Liquids Tote

Overview

	Size / Design Variable	Volume
	Costing Variable (Built-in Model)	Volume
	Costing Variable (User-Defined Model)	Volume in m3
	Emissions Port	Yes
	Hosts	Batch Storage in a Tote Procedure   Continuous Storage in a Tote Procedure

A Liquids Tote is used to represent an equipment resource typically used to host a vessel procedure to simulate storage of material. The procedure can be executed in a batch or continuous mode.

Liquids tote: Equipment Tab

The default maximum volume of the tank is 2500.0 L. See Vessel: Equipment Tab for the meaning of the variables appearing on the Equipment Tab.

Sizing: Design Mode

In design mode, the user specifies the max volume, and the program calculates the number of units and volume based on the volume demand that is specified by the operations carried out as part of the (one or more) unit procedures hosted by the equipment resource. Typically, even during the span of a single procedure, more than one operations may demand different volumes. The software will size the vessel based on the largest demand on vessel volume amongst all operations executed in the vessel. If that volume exceeds the maximum volume specification then the software will assume multiple number of identical units, each with a volume that does not exceed the max volume specification, so that the total volume is equal to the demand. From the vessel volume and the height-diameter aspect ratio, the actual dimensions of each vessel (height and diameter) are calculated.

Depending on the unit procedure’s nature (batch vs continuous), the demand on vessel volume by each operation is calculated as follows: If the unit procedure is batch (e.g., Batch Vessel Procedure in a Reactor), then for each operation the demand on liquid volume is divided by the operation’s max allowable working to vessel volume ratio to determine the operation’s demand on vessel volume. In that case, the equipment’s min and max allowable working to vessel volume ratio limits act as constraints on the operation’s min and max allowable working to vessel volume ratio limits (i.e., the operation’s min and max working to vessel volume ratio limits must be within the range defined by the equipment’s min and max working to vessel volume ratio limits). If the unit procedure is continuous (e.g., Continuous Stoichiometric Reaction in a CSTR), then for each operation the demand on liquid volume is divided by the operation’s working to vessel volume ratio to determine the operation’s demand on vessel volume. In that case, the equipment’s min and max allowable working to vessel volume ratio limits act as constraints on the operation’s working to vessel volume ratio (i.e., the operation’s working to vessel volume ratio must be within the range defined by the equipment’s min and max working to vessel volume ratio limits).

For more information on the sizing of a blending tank, see Batch Storage: Modeling Calculations and Continuous Storage: Modeling Calculations.

Sizing: Rating Mode

In rating mode, the volume of the vessel and the number of units are provided by the user. As in the design mode case, the actual dimensions of each vessel (height and diameter) are calculated from the vessel volume and the height-diameter aspect ratio. The program also calculates exactly as in the design mode case the demand on vessel volume by the operations carried out as part of the unit procedure(s) hosted by the equipment resource, and if any operation’s vessel volume demand of exceeds the actual vessel volume, it generates a warning.

Costing

The equipment purchase cost is based on the total tote volume. It is supplied by the built-in model assuming as material of construction SS304.