CO2 UDCs

Supercritical Carbon Dioxide UDCs

The following tables describe the input and output UDC mappings that the Line Pack driver sets for each pack segment calculation for supercritical CO₂. UDCs are configured on the UDC Map page of the device editor and must be configured for every pack segment. Any UDCs not defined for the optional outputs will not be set and will not generate any warnings.

The UDCs listed with the Last Segment Input: prefix indicate the points that are set for each pack segment and used as inputs to the Line Pack calculation. These points will hold the last good value of the specified input. See Calculation Inputs for more information.

See the following subsections for more information:

Required Input UDCs

The following table describes the point record configurations required for Line Pack. These UDCs must be configured for the facility of every pack sub-segment and for any pack segments that have no pack sub-segments.

Point Description	Description	Point Type	Units
Sub-Segment Status	The status of the pack sub-segment. This value is configurable on the System Settings page.	Enum	N/A
Sub-Segment Volume	The pipe volume of the pack sub-segment.	Analog	MCF
Sub-Segment Length	The pipe length of the pack sub-segment.	Analog	mile
Sub-Segment Diameter	The pipe diameter of the pack sub-segment.	Analog	inch

Point Description

Description

Point Type

Units

Sub-Segment Status

The status of the pack sub-segment. This value is configurable on the System Settings page.

Enum

N/A

Sub-Segment Volume

The pipe volume of the pack sub-segment.

Analog

MCF

Sub-Segment Length

The pipe length of the pack sub-segment.

Analog

mile

Sub-Segment Diameter

The pipe diameter of the pack sub-segment.

Analog

inch

Required Output UDCs

The bulk of the UDCs in the following table are used for writing out the values of inputs used in the Line Pack calculation.

Value	Description	Point Type	Units
Last Segment Input: Inlet Temperature	Indicates the input used in the line pack calculation for the upstream temperature.	Analog	F
Last Segment Input: Outlet Temperature	Indicates the input used in the line pack calculation for the downstream temperature.	Analog	F
Last Segment Input: Temperature (Ordinal)	Indicates the input used in the line pack calculation for the temperature ordinal. See note about ordinalized points.	Analog	F
Last Segment Input: Inlet Press	Indicates the input used in the line pack calculation for the upstream pressure.	Analog	psig
Last Segment Input: Outlet Pressure	Indicates the input used in the line pack calculation for the downstream pressure.	Analog	psig
Last Segment Input: Pressure (Ordinal)	Indicates the input used in the line pack calculation for the pressure ordinal. See note about ordinalized points.	Analog	psig
Last Segment Input: Atmospheric Pressure	Indicates the input used in the line pack calculation for the atmospheric pressure.	Analog	psi
Last Segment Input: Segment Volume	Indicates the input used in the line pack calculation for the segment volume.	Analog	MCF
Last Segment Input: Measured Inlet Density	Indicates the input used in the line pack calculation for measured inlet density. Note: Measured Inlet Density and Measured Outlet Density are averaged together using a simple arithmetic mean to get the measured density pack for the segment.	Analog	lb/ft³
Last Segment Input: Measured Outlet Density	Indicates the input used in the line pack calculation for measured outlet density. Note: Measured Inlet Density and Measured Outlet Density are averaged together using a simple arithmetic mean to get the measured density pack for the segment.	Analog	lb/ft³
All Sub-Segments in Service	Indicates if all sub-segments are in service. Options are NO or YES.	Enum	N/A
Pack: Current	Indicates the current pack density for the segment. Note: This value would be either the average measured density, or the density calculated from the average temperature and average pressure for the segment.	Analog	lb
Pack: Mass Imbalance	Indicates the flow rate at which the pipeline material is lost in terms of mass. Note: Requires that Mass Balance is enabled. See Configuring Mass Balance for more information about how this is calculated.	Analog	lb/S
Last Segment Calc: Total Inlet Flow Mass	Indicates the calculated value for the upstream (inlet) mass flow rate. Note: Requires that Mass Balance is enabled. See Configuring Mass Balance for more information about how this is calculated.	Analog	lb/S
Last Segment Calc: Total Outlet Flow Mass	Indicates the calculated value for the downstream (outlet) mass flow rate. Note: Requires that Mass Balance is enabled. See Configuring Mass Balance for more information about how this is calculated.	Analog	lb/S

Value

Description

Point Type

Units

Last Segment Input: Inlet Temperature

Indicates the input used in the line pack calculation for the upstream temperature.

Analog

Last Segment Input: Outlet Temperature

Indicates the input used in the line pack calculation for the downstream temperature.

Analog

Last Segment Input: Temperature (Ordinal)

Indicates the input used in the line pack calculation for the temperature ordinal. See note about ordinalized points.

