Process Diagram and Description
The capacity of the Frigg UK Terminal at St Fergus is:
- nominally 35 MMscm/d (through three gas processing trains)
- liquids production of 35 kbpd
Gas processing is by JT valves and/or turbo expander. Liquids handling is by two de-ethaniser trains.
The gas trains are identical and designed for parallel operation. They feature the following operations:
- liquids separation (inlet scrubber)
- gas dehydration
- NGL recovery
- sales gas re-heating
The liquids trains are built for parallel operation, and feature the following operations:
- liquid dehydration
- de-ethanisation
- associated off-gas compression
The pressure and temperature of the process facilities are a function of the operating mode. This can be either high or low liquids production, depending on the prevailing economics.
The following diagram shows one of the three gas processing trains.
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