Gas control unit (GCU) is a complex consisting of process equipment and an automation system.
The main functions of GCU are purification of gas from mechanical particles by filtration, maintaining a set pressure when its flow volume changes to ensure continuity of supply to the consumer, as well as automatically stop gas supply in case of exceeding the permissible pressure.
GCU can be centralized (to serve a group of consumers) and facility-oriented (to serve facilities of one consumer).
GCU design can vary as follows:
- By the output pressure: GCU of low, medium and high output pressure.
- By the number of gas pressure reducing stages: single-stage and multi-stage GCU.
- By the number of reduction lines: single-train and multi-train GCU.
- By the type of gas supply scheme for the gas consumer: dead-end and looped GCU.
- By the presence of a backup reduction train: GCU with and without a backup reduction train.
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