Analog

Last Segment Input: Inlet Press

Indicates the input used in the line pack calculation for the upstream pressure.

Analog

psig

Last Segment Input: Outlet Pressure

Indicates the input used in the line pack calculation for the downstream pressure.

Analog

psig

Last Segment Input: Pressure (Ordinal)

Indicates the input used in the line pack calculation for the pressure ordinal. See note about ordinalized points.

Analog

psig

Last Segment Input: Atmospheric Pressure

Indicates the input used in the line pack calculation for the atmospheric pressure.

Analog

psi

Last Segment Input: Segment Volume

Indicates the input used in the line pack calculation for the segment volume.

Analog

MCF

Last Segment Input: Measured Inlet Density

Indicates the input used in the line pack calculation for measured inlet density.

Note: Measured Inlet Density and Measured Outlet Density are averaged together using a simple arithmetic mean to get the measured density pack for the segment.

Analog

lb/ft³

Last Segment Input: Measured Outlet Density

Indicates the input used in the line pack calculation for measured outlet density.

Note: Measured Inlet Density and Measured Outlet Density are averaged together using a simple arithmetic mean to get the measured density pack for the segment.

Analog

lb/ft³

All Sub-Segments in Service

Indicates if all sub-segments are in service. Options are NO or YES.

Enum

N/A

Pack: Current

Indicates the current pack density for the segment.

Note: This value would be either the average measured density, or the density calculated from the average temperature and average pressure for the segment.

Analog

Pack: Mass Imbalance

Indicates the flow rate at which the pipeline material is lost in terms of mass.

Note: Requires that Mass Balance is enabled. See Configuring Mass Balance for more information about how this is calculated.

Analog

lb/S

Last Segment Calc: Total Inlet Flow Mass

Indicates the calculated value for the upstream (inlet) mass flow rate.

Note: Requires that Mass Balance is enabled. See Configuring Mass Balance for more information about how this is calculated.

Analog

lb/S

Last Segment Calc: Total Outlet Flow Mass

Indicates the calculated value for the downstream (outlet) mass flow rate.

Note: Requires that Mass Balance is enabled. See Configuring Mass Balance for more information about how this is calculated.

Analog

lb/S

Optional Output UDCs

Optional output values will not be calculated if the UDC is not configured (and no warning will be generated).

