July 2003

Process Optimization

Glycol dehydration

Proper adjustments will reduce initial investments and operating costs

Eskaros, M., Parsons International Ltd.

Lean glycol concentration must be properly adjusted to achieve low gas dew points for lower glycol circulation rates, even when absorber operating temperatures are high. Significant capital and operating cost savings can be realized by reducing glycol circulation rates while still maintaining the required dew point. A two-train grass roots natural gas liquids (NGL) separation and stabilization plant was built in the Persian Gulf area. During the engineering, procurement and construction (EPC) phase, engineers changed design parameters to achieve lean glycol concentrations more efficiently. Operational adjustments became

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