CSL identified significant compression cost savings by taking gas from the LTS network – as shown in the graph.
It was recognized there was no need to regulate pressure to protect downstream appliances since gas requires further compression. CSL presented the case to the HSE to gain exemption – causing industry rules to change.
A detailed analysis and risk assessment was performed to eliminate the requirement of an ROV.
Since the compressors are capable of processing 2000 kg/h of Bio-CNG to the truck pressure (250 bar), gas is stored in a buffer vessel at 300 bar, to avoid potentially damaging quick stop-starts if Bio-CNG was directly supplied into trucks.
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