KEP ES749 - Page 101

ES749 Flow Computer
97
Verabar Case
( )
)
73.27
()1(4191.18093.1
2
Γ⋅⋅
⋅−−+=
fa
w
v
P
h
Y
β
Where:
β
= The sensor blockage =
D
P
w
⋅
⋅
π
4
π
= 3.14159
D
= Internal pipe diameter in inches.
w
P
= The sensor's probe width in inches.
w
P
= 0.336” for a -05 sensor.
w
P
= 0.614” for a -10 sensor.
w
P
= 1.043” for a -15 sensor.
w
h
= Verabar differential pressure in inches of H
2
O.
fa
P
= Absolute static pressure (high side of the Verabar) in psia.
Γ =
k
= Isentropic exponent for a real gas or steam.
7.3.11
Expansion Factor
Computation for
Square Law
Flowmeters
(Continued)