Function Blocks
UM353-1
March
2003
3-14
3.2.6 AG8 - AGA 8 Compressibility Factors of Natural Gas
AG8
function blocks, which can be used on a one per
loop basis, are available in firmware 1.30 and higher. This
block calculates the compressibility factors of natural gas
in accordance with AGA 8 Report No. 8, July 1994 (AGA
Catalog No. XQ9212). It computes various
compressibility factors and the specific gravity (relative
density) using the detailed characterization method
described in the report. The mole percentage of the gas
components and the base temperature and pressure are
entered in the configuration and the flowing temperature
and pressure are provided as block inputs. Parameter
MOL% SUM provides a read only value that is the total
of all the gas compounds that have been entered. The
AGA8 computation is time consuming and is calculated
over a total of 100 scan cycles so as not to have any
significant effect on the controller cycle time.
Zs (compressibility at standard conditions) is calculated
after a power-up or after a configuration change is made.
Zb and Zf are calculated on a periodic basis with the
actual update time dependent on the number of gas
components and the scan cycle of the controller.
AGA 8
Zs
Output
Zs
AGA 8
AG8
ESN = 000
E
xec.
S
eq.
N
o. ...................... 000 to 250 (000)
Input
Pf
Pf
Input
Tf
Tf
P f
T
U
P
N
I
T
U
P
N
I
H
T
M E
P b
f
T
T b
E
S
E
N
INPUT Tf
...............
loop tag.block tag.output
(
null
)
INPUT Pf
...............
loop tag.block tag.output
(
null
)
b
ase
P
ressure (psia)
................................ Real
(14.73)
b
ase
T
emperature (deg F)
..................... Real
(60.0)
A N
Zf
Output
Zf
Zb
Output
Zb
Gr
Output
Gr
METHANE
% composition
...................
Real
(96.5222)
R
T
N I
E
O G
N
NITROGEN
% composition
..................
Real
(.2595)
C
O
D I
X
C
arbon
DIOX
i
D
e
% composition
.........
Real
(.5956)
T
E
N
H A
E
ETHANE
% composition
......................
Real
(1.8186)
D
O
R
P
N
P A
E
PROPANE
% composition
...................
Real
(.4596)
W
E
A T
R
WATER
% composition
........................
Real
(0.0)
S
Y
H
F
U L
D
HY
drogen
SULF
i
D
e
% composition
....
Real
(0.0)
R
D
H Y
E
O G
N
HYDROGEN
% composition
................
Real
(0.0)
C
O
M
N
X
C
arbon
MONOX
i
D
e
% composition
.....
Real
(0.0)
D
O
X
O
E
Y G
N
OXYGEN
% composition
.....................
Real
(0.0)
U
B
N
T A
E
i-BUTANE
% composition
...................
Real
(.0977)
-
i
U
B
N
T A
E
n-BUTANE
% composition
..................
Real
(.1007)
-
n
N
P
N
T A
E
i-P
e
NTANE
% composition
..................
Real
(.0473)
-
i
N
P
N
T A
E
n-P
e
NTANE
% composition
.................
Real
(.0324)
-
n
E
H
N
X A
E
n-HEXANE
% composition
..................
Real
(.0664)
-
n
P
H
N
T A
E
n-H
e
PTANE
% composition
.................
Real
(0.0)
-
n
C
O
N
T A
E
n-OCTANE
% composition
..................
Real
(0.0)
-
n
O
N
N
N A
E
n-NONANE
% composition
..................
Real
(0.0)
-
n
E
D
N
C A
E
n-DECANE
% composition
..................
Real
(0.0)
-
n
E
H
U
L I
M
HELIUM
% composition
.......................
Real
(0.0)
A
O
R G
N
ARGON
% composition
.......................
Real
(0.0)
S U M
%
M O L
MOL% SUM
(read total % composition)
..........
Real
(100.0)
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Summary of Contents for Moore 353
Page 2: ...S t o c k C h e c k c o m ...
Page 14: ...Contents UM353 1 xii March 2003 S t o c k C h e c k c o m ...
Page 24: ...Introduction UM353 1 March 2003 1 10 S t o c k C h e c k c o m ...
Page 152: ...LonWorks Communications UM353 1 March 2003 5 4 S t o c k C h e c k c o m ...
Page 164: ...Network Communications UM353 1 6 12 March 2003 S t o c k C h e c k c o m ...
Page 246: ...Operation UM353 1 March 2003 9 8 S t o c k C h e c k c o m ...
Page 254: ...Controller and System Test UM353 1 March 2003 10 8 S t o c k C h e c k c o m ...
Page 282: ...Circuit Description UM353 1 March 2003 13 4 S t o c k C h e c k c o m ...
Page 298: ...Model Designation and Specifications UM353 1 March 2003 14 16 S t o c k C h e c k c o m ...
Page 302: ...Abbreviations And Acronyms UM353 1 15 2 March 2003 S t o c k C h e c k c o m ...
Page 304: ...Warranty UM353 1 W 2 March 2003 S t o c k C h e c k c o m ...