Tolmount Gas Pipeline

Challenges

Working with Centrica Storage Limited (CSL) live gas handling facility, which harbours gas from pipelines from the North Sea proved challenging from both a logistical perspective and the team getting accustomed to new procedures outside of what they were use to. However - the PM made sure all the team understood what was expected of them through regular briefings and opportunities for the team to spend time with CSL representatives.

Adaptions had to be made to diesel and electric plant which included adding spark arrestors and chalwyn valves.

JGL worked closely with SAIPEM during the mobilisation stage to understand the processes and procedures of the terminal. This collaborative approach formed a good working relationship from the beginning to enable approval of documentation and the issue of various work permits within a week which was very challenging within a live terminal.

Added Value Contributions from JGL

The team made extra efforts to liaise with CSL and their environmental representatives to better understand the procedure and to ensure no delays would be incurred in the terminal. CSL were invited to spend time with the site team to learn about the shaft excavation procedures during the works to help facilitate these new requirements.

Wastewater went through a filtration system prior to discharge. The water was collected within the CSL holding pond prior to discharge. The tunnelling works re-used the water generated within the excavation of the tunnel into 2no Iseki settlement tanks which meant sourcing water from elsewhere was not required.

This water was also used for the grouting of the shaft annulus.