Value	Description	Point Type	Units
Last Segment Calc: Avg Temp	Indicates the calculated intermediate value for average temperature.	Analog	R
Last Segment Calc: Avg Pressure	Indicates the calculated intermediate value for average pressure.	Analog	psia
Last Segment Calc: Density	Indicates the calculated intermediate value for density. Note: This is the same value as Pack: Current.	Analog	lb/ft³
Last Segment Calc: MAOP Density	Indicates the calculated intermediate value for maximum allowed operating pressure (MAOP) density. Note: This is the same value as MAOP Pack: Current.	Analog	lb/ft³
Last Segment Calc: Total Inlet Flow Volume	Indicates the calculated value for the upstream (inlet) volume flow rate. Note: Optional if Mass Balance is enabled.	Analog	CFS
Last Segment Calc: Total Outlet Flow Volume	Indicates the calculated value for the downstream (outlet) volume flow rate. Note: Optional if Mass Balance is enabled.	Analog	CFS
Last Segment Calc: Calculated Average Density	Indicates the calculated intermediate value for density at pipeline segment average conditions. Note: Optional if Mass Balance is enabled. Note: This value can be selected as the segment average density when calculating Volume flow rate for Volume Imbalance or Volume Balance.	Analog	lb/ft³
Last Segment Input: MAOP	Indicates the input used in the line pack calculation for the maximum allowed operating pressure (MAOP).	Analog	psig
Pack: Last Hour	Indicates the pack density for the last hour.	Analog	lb
Pack: Last Day	Indicates the pack density for the last day.	Analog	lb
Pack: Last Month	Indicates the pack density for the last month.	Analog	lb
Pack: Delta Last Hour *	Indicates the change in pack density for the last hour. Note: Requires UDC Pack: Delta Current Hour to be configured.	Analog	lb
Pack: Delta Last Day *	Indicates the change in pack density for the last day. Note: Requires UDC Pack: Delta Current Day to be configured.	Analog	lb
Pack: Delta Current Hour *	Indicates the change in pack density for the current hour. Note: Requires UDC Pack: Last Hour to be configured.	Analog	lb
Pack: Delta Current Day *	Indicates the change in pack density for the current day. Note: Requires UDC Pack: Last Day to be configured.	Analog	lb
Pack: Avg Delta Last Hour *	Indicates the change in average pack density since the last hour. Note: Requires UDC Pack: Last Hour to be configured.	Analog	lb
Pack: Minimum Current Month	Indicates the minimum pack density for the current month.	Analog	lb
Pack: Minimum Current Day	Indicates the minimum pack density for the current day.	Analog	lb
Pack: Minimum Current Hour	Indicates the minimum pack density for the current hour.	Analog	lb
Pack: Minimum Last Month *	Indicates the minimum pack density for the last month. Note: Requires UDC Pack: Minimum Current Month to be configured.	Analog	lb
Pack: Minimum Last Day *	Indicates the minimum pack density for the last hour. Note: Requires UDC Pack: Minimum Current Day to be configured.	Analog	lb
Pack: Minimum Last Hour *	Indicates the minimum pack density for the last day. Note: Requires UDC Pack: Minimum Current Hour to be configured.	Analog	lb
Pack: Maximum Current Month	Indicates the maximum pack density for the current month.	Analog	lb
Pack: Maximum Current Day	Indicates the maximum pack density for the current day.	Analog	lb
Pack: Maximum Current Hour	Indicates the maximum pack density for the current hour.	Analog	lb
Pack: Maximum Last Month *	Indicates the maximum pack density for the last month. Note: Requires UDC Pack: Maximum Current Month to be configured.	Analog	lb
Pack: Maximum Last Day *	Indicates the maximum pack density for the last day. Note: Requires UDC Pack: Maximum Current Day to be configured.	Analog	lb
Pack: Maximum Last Hour *	Indicates the maximum pack density for the last hour. Note: Requires UDC Pack: Maximum Current Hour to be configured.	Analog	lb
Pack: Average Current Month	Indicates the average pack density for the current month.	Analog	lb
Pack: Average Current Day	Indicates the average pack density for the current day.	Analog	lb
Pack: Average Current Hour	Indicates the average pack density for the current hour.	Analog	lb
Pack: Average Last Month *	Indicates the average pack density for the last month. Note: Requires UDC Pack: Average Current Month to be configured.	Analog	lb
Pack: Average Last Day *	Indicates the average pack density for the last day. Note: Requires UDC Pack: Average Current Day to be configured.	Analog	lb
Pack: Average Last Hour *	Indicates the average pack density for the last hour. Note: Requires UDC Pack: Average Current Hour to be configured.	Analog	lb
Pack: Mass Balance	Indicates the flow rate at which the pipeline material is gained in terms of mass. This is the negative of Pack: Mass Imbalance. Note: See Configuring Mass Balance for more information about how this is calculated.	Analog	lb/S
Pack: Volume Imbalance	Indicates the flow rate at which the pipeline material is lost in terms of standard volume. Note: See Configuring Mass Balance for more information about how this is calculated.	Analog	CFS
Pack: Volume Balance	Indicates the flow rate at which the pipeline material is gained in terms of standard volume. This is the negative of Pack: Volume Imbalance. Note: See Configuring Mass Balance for more information about how this is calculated.	Analog	CFS
Pack Using Measured Density: Current	Indicates the current measured density pack.	Analog	lb
Pack Using Calculated Density: Current	Indicates the current calculated density pack.	Analog	lb
Pack: Delta Last Calc (Mass)	Indicates the change in line pack mass calculated for a segment as a rate over the time period since the previous line pack mass was calculated. This value is useful when viewed alongside the sum of input rates, output rates, and (im)balance values.	Analog	lb/S
MAOP Pack: Current	Indicates the current pack density at the maximum allowed operating pressure (MAOP).	Analog	lb

Value

Description

Point Type

Units

Last Segment Calc: Avg Temp

Indicates the calculated intermediate value for average temperature.

Analog

Last Segment Calc: Avg Pressure

Indicates the calculated intermediate value for average pressure.

Analog

psia

Last Segment Calc: Density

Indicates the calculated intermediate value for density.

Note: This is the same value as Pack: Current.

Analog

lb/ft³

Last Segment Calc: MAOP Density

Indicates the calculated intermediate value for maximum allowed operating pressure (MAOP) density.

Note: This is the same value as MAOP Pack: Current.

Analog

lb/ft³

Last Segment Calc: Total Inlet Flow Volume

Indicates the calculated value for the upstream (inlet) volume flow rate.

Note: Optional if Mass Balance is enabled.

Analog

CFS

Last Segment Calc: Total Outlet Flow Volume

Indicates the calculated value for the downstream (outlet) volume flow rate.

Note: Optional if Mass Balance is enabled.

Analog

CFS

Last Segment Calc: Calculated Average Density

Indicates the calculated intermediate value for density at pipeline segment average conditions.

