Method: Various.
Process: Net vapor rate positive or zero.
Advantages:
Disadvantages:
Application: Effective choice for systems that require
inert venting.
Variants: Many.
Configuration notes: Can be used with methods that allow
for variable condenser duty. See Figures 13-15, 17-24, and 26
for examples. The flooded drum (Figure 16) is not suitable for
addition to this basic method.
Operation: Direct control of overhead pressure. DP varies
to control condensation temperature in condenser, this varies
condenser LMTD. When pressure rises above high set point on receiver,
the high set point controller opens and gas leaves the system.
Warnings:
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