Engineer's Notebook

Stepless Capacity Control Systems for Reciprocating Compressors

This paper was presented at 9º Fórum de Turbomáquinas Petrobras.

Steve Chaykosky
Manager, Valve Engineering
Joel Sanford
Sr. Project Engineer


This paper introduces two stepless capacity control systems for reciprocating compressors: Dresser-Rand’s Infinite Step Control (ISC) system and Hydraulic Variable Volume Clearance Pocket (HVVCP). Case studies describe the relative advantages of each unloader system and how they increase compressor efficiency and reduce energy costs.

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Tags: Capacity Control Systems, Reciprocating Compressors

other articles from insights issue Spring / Summer 2014