Pressure Control

Chapter from the Fractionation Design Guide.

Pressure Control Strategy

Control Method	Description & Application	Recommended Range
Overhead Condenser Duty	Modulate cooling duty to control reflux & pressure	±5 psi band
Product Drawoff	Vary bottom or overhead withdrawal rate	±3 psi band
Vent/Dump	Emergency relief, not for routine control	Safety margin only
Vapor/Liquid Split	Adjust reflux ratio while maintaining feed	Tight control ±2 psi

Control Valve Selection

Location	Valve Type	% Installed
Condenser outlet	Globe, Equal %	60
Bottom drawoff	Ball/Gate	100
Feed inlet	Globe, Linear	80

Source: Fractionation_Design_Guide_v1.xlsx · sheet “Pressure_Control”

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