Check valve analysis and prioritization (CVAP) methodology and wear prediction
Dr Gurudutt Sahni - Leader Valves LTD (PB) - INDIA - [-]
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  • Tesi completa: 44 pagine
  • Abstract
    This thesis emphasizes on plant reliability and safety hinges on the proper functioning of several check valves. Over the Past decade, the Nuclear Industry Check Valve Group (NIC), industry organizations, non-Intrusive diagnostic equipment vendors and engineering consulting firms have proactively developed solutions to address generic problems that result in unplanned maintenance and avoidable plant unavailability. Several utilities have performed reevaluations of safety- and reliability-significant check valve installations, and have instituted programs that employ a combination of testing, inspection, and maintenance to improve plant reliability. There is a wide variance in tools and techniques used to address check valve reliability. These tools range from those based principally on qualitative information to others that apply a combination of qualitative and quantitative methods to assess valve condition.
    The Project describes the need for and benefits of applying quantitative wear and fatigue predictions to screen and prioritize safety-related, economically significant, and/or production- critical, “mega-watt robber” check valves. This technique has been used successfully at several U.S. nuclear units to identify misapplied check valves and to prioritize inspection and maintenance activities based on each valve’s propensity for accelerated internal wear. The population of valves recommended for inspection and/or modification can be reduced, allowing effort to be focused on those valves that are more likely to degrade prematurely. This Check Valve Analysis and Prioritization (CVAP) methodology results in an analytical framework for check valve condition monitoring and condition based maintenance. The methodology can provide a benefit to check valve applications regardless of whether they fall under the IST, INPO-SOER 86-03, and/or Condition Monitoring programs.

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