GE EVT-Pro 2.0 Operation And Technical Manual page 26

SECTION 19
EVT PRO 2.0
The overall accuracy of in situ testing is based upon the accuracy of the test equipment
used, the accuracy of the gauged inlet pressure, and the accuracy of the effective seat area.
Of the three, effective seat area is the most critical element in determining an accurate set
pressure.
pressure.
SECTION 20
EVT PRO 2.0
The ability to accurately determine PRV set pressure during in situ testing relies on three
known factors: (Refer to figure 20.1)
® Operations and Technical Manual (Rev 1.0 – 2016)
EVT PRO 2.0
® OVERALL SYSTEM ACCURACY
Typically the accuracy of the EVT PRO 2.0
® - THEORY OF OPERATION
• Hydraulic force generated by test equipment
• Inlet pressure resulting from process pressure
• Effective seat area of PRV
Figure 20.1 – Theory of Operation / Force Analysis
®
is within 1% of expected set
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