Granular Media Filter: 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

◙ Max. Diameter The maximum diameter of the column	2.0 m	Positive
◙ Max. Depth The maximum depth of the column	5.0 m	Positive
◙ Max. Volume The maximum volume of the column	50000.0 L	Positive
◙ Diameter The diameter of the column	5.0 m	Positive
◙ Depth The depth of the column	1.0 m	Positive
◙ Aspect Ratio The depth over the diameter ratio	1.0	Positive
● Volume The volume of the column	0.0 L	Positive

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

Sizing

In Design Mode, the user specifies one of the following combinations: Max Diameter and Depth. Max Depth and Diameter, and Max Volume and Aspect Ratio.

In Rating Mode, the user specifies the Number of Units and the Depth and Diameter.

For more information on sizing, see Granular Media Filtration: Modeling Calculations.

Costing

The equipment purchase cost is based on the throughput. By default it is calculated by the program’s built-in model for a granular media filter, and includes the cost of facilities for backwash storage, feed and backwash pumps, piping and building. Material is assumed to be concrete.

For more information on this equipment, see Granular Media Filter.

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