Figure 4

Level control of column base via bottom product throttling, cascade arrangement

128 Column-Base and Reboiler Arrangements

The dynamic response of the proportional-only, averaging level control system may be defined by a first-order time constant:

where th is in minutes

Ab = cross-sectional area, ft2, of the column base or vaporizer separator AHt = level transmitter span, in feet, of process fluid

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