Neutralizer: Equipment Tab

Variable Definitions, Ranges and Default Values

The following table shows the meaning of the variables appearing in this tab, as well as their default values and their generally acceptable range. Note that due to the manner by which the variables are used by the sizing and costing equations, the range of acceptable values may be further reduced.

Variable	Default Value	Range

◙ Volume The total vessel volume.	1,000.0 L	Positive
◙ Max Volume The maximum volume that a unit of this type is available for purchase in the market.	500,000.0 L	Positive
○ Min Allowable Working/Vessel Volume The minimum ratio of working (liquid) volume of material to total vessel volume allowed.	0%	[0,99]
○ Max Allowable Working/Vessel Volume The maximum ratio of working (liquid) volume of material to total vessel volume allowed.	90%	(0,99]
● Height The internal height of the vessel.	0 m	Positive
● Diameter The internal diameter (or diameter equivalent) of the vessel.	0 m	Positive
○ Height/Diameter The ratio of height to diameter (aka aspect ratio) of the vessel.	2.5	Positive
○ Design Pressure The maximum pressure that the vessel has been designed to withstand.	1.52 bar	Positive
○ Equipment Heat Capacity (mCp) The product of total mass times the specific heat capacity of the vessel.	0 kcal/°C	Positive.
○ Is ASME Vessel? ASME standards of vessel construction will increase the cost of the vessel.	Yes	Yes/No

Symbol Key: ○ User-specified value (always input); ● Calculated value (always output); ◙ Sometimes input, sometimes output

Sizing: Design Mode

In design mode, the user specifies the max volume, and the program calculates the number of units (neutralization stages/parallel tank chains) and tank volume based on the volume demand that is specified by the operation carried out as part of the unit procedure hosted by the equipment resource. 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. From the tank volume and the height-diameter aspect ratio, the actual dimensions of each tank (height and diameter) are calculated.

To calculate the demand on tank volume by the operation, the demand on liquid volume by the operation is divided by the operation’s working to vessel volume ratio. 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).

Sizing: Rating Mode

In rating mode, the volume of the tank and the number of units (parallel tank chains) 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 tank volume by the operation carried out as part of the unit procedure(s) hosted by the equipment resource, and if the operation’s tank volume demand of exceeds the actual tank volume, it generates an error.

Costing

The equipment purchase cost is based on the total vessel volume. By default it is calculated by the program’s built-in model for a Neutralizer, with a minimum costing volume of 200 m³.

For more information on this equipment, see Neutralizer and Vertical Vessel: Equipment Tab.

For information on the left-hand side variables and options, see Equipment Data Dialog: Equipment tab.