A Warning message in AFT xStream alerts users to issues in the model that will affect the model results. These warnings often offer important information about the converged solution or the model itself, and should always be reviewed before considering the results to be meaningful for the system.

WARNINGS

• Automatic sectioning did not achieve the desired steady conservation error.

• Chempak temperature and/or pressure is out of range for the following

• Control valve open percentage outside valid range

• The difference in velocity exceeds the specified percent

• Energy may not be balanced at Junction X

• FCV could not control flow at Junction X

• Flow may not be balanced at Junction X

• Inlet and outlet pipes at Junction X do not have the same stagnation enthalpy

• Junction X Exceeded End-of-Curve Flow Rate...

• Junction X had reverse flow during the transient

• Maximum system pressure exceeded enthalpy table's maximum pressure of X

• Maximum transient pipe temperature higher than estimate

• Maximum transient pipe temperature significantly lower than estimate

• MOC Steady solution did not reach a nominally steady state before transient

• Negative added pressure by compressor at Junction X

• Physical flow area is less than the sonic area at junction X...

• Pipe/Junction X property calculation exceeded maximum local iteration limit

• Pipe/Junction X property calculation failed to continue towards convergenc

• Pipe X temperature is outside temperature limits in AFT Arrow Steady Solution Control

• Pipe X temperature outside valid temperature range

• PRV could not control pressure at Junction X

• PSV could not control pressure at Junction X

• Temperature is below the saturation line for the following. . .

• Transient choking exists at junction X. The specified flow or pressure could not be met.

• Transient data was extrapolated at Junction X

• Transient temperature was below fluid minimum temperature

• Transient temperature was below saturation temperature

• Unique solution not possible - Relief valve cycles