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.
Warnings:
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