October 2011

Special Report: Process Control and Information Systems

Process gas chromatography: Avoid the iceberg of hidden expenses

Total cost of ownership can quickly add up for field analytical equipment

Gaura, M., Emerson Process Management

Process gas chromatographs (GCs) are the most common multi-component, online chemical analyzer used in modern hydrocarbon processing industry (HPI) facilities—refineries, petrochemical plants and natural gas sites. GCs are proven and can provide data to control processes, supervise product quality and monitor facility emissions. Historically, GCs were placed in shelters that provided a stable temperature environment and a clean work area for operation and maintenance periods. To ensure optimal performance and reduce sample lag time—the time required for a sample to travel from the sample tap to the GC—the shelters were often located in areas classified as hazardous by indus

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