Method: Vary net vapor rate, no make-up gas.
Process: Must always have vapor product.
Advantages: Simple and direct.
Disadvantages: Generally none. Response may be slow when vapor rate is low.
Application: Usually the best choice when vapor rate is always positive.
Variants: Condenser outlet may enter bottom of drum.
Configuration notes: Works best mounting condenser above the drum and allowing gravity flow of condensate to the condensate drum. Exchanger outlet nozzle should allow for free draining of two-phase outlet.
Operation: Controller directly affects column vapor inventory and hence pressure.
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