In a refinery or petrochemical plant, certain equipment can create “gray areas” between process engineers and instrument engineers.
In a refinery or petrochemical plant, certain equipment can create “gray areas” between process engineers and instrument engineers. The two-stage reciprocating compressor control, typical of a naphtha reformer, is one of these. The following article describes the interpretation of that control from the standpoint of a process engineer.
The purpose of this article is to understand four points:
The selection control
The exact meaning of controller action, controller output and control valve fail position
Why a high selector is preferable to a low selector in two-stage reciprocating compressor control
The overall scheme and logic of a two-stage reciprocating compressor control.
What i
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