March 2019

Valves, Pumps and Turbomachinery

Understand net gas compressor control logic from a process engineering standpoint

In a refinery or petrochemical plant, certain equipment can create “gray areas” between process engineers and instrument engineers.

Hong, R., Chang, G. S., GS Engineering and Construction

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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