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SECTION 23
EVT PRO 2.0
®
METHODS OF CALCULATING FUNTIONAL SEAT AREA
The
EVT PRO 2.0
®
has three (3) methods of calculating a
valve’s functional (effective) seat
area (refer to figure 23.1 AND 23.2 below) when the exact manufacture's values are not
known. The
EVT PRO 2.0
®
methods for calculating functional seat area are:
Functional Seat Diameter
– requires manual input of the functional seat diameter.
Inner, Outer Seat Diameter
– requires manual input of the inner, then outer seat diameter.
Finger Print Test (Linear Regression)
– requires testing the PRV at a minimum of three
different inlet pressures. Upon successful completion, the software will calculate the
functional seat area of the PRV and normal testing can continue. Be aware that the use of
this method will require coordination with the plant in order to achieve the 3 different inlet
pressures needed.
Figure 23.1
– Example of Valve Functional (Effective) Seat Area
Figure 23.2
– Example of Valve Functional (Effective) Seat Area
EVT PRO 2.0
®
Operations and Technical Manual (Rev 1.0
– 2016)
NOT FOR COPY OR DISTRIBUTION Page 25