June 2003


Duplex versus triplex architectures for process control systems

There is no significant availability difference when the impact of field devices is considered

D. PERKINS and A. SHELDON, Compressor Controls Corp., Des Moines, Iowa       Comments? Write: editorial@HydrocarbonProcessing.com For several years, a debate has been underway regarding benefits of duplex systems versus triplex systems, especially for use in process control (nonsafety) systems. Previous attempts at quantifying the differences have generally taken a narrow view by focusing on control and safety systems as stand-alone hardware platforms, often with overly simplified reliability models. T

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