Template:TCEFlashTank Tab Page

Unit Type: {{{TCE}}}FlashTank - The first tab page in the access window will have this name.

Tag (Long/Short)	Input/ Calc	Description
Tag	Display	This name tag may be modified with the change tag option.
Condition	Display	OK if no errors/warnings, otherwise lists errors/warnings.
ConditionCount	Display	The current number of errors/warnings. If condition is OK, returns 0.
GeneralDescription / GenDesc	Display	This is an automatically generated description for the unit. If the user has entered text in the 'EqpDesc' field on the Info tab (see below), this will be displayed here. If this field is blank, then SysCAD will display the UnitType or SubClass.
Requirements
On	Tickbox	This variable in used to enable flashing in the unit. If this not selected, the material will flow out of the liquor outlet with no change in state, i.e. the unit acts as a pipe.
Mode	Stand Alone (Manual)	The flash tank will not form part of a flash train.
	Flash Train	The flash tank will form part of a Flash Train if appropriate units are connected to it. The OperatingP - Method will be set to Saturated.
OperatingP The user may only set the operating pressure or temperature of the {{{TCE}}} Flash Tank if it is NOT part of a Flash Train.
Method	Atmospheric	This method is only available if 'Stand Alone' Mode is chosen. All flash calculations will be done at Atmospheric Pressure. The atmospheric pressure is calculated by SysCAD based on the user defined elevation (default elevation is at sea level = 101.325 kPa). The elevation can be changed on the Environment tab page of the Plant Model.
	RequiredP	This method is only available if 'Stand Alone' Mode is chosen. All flash calculations will be done at the user specified pressure (and saturated temperature @ P).
	RequiredT	This method is only available if 'Stand Alone' Mode is chosen. All flash calculations will be done at the user specified temperature (and saturated pressure @ T).
	Saturated	The OperatingP - Method will be set to Saturated if 'Flash Train' Mode is chosen. All flash calculations will be done at the saturated pressure.
PressureReqd / P_Reqd	Input	This field is only visible if the RequiredP method is chosen. This is user specified flash pressure.
TemperatureReqd / T_Reqd	Input	This field is only visible if the RequiredT method is chosen. This is user specified flash temperature.
Result	Calc	The actual pressure used for the sum of the feeds which will also be the outlet pressure (unless further model options change the pressure).
MinFlashP	Input	This is only visible when 'Flash Train' Mode is chosen. The Minimum Flash Pressure.
Options
VapStandardSpModel	Tick Box	If ticked then the Standard (default) species model will be used in the vapour exit stream. This selection has no effect on the model operation.
ShowQFeed	Tick Box	QFeed and associated tab pages (e.g. Sp) will become visible if this is enabled. These tabs will show the properties of the combined feed stream to the Unit. These values are BEFORE any flashing calculations or other sub-models occur.
ShowQProd	Tick Box	QProd and associated tab pages (e.g. Sp) will become visible if this is enabled. These tabs will show the properties of the combined product streams from the Unit. These values are after any flashing calculations or other sub-models occur but before the final phase split is made.
Vapour Entrainment
FlashVapToLiquid	Input	This field allows the user to set a proportion of the flash vapour bypassing to the liquid stream. The default is 0%.
OtherGasToLiquid	Input	This field allows the user to set a proportion of any non-condensable gas bypassing to the liquid stream. The default is 0%.
Results
TemperatureIn / Ti	Calc	The flash tank feed temperature.
PressureIn / Pi	Calc	The flash tank feed pressure.
BPE	Calc	The Boiling Point Elevation of the Flash Tank discharge. This is the BPE value that is used for the Flash calculations.
HeatFlow	Calc	Any environmental heat loss will be displayed here.
FlashT	Calc	The calculated temperature at the operating pressure of the Flash Tank.
FlashP	Calc	The calculated operating pressure of the Flash Tank.
VapourMassFlow / VQm	Calc	The mass flow of flashed vapour.
Flash Train Macro Model These extra fields are only visible if the unit is part of a Flash Train.
VapourMassFlow / VQm	Calc	The mass flow of flashed vapour.
PressureReqd / P_Reqd	Calc	The required flash pressure calculated by the Flash Train.
TotalPressChange / TotaldP	Calc	The total pressure change calculated by the Flash Train.
FeedSatP	Calc	The saturation pressure of the feed.
FlashTrain	Display	A unique tag assigned to the flash train by SysCAD. Each unit in the flash train will have the same tag in this block.
FlashTearBlock	Display	Displays the name of the tear block that is part of the Flash Train.
FlashTrainEqp	List	This contains a list of all of the equipment tags in this flash train. the list might be as follows: FT_FT_001 FT_ST2_001
PAdvBase	Input	Additional damping or acceleration for calculated pressure change (DP) for the iteration. DP = DP * PAdvBase when PAdvExtra=0.
PAdvExtra	Input	Additional damping or acceleration for calculated pressure change (DP) for the iteration. DP = DP * (PAdvBase + PAdvExtra*(VQmReqd-VQm)/Max(VQmReqd,VQm)).