; installed in the 1960s with 112,000 hours service on the current set of vanes<\/li>\r\n<\/ul>\r\n<p><strong>Objective:<\/strong><\/p>\r\n<ul>\r\n    <li>To reduce maintenance costs by extending vane life from 100,000 to 130,000h, prior to retirement of the units<\/li>\r\n<\/ul>\r\n<p><strong>Approach:<\/strong><\/p>\r\n<ul>\r\n    <li>Inspection<\/li>\r\n    <li>Flow, thermal and stress analysis<\/li>\r\n    <li>Probabilistic creep life calculation, allowing for local hot-spots<\/li>\r\n<\/ul>\r\n<p><strong>Benefits:<\/strong><\/p>\r\n<ul>\r\n    <li>Inspection revealed no cracking and little degradation or oxidation<\/li>\r\n    <li>One row demonstrated to be of a different material to that specified<\/li>\r\n    <li>Analysis showed life to be limited by creep under flow-induced bending<\/li>\r\n    <li>Risk calculated to increase by a factor of 5 from 112,000 to 130,000 h<\/li>\r\n    <li>Absolute risk level during extended life deemed tolerable by the operator<\/li>\r\n<\/ul>\r\n<figure id=\"attachment_815\" aria-describedby=\"caption-attachment-815\" style=\"width: 1015px\" class=\"wp-caption alignright\"><img fetchpriority=\"high\" decoding=\"async\" src=\"http:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Vanes-graph-1.gif\" alt=\"\" width=\"1015\" height=\"515\" class=\"size-full wp-image-815\" \/><figcaption id=\"caption-attachment-815\" class=\"wp-caption-text\">Predicted failure probability for GT vanes, individually and as a row, under two operating scenarios<\/figcaption><\/figure>\r\n<p><strong>Published:<\/strong><\/p>\r\n<p>Wood, M.I., Lant, R.P.D. and Brear, J.M., \u201cQuantitative Risk Assessment and its Role in Plant Maintenance Decisions\u201d, IMechE Conf \u2018Power Station Maintenance 2000\u2019, St. Catherine\u2019s College, Oxford, September 2000<\/p>","protected":false},"excerpt":{"rendered":"<p>Plant: Four heavy duty, 6-stage expansion GTs driving compressors at a UK chemical plant; installed in the 1960s with 112,000 hours service on the current set of vanes Objective: To reduce maintenance costs by extending vane life from 100,000 to 130,000h, prior to retirement of the units Approach: Inspection Flow, thermal and stress analysis Probabilistic &hellip; <a href=\"https:\/\/johnbrear-plantintegrity.com\/?page_id=810\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Probabilistic life assessment of GT vanes<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":171,"menu_order":7,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-810","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/810","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=810"}],"version-history":[{"count":5,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/810\/revisions"}],"predecessor-version":[{"id":818,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/810\/revisions\/818"}],"up":[{"embeddable":true,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/171"}],"wp:attachment":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=810"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}