Function Blocks
AGA3O Function Block
Revision 11 HC900 Hybrid Control Designer Function Block Reference Guide 31
2/07
Properties Group Parameter Index # Parameter Description Value or Selection
Orifice
Material
Orifice material
(Mandatory);
Stainless Steel,
Monel,
Carbon Steel
Select from Drop Down menu
Material
Pipe Material
Pipe material (Mandatory);
Stainless Steel,
Monel,
Carbon Steel
Select from Drop Down menu
Orifice
Temperature at which the
Orifice diameter was
measured. If this is not
specified, use a typical
ambient temperature of
68°F (20°C).
Enter a value
Default = 68°F
Reference
Temperature
Pipe
Temperature at which the
Pipe diameter was
measured. If this is not
specified, use a typical
ambient temperature of
68°F (20°C).
Enter a value
Default = 68°F
Gas Viscosity
Gas Viscosity – Absolute
viscosity of flowing fluid. In
the absence of this
information, use the
recommended default of
0.010268 cP (Refer to
AGA 3 Report- Part 4)
Enter a value
Range 0.005 to 0.5
Default = 0.010268
Transport
Parameters
Isentropic
Exponent
Isentropic Exponent - In the
absence of this information,
use the recommended
default of 1.3 (Refer to AGA
3 Report- Part 4)
Enter a value
Range 1.0 to 2.0
Default = 1.3
Pipe Tap Location Upstream
Downstream
Indicates the position of the
Orifice meter’s pipe
pressure tap.
Note: -
If downstream tap
is chosen, the differential
pressure (HW) must be fed
to the AGA8 block for
correct results.
Select a location of either
upstream, or downstream
Click Radio Button to select
Tap Point Flange
Pipe
Flowing pressure tap point Click Radio Button to select
Units Type U.S
Metric
Type of units for all block
inputs, outputs, and
configuration parameters:
This selection must agree
with the UNITS selection in
the compressiblity block. If
the units do not agree, the
error and status output pins
Click Radio Button to select
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