Number Of Trays

Most atmospheric towers have 25-35 trays between the flash zone and tower top. The number of trays in various sections of the tower depends on the properties of cuts desired from the crude column, as shown in Table 1-1.

The allowable pressure drop for trays is approximately 0.1-0.2 psi, per tray. Generally, a pressure drop of 5 psi is allowed between

Table 1-1

Number of Trays between Side Draws in Crude Distillation Unit

Table 1-1

Number of Trays between Side Draws in Crude Distillation Unit

SEPARATION

NUMBER OF TRAYS

NAPHTHA-KEROSENE

8-9

KEROSENE-LIGHT DIESEL

9-11

LIGHT DIESEL-ATM RESID

8-11

FLASH ZONE TO FIRST DRAW TRAY

4-5

STEAM STRIPPER SECTION

4-6

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