CUE EPCM simulated the TEG dehydration unit for Marathon’s Timber Lake Compressor Station, ensuring pipeline gas meets spec at 155 MMscfd. The design removes water to 6.5 lb/MM, includes BTEX controls, and supports future expansion with efficient, reliable performance.
Project Spotlight: Timber Lake Compressor Station: TEG Dehydration Unit Design and Simulation
CUE EPCM provided process simulation services for the dehydration unit of Marathon Petroleum’s Timber Lake Compressor Station in Claysville, PA. The dehydration unit uses Triethylene Glycol (TEG) to remove water from pipeline gas, ensuring compliance with pipeline gas specifications.
Key design parameters included:
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Feed Rate: 155 MMscfd (Phase 2)
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Inlet Pressure: 1029.8 psig
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Pipeline Gas Specification: 7 lb/MM water content
The TEG unit design employs a contactor tower, flash drum, and reboiler for efficient moisture removal, with TEG solution concentrations of 98% (lean) and 94% (rich). The unit is optimized to meet outlet water content of 6.5 lb/MM at a gas flow rate of 155.1 MMscfd.
The equipment used includes TEG contactor, flash drum, glycol exchangers, stripping column, and BTEX handling systems, all designed to ensure minimal impact on pipeline gas temperature and meet BTEX disposal requirements.
A key recommendation is to include a trim cooler for the lean TEG solution supply to maintain system efficiency.
The simulation results confirm the unit’s performance at both Phase 1 (126 MMscfd) and Phase 2 (155 MMscfd) flow rates, supporting seamless operation for Marathon Petroleum’s Timber Lake Compressor Station.
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