A Critical Warning message in AFT Arrow alerts users to serious issues in the model results. These messages should always be reviewed by the user, and results containing these messages should never be used for anything other than error resolution.

CRITICAL WARNINGS

• FCV/PRV/PSV Could Not Control Pressure - Pressure Was Added...

• Global energy balance disabled by user in Advanced Parameters panel

• Global mass balance disabled by user in the Advanced Parameters panel        

• Junction X Had Reverse Flow - Compressor/Fan Pressure Could Not Be Predicted

• Junction X uses normal or standard flow units like Y in a flow path with dynamic gas mixing...

• Pipe Sequences of zero friction exist, flow rate cannot be calculated

• Required flow to supply the pressure control valve at junction X is above sonic flow and cannot be supplied.

• Setting relaxation lower than relative pressure/flow tolerance gives unreliable results

• Specified flow out of junction X is above sonic flow and cannot be supplied. Please review results and change your model

• These results do not represent a converged solution. Use only for error resolution purposes