Clarifier Tank: 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

◙ Surface Area The total surface area of the tank.	0.0 m²	Positive
◙ Max Surface Area The maximum surface area that a unit of this type is available for purchase in the market.	2500.0 m²or 5000.0 m²	Positive
● Tank Volume The internal height of the vessel.	0.0 L	Positive
◙ Tank Depth The depth of the tank. Could be calculated based on the Detention Time.	3.0 m	Positive
○ Tank Area The area of the tank depends on the shape of tank	Circular	Circular/ Rectangular
○ Length/Width The length over the width ratio if the tank is rectangular.	4.0	Positive
● Length The length of a rectangular tank.	0.0 m	Positive
● Width The width of a rectangular tank.	0.0 m	Positive
● Diameter The diameter of a circular tank.	0.0 m	Positive

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

Sizing: Design Mode

In Calculate (Design Mode), the user specifies the Maximum Surface Area and the system computes the Number of Units and the Surface Area. In Design Mode, the Tank Depth is either specified or calculated based on the detention time. In Rating Mode, the tank depth is always specified. For more information on sizing of a clarifier tank, see Clarification: Modeling Calculations.

Sizing: Rating Mode

In User-Defined (Rating Mode), the user specifies the Number of Units and the Surface Area.

Costing

The equipment purchase cost is based on the total surface area, and is calculated by the built in model for a clarifier tank with a minimum surface area of 10 m².

For more information on this equipment, see Clarifier or Thickener.

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