Volume resident over 3 min = 168.9, say, 169 cubic ft.
Height of HLL = 8.6; allow 4 f. from HLL to bottom tray.
Summary of stripper height (all dimensions from bottom tangent)
To bottom tray
12 f. 6 in.
Trayed section
47 f. 6 in.
Top tray to top tangent
4 ft
Total height
64 ft
There will be a 15 f. skirt to give the total height above grade of 79 ft.
This completes the process design of the major items of equipment. These and
the smaller items of equipment are shown in the following preliminary process flow
sheet Fig. 7.
Refinery Gas Treating Processes
529