{"id":771,"date":"2019-01-17T20:08:40","date_gmt":"2019-01-17T20:08:40","guid":{"rendered":"http:\/\/johnbrear-plantintegrity.com\/?page_id=771"},"modified":"2019-01-18T00:22:32","modified_gmt":"2019-01-18T00:22:32","slug":"remediation-of-a-vibration-problem","status":"publish","type":"page","link":"https:\/\/johnbrear-plantintegrity.com\/?page_id=771","title":{"rendered":"Remediation of a vibration problem"},"content":{"rendered":"<figure id=\"attachment_773\" aria-describedby=\"caption-attachment-773\" style=\"width: 420px\" class=\"wp-caption alignright\"><img fetchpriority=\"high\" decoding=\"async\" src=\"http:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Accelerometer.jpg\" alt=\"\" width=\"420\" height=\"190\" class=\"size-full wp-image-773\" srcset=\"https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Accelerometer.jpg 841w, https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Accelerometer-300x135.jpg 300w, https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Accelerometer-768x345.jpg 768w\" sizes=\"(max-width: 420px) 100vw, 420px\" \/><figcaption id=\"caption-attachment-773\" class=\"wp-caption-text\">Three-axis accelerometer in place on the bump-stop<\/figcaption><\/figure>\r\n<p><strong>Station:<\/strong><\/p>\r\n<ul>\r\n    <li>A 400MW single-shaft combined-cycle plant, including a 150MW three-pressure HRSG with reheat<\/li>\r\n<\/ul>\r\n<p><strong>Problem:<\/strong><\/p>\r\n<ul>\r\n    <li>Irregular movement of a reheater header at maximum load, with potential for reduced fatigue life of tube-to-header welds<\/li>\r\n<\/ul>\r\n<p><strong>Approach:<\/strong><\/p>\r\n<ul>\r\n    <li>Team approach with the prime contractor, OEM and operator<\/li>\r\n    <li>Design review; plant instrumentation and monitoring<\/li>\r\n    <li>External observation during operation; internal inspection off-load<\/li>\r\n    <li>Investigation of the effect of operational parameters<\/li>\r\n<\/ul>\r\n<p><strong>Benefits:<\/strong><\/p>\r\n<ul>\r\n    <li>Flow induced vibration of tube-bank identified as prime cause, being predicted to generate displacements and frequencies comparable to those observed<\/li>\r\n    <li>Addition of tube spacers implemented, leading to elimination of problem and allowing operation at full power to be resumed<\/li>\r\n    <li>Secondary effect of attemporator performance identified as requiring further investigation<\/li>\r\n<\/ul>\r\n<figure id=\"attachment_776\" aria-describedby=\"caption-attachment-776\" style=\"width: 758px\" class=\"wp-caption alignleft\"><img decoding=\"async\" src=\"http:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/RH-attemp-flow.jpg\" alt=\"\" width=\"758\" height=\"384\" class=\"size-full wp-image-776\" srcset=\"https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/RH-attemp-flow.jpg 758w, https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/RH-attemp-flow-300x152.jpg 300w\" sizes=\"(max-width: 758px) 100vw, 758px\" \/><figcaption id=\"caption-attachment-776\" class=\"wp-caption-text\">Variation in reheater attemporator flow<\/figcaption><\/figure>\r\n<h4><strong>Publication: <\/strong><\/h4>\r\n<p>Brear, J.M. and Jarvis, P.<br \/>\r\n\u201cTracing a vibration problem back to source\u201d<br \/>\r\nETD Int Conf \u2018Heat Recovery Steam Generator Technology\u2019,  Woburn House, London, 10-12 Nov 2003<\/p>","protected":false},"excerpt":{"rendered":"<p>Station: A 400MW single-shaft combined-cycle plant, including a 150MW three-pressure HRSG with reheat Problem: Irregular movement of a reheater header at maximum load, with potential for reduced fatigue life of tube-to-header welds Approach: Team approach with the prime contractor, OEM and operator Design review; plant instrumentation and monitoring External observation during operation; internal inspection off-load &hellip; <a href=\"https:\/\/johnbrear-plantintegrity.com\/?page_id=771\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Remediation of a vibration problem<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":171,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-771","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/771","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=771"}],"version-history":[{"count":7,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/771\/revisions"}],"predecessor-version":[{"id":780,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/771\/revisions\/780"}],"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=771"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}