A calculated density measurement (in lb/ft³) derived from a lookup table of CO₂ density values based on input temperature and pressure values.

See Line Pack Calculation for more information.

The Line Pack calculation requires several configured inputs.

Inputs to the Line Pack calculation for any segment can be sourced from one of three places:

• Custom calculation rules for any pack segment — configured on the Adjusted inputs section of the Calculations Rules dialog box off the Rules page.
• Base input rules for any pack segment — configured on the Base Inputs dialog box off the Rules page.
• Global Inputs — configured on the Global Inputs page of the device editor.

Depending on changing conditions in the field, it may be appropriate to use different input values for the same calculation. See Configuring Custom Calculation Rules for information about configuring custom rules and setting their precedence order.

The UDC mappings for the required and optional inputs are configured on the UDC Map page of the device editor.

Maximum Allowed Operating Pressure. The maximum allowable pressure the pipeline may safely hold under normal operation conditions. Line Pack at MAOP is an optional calculation for any pipeline content.

See Configuring Calculation Settings for more information.

A density measurement (in lb/ft³) derived from a CO₂ density sensor in the pipeline.

See Line Pack Calculation for more information.

A pack segment facility describes the shortest amount of pipe between sensors with telemetry. A pack segment may contain any number of pack sub-segments. The Line Pack driver uses facility types and hierarchy relationships to determine the segment and sub-segment hierarchies.

See Facility settings for more information.

Pack sub-segment facilities are used to further break down pack segments so that the volume of any individual section of pipe can be specified and so that individual sections can be taken offline as necessary. Pack sub-segments would typically span between two valves.

See Facility settings for more information.

Supercompressibility calculations take into account how different natural gas compositions compress. These differences can be applied to corrected volumes using the selected supercompressibility factor. The Line Pack natural gas calculations use:

• AGA 8 - Gross Method 2
• NX 19 - Legacy
• NX 19

See Supercompressibility Factor for more information.