{"id":614,"date":"2019-01-13T19:25:15","date_gmt":"2019-01-13T19:25:15","guid":{"rendered":"http:\/\/johnbrear-plantintegrity.com\/?page_id=614"},"modified":"2019-01-14T09:53:35","modified_gmt":"2019-01-14T09:53:35","slug":"fibre-optic-temperature-monitoring-of-a-steam-mixer","status":"publish","type":"page","link":"https:\/\/johnbrear-plantintegrity.com\/?page_id=614","title":{"rendered":"Fibre-optic temperature monitoring of a steam mixer"},"content":{"rendered":"<figure id=\"attachment_616\" aria-describedby=\"caption-attachment-616\" style=\"width: 265px\" class=\"wp-caption alignright\"><img fetchpriority=\"high\" decoding=\"async\" src=\"http:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/mixer.jpg\" alt=\"\" width=\"265\" height=\"390\" class=\"size-full wp-image-616\" \/><figcaption id=\"caption-attachment-616\" class=\"wp-caption-text\">Reheat steam mixer<\/figcaption><\/figure>\r\n<p><strong>Component:<\/strong><\/p>\r\n<ul>\r\n    <li>Vertical reheat steam mixer at a Finnish power station<\/li>\r\n<\/ul>\r\n<p><strong>Objective:<\/strong><\/p>\r\n<ul>\r\n    <li>Proving of optical fibre distributed-temperature monitor by field trial<\/li>\r\n    <li>To determine the global temperature distribution around the drain of the mixer, where previous failures have occurred<\/li>\r\n<\/ul>\r\n<p><strong>Issues: <\/strong><\/p>\r\n<ul>\r\n    <li>Extremely small window of opportunity to install equipment<\/li>\r\n    <li>Large mixer mass requires several days to cool to allow access<\/li>\r\n<\/ul>\r\n<p><strong>Approach:<\/strong><\/p>\r\n<ul>\r\n    <li>Optical fibre system and replacement insulation system produced in advance of plant shutdown<\/li>\r\n    <li>Armoured fibre spot-welded using techniques developed beforehand<\/li>\r\n<\/ul>\r\n<p><figure id=\"attachment_619\" aria-describedby=\"caption-attachment-619\" style=\"width: 300px\" class=\"wp-caption alignright\"><img decoding=\"async\" src=\"http:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/mixer-fo.jpg\" alt=\"\" width=\"300\" height=\"200\" class=\"size-full wp-image-619\" \/><figcaption id=\"caption-attachment-619\" class=\"wp-caption-text\">Fibre optic system<\/figcaption><\/figure><br \/>\r\n<strong>Results:<\/strong><\/p>\r\n<ul>\r\n    <li>Installation completed and tested within shutdown timescales<\/li>\r\n    <li>Successful monitoring of start-up and automatic drain operation achieved<\/li>\r\n    <li>Demonstrated that automatic drain operation leads to large temperature variations between top and bottom of the drain<\/li>\r\n    <li>Change in drain procedure shown largely to eliminate this thermal gradient<\/li>\r\n<\/ul>\r\n<p><strong>Benefits:<\/strong><\/p>\r\n<ul>\r\n    <li>Global temperature distribution provided information as to the root cause of the problem<\/li>\r\n    <li>Minor changes to drain procedure eliminated thermal stress and hence fatigue damage<\/li>\r\n    <li>Extremely low cost of residuals left on plant<\/li>\r\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Component: Vertical reheat steam mixer at a Finnish power station Objective: Proving of optical fibre distributed-temperature monitor by field trial To determine the global temperature distribution around the drain of the mixer, where previous failures have occurred Issues: Extremely small window of opportunity to install equipment Large mixer mass requires several days to cool to &hellip; <a href=\"https:\/\/johnbrear-plantintegrity.com\/?page_id=614\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Fibre-optic temperature monitoring of a steam mixer<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":114,"menu_order":7,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-614","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/614","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=614"}],"version-history":[{"count":5,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/614\/revisions"}],"predecessor-version":[{"id":621,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/614\/revisions\/621"}],"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=614"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}