Note: Optional if Mass Balance is enabled.

Note: This value can be selected as the segment average density when calculating Volume flow rate for Volume Imbalance or Volume Balance.

Analog

lb/ft³

Last Segment Input: MAOP

Indicates the input used in the line pack calculation for the maximum allowed operating pressure (MAOP).

Analog

psig

Pack: Last Hour

Indicates the pack density for the last hour.

Analog

Pack: Last Day

Indicates the pack density for the last day.

Analog

Pack: Last Month

Indicates the pack density for the last month.

Analog

Pack: Delta Last Hour *

Indicates the change in pack density for the last hour.

Note: Requires UDC Pack: Delta Current Hour to be configured.

Analog

Pack: Delta Last Day *

Indicates the change in pack density for the last day.

Note: Requires UDC Pack: Delta Current Day to be configured.

Analog

Pack: Delta Current Hour *

Indicates the change in pack density for the current hour.

Note: Requires UDC Pack: Last Hour to be configured.

Analog

Pack: Delta Current Day *

Indicates the change in pack density for the current day.

Note: Requires UDC Pack: Last Day to be configured.

Analog

Pack: Avg Delta Last Hour *

Indicates the change in average pack density since the last hour.

Note: Requires UDC Pack: Last Hour to be configured.

Analog

Pack: Minimum Current Month

Indicates the minimum pack density for the current month.

Analog

Pack: Minimum Current Day

Indicates the minimum pack density for the current day.

Analog

Pack: Minimum Current Hour

Indicates the minimum pack density for the current hour.

Analog

Pack: Minimum Last Month *

Indicates the minimum pack density for the last month.

Note: Requires UDC Pack: Minimum Current Month to be configured.

Analog

Pack: Minimum Last Day *

Indicates the minimum pack density for the last hour.

Note: Requires UDC Pack: Minimum Current Day to be configured.

Analog

Pack: Minimum Last Hour *

Indicates the minimum pack density for the last day.

Note: Requires UDC Pack: Minimum Current Hour to be configured.

Analog

Pack: Maximum Current Month

Indicates the maximum pack density for the current month.

Analog

Pack: Maximum Current Day

Indicates the maximum pack density for the current day.

Analog

Pack: Maximum Current Hour

Indicates the maximum pack density for the current hour.

Analog

Pack: Maximum Last Month *

Indicates the maximum pack density for the last month.

Note: Requires UDC Pack: Maximum Current Month to be configured.

Analog

Pack: Maximum Last Day *

Indicates the maximum pack density for the last day.

Note: Requires UDC Pack: Maximum Current Day to be configured.

Analog

Pack: Maximum Last Hour *

Indicates the maximum pack density for the last hour.

Note: Requires UDC Pack: Maximum Current Hour to be configured.

Analog

Pack: Average Current Month

Indicates the average pack density for the current month.

Analog

Pack: Average Current Day

Indicates the average pack density for the current day.

Analog

Pack: Average Current Hour

Indicates the average pack density for the current hour.

Analog

Pack: Average Last Month *

Indicates the average pack density for the last month.

Note: Requires UDC Pack: Average Current Month to be configured.

Analog

Pack: Average Last Day *

Indicates the average pack density for the last day.

Note: Requires UDC Pack: Average Current Day to be configured.

Analog

Pack: Average Last Hour *

Indicates the average pack density for the last hour.

Note: Requires UDC Pack: Average Current Hour to be configured.

Analog

Pack: Mass Balance

Indicates the flow rate at which the pipeline material is gained in terms of mass. This is the negative of Pack: Mass Imbalance.

Note: See Configuring Mass Balance for more information about how this is calculated.

Analog

lb/S

Pack: Volume Imbalance

Indicates the flow rate at which the pipeline material is lost in terms of standard volume.

Note: See Configuring Mass Balance for more information about how this is calculated.

Analog

CFS

Pack: Volume Balance

Indicates the flow rate at which the pipeline material is gained in terms of standard volume. This is the negative of Pack: Volume Imbalance.

Note: See Configuring Mass Balance for more information about how this is calculated.

Analog

CFS

Pack Using Measured Density: Current

Indicates the current measured density pack.

Analog

Pack Using Calculated Density: Current

Indicates the current calculated density pack.

Analog

Pack: Delta Last Calc (Mass)

Indicates the change in line pack mass calculated for a segment as a rate over the time period since the previous line pack mass was calculated. This value is useful when viewed alongside the sum of input rates, output rates, and (im)balance values.

Analog

lb/S

MAOP Pack: Current

Indicates the current pack density at the maximum allowed operating pressure (MAOP).

Analog

* Denotes that the calculation of this UDC is dependent on the configuration of another UDC.