{"id":67051,"date":"2020-05-04T08:19:30","date_gmt":"2020-05-04T12:19:30","guid":{"rendered":"https:\/\/www.mdaturbines.com\/?p=67051"},"modified":"2023-11-16T13:52:43","modified_gmt":"2023-11-16T18:52:43","slug":"steam-turbine-valve-actuator-diagnostics","status":"publish","type":"post","link":"https:\/\/www.mdaturbines.com\/es\/resources\/steam-turbine-valve-actuator-diagnostics\/","title":{"rendered":"Steam Turbine Valve Actuator Diagnostics for Predictive Maintenance"},"content":{"rendered":"<p>MD&amp;A Turbine and Generator Controls Division recently analyzed Steam Turbine Valve Actuator Diagnostics to establish a plan for Predictive Maintenance.\u00a0 Hysteresis Test data was gathered and utilized to establish an in-service predictive maintenance practice.<\/p>\n<p>This practice has allowed the customer to optimize their unit\u2019s operational availability while reducing their maintenance costs. The predictive approach allows savings to be realized by avoiding unnecessary periodic maintenance while assuring component integrity, thereby avoiding episodic maintenance due to in-service failures which often result in forced outages. This service is available for all types of steam turbine servo controlled actuators on fossil-fired, industrial, and combined cycle units.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-67052 size-medium\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/05\/Main-Stop-Valve-225x300.jpg\" alt=\"Main Stop Valve | Steam Turbine Valve Actuator Diagnostics\" width=\"225\" height=\"300\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/05\/Main-Stop-Valve-225x300.jpg 225w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/05\/Main-Stop-Valve-768x1024.jpg 768w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/05\/Main-Stop-Valve-1152x1536.jpg 1152w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/05\/Main-Stop-Valve-1536x2048.jpg 1536w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/05\/Main-Stop-Valve-120x160.jpg 120w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/05\/Main-Stop-Valve-68x90.jpg 68w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/05\/Main-Stop-Valve-scaled.jpg 1800w\" sizes=\"(max-width: 225px) 100vw, 225px\" \/><\/p>\n<p>Currently, no regulatory maintenance practices or intervals have been specified in the United States for non-nuclear steam turbine valves and actuators. Typically, we have seen OEM\u2019s, Non-OEM\u2019s and other industry organizations recommend minimum maintenance intervals for steam turbine valve inspection and repairs every three (3) to five (5) years. Some say these <a href=\"https:\/\/www.mdaturbines.com\/repairs\/steam-turbine\/turbine-valve-actuators\/\">inspections and repairs<\/a> should occur, as a minimum, every 25,000 Effective Operating Hours (EOH).<\/p>\n<p>Adopting a data-driven approach to condition analysis will produce the following beneficial results when compared to strictly periodic maintenance:<\/p>\n<ul>\n<li>Understanding of, and insight into, the asset\u2019s current operating performance<\/li>\n<\/ul>\n<ul>\n<li>Awareness of life expectancy predictions for individual system components<\/li>\n<\/ul>\n<ul>\n<li>The time and confidence to plan and optimize downtime<\/li>\n<\/ul>\n<ul>\n<li>The ability to focus on and manage costly repairs before they are required<\/li>\n<\/ul>\n<p>To further describe the steam turbine valve actuator diagnostics service performed, we started off by recording valve motion data from each of the customer\u2019s Control Valves, Main Stop Valves, and Intercept Valves. Each of these valves had servo modulated position control capabilities and were opened and closed at a rate of 3% per second. Data was gathered for servo coil voltage and demodulated position feedback voltage.<\/p>\n<p>Individual valve hysteresis test results for each valve were then graphed.\u00a0 There were no concerns of mechanical problems with the hydraulic cylinders on the control valves and intercept valves.\u00a0 As shown in the graph for one of the main stop valves below, observations made by MD&amp;A\u2019s controls engineer indicated that the measured servo coil voltage ramp rate showed anomalies. The slope changes indicate the actuator cylinder is either leaking or sticking.<\/p>\n<p>Our recommendations included further investigation of main stop valve 2 within the next year, and the hysteresis test should be performed again to confirm the anomaly is repeatable.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-67053 size-full\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/05\/Main-Stop-Valve-Graph.jpg\" alt=\"Main Stop Valve Graph | Steam Turbine Valve Actuator Diagnostics\" width=\"565\" height=\"424\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/05\/Main-Stop-Valve-Graph.jpg 565w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/05\/Main-Stop-Valve-Graph-300x225.jpg 300w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/05\/Main-Stop-Valve-Graph-213x160.jpg 213w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2020\/05\/Main-Stop-Valve-Graph-90x68.jpg 90w\" sizes=\"(max-width: 565px) 100vw, 565px\" \/><\/p>\n<p>The cost savings associated with this type of predictive analysis can be substantial. Maintenance on a high-pressure positioning actuator typically ranges from $20,000 to $30,000, including removal and re-installation costs. If the actuators on an averaged size turbine are found to be in good condition as a result of the analysis, savings could be well over $200,000.<\/p>\n<p><a href=\"https:\/\/www.mdaturbines.com\/services\/gas-turbine\/control-excitation-field-engineering\/\">MD&amp;A\u2019s Turbine and Generator Controls Division<\/a> maintains a staff of OEM experienced field engineers who provide installation, technical support, advanced troubleshooting, training, and consulting services for gas and steam turbine controls, generator excitation, and auxiliary systems. Call our MD&amp;A Turbine and Generator Controls Division today at +1 (970) 224-2223 or use our <a href=\"https:\/\/www.mdaturbines.com\/contact\/\">Contact form<\/a>.<\/p>\n<p><strong><a href=\"https:\/\/www.mdaturbines.com\/#newsletter\">Sign Up for MD&amp;A\u2019s Insight Newsletter:<\/a> Get quarterly our turbine-generator expert\u2019s case studies and tips!<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>MD&amp;A Turbine and Generator Controls Division recently analyzed Steam Turbine Valve Actuator Diagnostics to establish a plan for Predictive Maintenance.\u00a0 Hysteresis Test data was gathered&#8230;<\/p>\n","protected":false},"author":2,"featured_media":67052,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[8,211],"tags":[164,241,304],"class_list":["post-67051","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-controls","category-parts","tag-main-stop-valve","tag-preventative-maintenance","tag-turbine-and-generator-controls-division"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Steam Turbine Valve Actuator Diagnostics for Predictive Maintenance<\/title>\n<meta name=\"description\" content=\"M&amp;DA Control Systems recently analyzed Steam Turbine Valve Actuator Diagnostics to establish a plan for Predictive Maintenance.\u00a0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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