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When specifying extractions at a facility with constraints, care needs to be taken to ensure that the constraint is correct. Constraints are at plant Outlet, which may not be obvious.
For example, if you have a plant inlet capacity of 300mmcf/day, and extraction of 15% of the raw gas, then the plant throughput would actually be 300/(1-0.15) or approximately 354mmcf/day.
To work around this convention you can either adjust your constraint to 354mmcf/day at the plant, or create a facility node feeding into the plant (call it say plant inlet) and put a constraint of 300mmcf/day on this facility. See the example below for more information.
In the following example, we want a constraint of 300mmcf/day at the plant. The first example shows that the flow is too high when it is placed at the plant.
In the second example, we have created a new facility (Train 2 Inlet) and put our plant constraint there. The plant outlet has been reduced to 354mmcf/day which is correct.
