When gas arrives at a storage facility via a pipeline network it first enters a metering station where it is filtered, and the quantity and quality are measured. Injection and withdrawal take place via a number of wells. Where necessary, compressors bring the incoming gas up to the right injection pressure. Since compression raises the temperature, the gas must then be cooled before being conveyed to the wellhead and injected into the natural rock formations. Care must be taken not to exceed the original reservoir pressure. The gas is withdrawn when it is needed, and processed for transportation. It must be dried as it will have absorbed moisture in the reservoir. Once it is on specification it enters the grid and is carried to the consumer.
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