Process: Net vapor rate positive or zero.
Application: Effective choice for systems that require inert venting.
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.
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