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SUPERtrol II 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 H2O.
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)
V-Cone Case
P
k
ΔP / 27.7
0.696
(0.649
1
Y
⋅
β
+
−
=
)
4
Note that
P
∆
and
P
can be in any units as long as they are the same.
NOTE: Y=1 for noncompressible fluids (e.g. water, oil etc.).