KEP SUPERtrol II, Руководство пользователя

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SUPERtrol II Flow Computer
98
Accelabar Case








Γ ⋅ ⋅
⋅ − =
−
fta
w
coef a a
P
h
Y Y
73 . 27
1
Where:
a
Y = General Accelabar gas expansion factor (dimensionless)
coef a
Y
−
= Accelabar gas expansion factor coefficient (dimensionless)
w
h = Differential pressure (inches H
2
O @ 68°F)
fta
P = Flowing Accelerator Throat Pressure (psia)
= Flowing throat pressure in psig + atmospheric pressure in psi
Γ = Isentropic Exponent for a real gas or steam
Accelabar
Size
coef a
Y
−
3” 0.7432
4”
0.6986
6”
0.6865
8” 0.6407
10” 0.6095
12”
0.5891
7.3.11
Expansion Factor
Computation for
Square Law
Flowmeters
(Continued)
For 1 inch Accelabar Body








 
  

fta
w
a
P
h
Y
73 . 27
5890 . 9824 .
Where:
a
Y
w
h
fta
P
= Accelabar gas expansion factor (dimensionless)
= Differential pressure (inches H
2
O @ 68°F)
= Flowing Pressure in Accelabar Throat (psia)
= Flowing pressure in psig + atmospheric pressure in psi

= Isentropic Exponent for a real gas
Γ
= Isentropic Exponent for a real gas
or steam
For 3 inch to 12 inch Accelabar Body








 
  

fta
w
a
P
h
Y
73 . 27
5890 . 9824 .
Where:
a
Y
w
h
fta
P
= Accelabar gas expansion factor (dimensionless)
= Differential pressure (inches H
2
O @ 68°F)
= Flowing Pressure in Accelabar Throat (psia)
= Flowing pressure in psig + atmospheric pressure in psi

= Isentropic Exponent for a real gas
Γ
= Isentropic Exponent for a real gas
or steam
For 2 inch Accelabar Body








 

 

fta
w
a
P
h
Y
73 . 27
.58 5 0 .9 730







