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 |
|
|
||
|
◙ Pipe Diameter |
0.0 cm |
Positive |
|
◙ Max Pipe Diameter |
50.0 cm |
Positive |
|
○ Pipe Length |
15.0 m |
Positive |
|
◙ Rated Throughput |
0.0 kL/h |
Positive |
Symbol Key: ○ User-specified value (always input); ● Calculated value (always output); ◙ Sometimes input, sometimes output
In Calculate (Design Mode), the user specifies the Maximum Pipe Diameter and the system computes the Number of Units and the Pipe Diameter. The pipe cross sectional area (and consequently the pipe diameter) is calculated by dividing the operating throughput (m3/h) by the specific throughput (m3/h-m2). If the calculated pipe diameter exceeds the maximum, the system assumes multiple, identical units operating in parallel with a total cross sectional area equal to the calculated.
In User-Defined (Rating Mode), the user specifies the Number of Units and the Pipe Diameter, and the system calculates the specific throughput. The user always specifies the pipe length and the system always calculates the operating throughput. The bulk density of the conveyed material is used to convert the mass throughput into volumetric throughput.
Equipment purchase cost is based on the pipe diameter, the pipe length and material of construction. It is supplied by the built-in model assuming as material of construction CS.
For more information on this equipment, see Screw Conveyor (Bulk Flow)
For information on the left-hand side variables and options, see Equipment Data Dialog: Equipment tab.