Up to 50% of the UK’s gas flows initially through the St Fergus Gas Terminal, which compresses it and feeds it into the Gas National Transmission System (NTS). The site features a network of compressors, pressure vessels, pipes and valves that keep the gas at the required operational pressures.

In 2015, the National Grid initiated the St Fergus Asset Health Scheme to assess and overhaul the 40-year-old asset. As part of the Scheme, it was identified that the vent intake steelwork within the compressor cabs was corroded and in need of replacement.