Refined Globe Valve Thrust Prediction Model to Bound Midstroke ...
Refined Globe Valve Thrust Prediction Model to Bound Midstroke ...
Refined Globe Valve Thrust Prediction Model to Bound Midstroke ...
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Background – Continued<br />
• EPRI conducted an AOV AOV pilot pilot program program (1996-1999) (1996 1999) teaming with<br />
four utilities <strong>to</strong> develop AOV evaluation methodologies<br />
– EPRI AOV Evaluation Guide TR-107322 TR 107322, , issued May 1999<br />
– Where applicable, EPRI MOV PPM validated methodologies<br />
where used for AOVs<br />
– Several Industry AOV issues identified, including three issues<br />
related <strong>to</strong> globe valves<br />
1) EPRI MOV PPM models were not applicable for flashing (two-<br />
phase) or compressible flow. flow.<br />
<strong>Valve</strong> fac<strong>to</strong>rs as high as 1.6 - 2.35<br />
were found during in-situ in situ plant tests for steam flow application<br />
(INPO OE-11440) OE 11440)<br />
2) No validated models exist for predicting globe valve disc side<br />
loading/friction force<br />
Mid-position position loads may be greater than fully seated loads under<br />
dynamic conditions due <strong>to</strong> flow-induced flow induced forces<br />
3) Mid<br />
Slide #5 #
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