Influence of Process Pressure on Accuracy
During in situ testing, accuracy increases when the difference between process pressure and PRV set
pressure is minimal. However, technicians and plant personnel must realize that the possibility of
putting a PRV into full lift also increases when process pressure is close to PRV set pressure.
Do not
conduct in situ testing when the process pressure is less than 50% or greater than 90% of the PRV
set pressure.
Transducer Accuracy
The transducers provided with the EVT-Pro are calibrated in a dedicated test facility and are delivered
with a certificate of calibration.
The accuracy of the force transducers is higher than 0.1% F.S
. To
maintain this high level of accuracy, GE Energy/Consolidated® requires the EVT-Pro be calibrated on
an annual basis. They are to be returned for calibration per instructions found under the EVT-Pro Tab
on GTC.Net
Overall Accuracy
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.
Typically the
accuracy of the EVT-Pro is within 1% of expected set pressure.
Rev - 1.0 / Page 19 / 10/10/2012
Содержание EVT-Pro
Страница 8: ...AUTHORIZED USE AND RESPONSIBILITIES Rev 1 0 Page 8 10 10 2012...
Страница 12: ...In Situ PRV Testing Technical Description Rev 1 0 Page 12 10 10 2012...
Страница 15: ...Mathematics of In Situ PRV Testing Rev 1 0 Page 15 10 10 2012...
Страница 17: ...Influence of PRV Geometry on Accuracy Rev 1 0 Page 17 10 10 2012...
Страница 20: ...EVT Pro Parts Lists Drawings Bracket Tool Case Load Cell Sensor case Rev 1 0 Page 20 10 10 2012...
Страница 27: ...EVT Pro Software Program Rev 1 0 Page 27 10 10 2012...
Страница 28: ...Power Up Screen Rev 1 0 Page 28 10 10 2012 Click Here to Open the Computer and go to the Desktop...
Страница 55: ...EVT Pro Help Desk Rev 1 0 Page 55 10 10 2012 EVT Pro Help Desk Contact Information EVT Pro Training Information...
Страница 58: ...THE END Rev 1 0 Page 58 10 10 2012...