{"id":20,"date":"2015-11-02T13:35:30","date_gmt":"2015-11-02T13:35:30","guid":{"rendered":"http:\/\/johnbrear-plantintegrity.com\/?page_id=20"},"modified":"2019-01-14T09:53:01","modified_gmt":"2019-01-14T09:53:01","slug":"assessment-of-defects-in-flue-gas-ducts","status":"publish","type":"page","link":"https:\/\/johnbrear-plantintegrity.com\/?page_id=20","title":{"rendered":"Assessment of defects in flue-gas ducts"},"content":{"rendered":"<p><figure id=\"attachment_192\" aria-describedby=\"caption-attachment-192\" style=\"width: 425px\" class=\"wp-caption alignright\"><img fetchpriority=\"high\" decoding=\"async\" src=\"http:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2015\/11\/boiler-cross-section.jpeg\" alt=\"Cross-section of a boiler\" width=\"425\" height=\"500\" class=\"size-full wp-image-192\" \/><figcaption id=\"caption-attachment-192\" class=\"wp-caption-text\">Diagram of once-through boiler with lobster-back flue-gas duct<\/figcaption><\/figure>\r\n<p><em>Technical arbitration panel \u2013 leading the OEM team<\/em><\/p>Issues arose between the OEM and the utility with regard to materials choice and design detail on the \u2018Lobster-back\u2019 section of flue-gas ducts on six 660 MW boilers.  Extensive brittle cracking had occurred in the \u2018Corten\u2019 steel sheeting of the ducts, with a potential for collapse of the lobster-back.<\/p>\r\n<p>The problem was attributed by the operator to poor materials choice, by the manufacturer to periodic cold water ingress from the fire-fighting system.<\/p>\r\n<p>After initial discussions, a technical arbitration panel was convened; this was composed of representatives of both parties and an independent observer.  Mr Brear was asked to lead the OEM team.<\/p>\r\n<p>Agreement was obtained on realistic materials properties, thermal and mechanical loadings, also on failure modes and consequences.  A single fracture path was identified that could lead to collapse and a supplementary support system was proposed to eliminate this risk.<\/p>\r\n<p>Once the optimal technical solution was identified and agreed, litigation was avoided.<\/p>","protected":false},"excerpt":{"rendered":"<p>Technical arbitration panel \u2013 leading the OEM teamIssues arose between the OEM and the utility with regard to materials choice and design detail on the \u2018Lobster-back\u2019 section of flue-gas ducts on six 660 MW boilers. Extensive brittle cracking had occurred in the \u2018Corten\u2019 steel sheeting of the ducts, with a potential for collapse of the &hellip; <a href=\"https:\/\/johnbrear-plantintegrity.com\/?page_id=20\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Assessment of defects in flue-gas ducts<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":114,"menu_order":12,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-20","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/20","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=20"}],"version-history":[{"count":7,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/20\/revisions"}],"predecessor-version":[{"id":561,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/20\/revisions\/561"}],"up":[{"embeddable":true,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/114"}],"wp:attachment":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=20"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}