UM353-1B Function Blocks
April 2012
3-11
Z
s
= compressibility at standard conditions
Z
f
= compressibility at flowing conditions at upstream tap - Z
f1
Z
b
= compressibility at base conditions
The specific gravity factor (
G
r
) and the compressibility factors (Z
s
, Z
f
, Z
b
) can be entered manually using HLD
(Hold) function blocks, computed, and then downloaded from a host device, or calculated in the controller using the
AG8 (AGA 8 Compressibility Factors of Natural Gas) function block.
The following are analog outputs of the AGA 3 function block:
Q
b
= volume flow rate at base conditions (SCFH - Standard Cubic Feet per Hour)
C' = composite orifice flow factor [SCFH/√ (psia)(in H2O)]
h
w
P
f
T
f
G
r,
Z
f,s,b
Q
b
AGA 3
Application Diagram
To Next Page
Loading...
Need help?
General
