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
Содержание 353
Страница 12: ...Contents UM353 1B x April 2012 ...
Страница 22: ...Introduction UM353 1B April 2012 1 10 ...
Страница 30: ...Configuration Overview UM353 1B April 2012 2 8 ...
Страница 122: ...Function Blocks UM353 1B April 2012 3 92 ...
Страница 168: ...Data Mapping UM353 1B April 2012 6 28 ...
Страница 204: ...Controller and System Test UM353 1B April 2012 9 8 ...
Страница 222: ...Calibration UM353 1B April 2012 11 4 ...
Страница 226: ...Circuit Description UM353 1B April 2012 12 4 ...
Страница 238: ...Model Designation and Specifications UM353 1B April 2012 13 12 EC Declaration of Conformity ...
Страница 239: ...UM353 1B Model Designation and Specifications April 2012 13 13 Annex A to the EC Declaration of Conformity ...
Страница 240: ...Model Designation and Specifications UM353 1B April 2012 13 14 ...
Страница 244: ...Abbreviations And Acronyms UM353 1B 14 4 April 2012 ...