Column Tray Sizing

Tray sizing criteria are supplied in this window. All trays in the defined section are designed using the same criteria. All data in this window have default values. See Tray Calculations for more details.

Usage

From the Column Tray and Packing Hydraulics Window, define a column section in the table, select Trays as the Internals and select the Sizing option in the Calculation Type drop-down list box. Push the corresponding Enter Data button to enter column tray sizing information for the selected column section.

Tray Type

Select the desired type of tray with the drop-down list box. Choices are:

VALVE : GLITSCH Valve trays

SIEVE : Sieve trays

CAP : Bubble cap trays

Minimum Tray Diameter

You may provide a Minimum Tray Diameter for the design. The default value is 15 inches or 381 millimeters.

Tray Spacing

The default Tray Spacing for the section of trays is 24 inches or 610 millimeters.

Flooding Factor

The Flooding Factor is expressed as a percent of flood. This is a target to not be exceeded in the section. PRO/II predicts the exact tray size to meet this factor and then calculates the next smaller standard tray size and next larger standard tray size. The largest standard size for the section is used to re-rate all trays in the section for the design. Default Flooding Factors are:

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System Loading Factor

Optionally, a System Loading Factor may be supplied to account for foaming on the trays. The default value is 1.0. See System Loading Factors for suggested values based on service.

Number Of Flow Paths

Select the Number Of Flow Paths for the trays from the drop-down list. One, two and four are allowed for tray design.

Perform Tray Sizing Calculations

Select the desired Tray Sizing Calculation Option by clicking on the appropriate radio button. Normally, sizing calculations are performed after completion of all flowsheet calculations. See Sizing at Output or Calculation Time for description of the options.

Click RATEFRAC options … to pop up the Column - RATEFRAC Tray Options dialog box.

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