Work with the Pipeline Monitor (PLM) table

One record in this table is used to represent a Pipeline Monitor (PLM) region. A PLM region is a pipeline system or component of a pipeline system where all volume inputs into the region, all volume outputs from the region, and all volume changes within the region are known. For example, to define a plm record for the region, as shown in the second figure, you would need to include the Gross Standard Volumes (GSVs) from the tanks, GSVs from the three meters, and linepack values from the six pipe segments.

The plm records do not need to be mutually exclusive. You may wish to define PLM regions that overlap, or have large PLM regions that include smaller PLM regions, as illustrated in the figure above.