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National Grid Civils Framework

ACS Construction Group > Portfolio > Energy > National Grid Civils Framework

Project Detailsx

Client:National Grid
Duration:4 years (approx)
Value:£1m per year (approx)
Year Completed:2015
Category:Government

Customer Testimonialx

Could you send my thanks to your lads for all the assistance and professionalism during the Unit C excavations. Thanks again

Project Overviewx

ACS were awarded a place on the National Grid Civils framework following a strict technical, safety and commercial process.

Acting as Principal Contractor, over the past 4 years, ACS have carried out over 50 projects on a variety of civils and utility works across Scotland and North of England and have received a number of commendations from National Grid;

“Your teams ability to react to changing and difficult conditions is something they can be proud of and I guess this is something that only comes with the skills, knowledge and experience gained over time.

Once again, thank you to all your staff. May I ask that you share this letter of thanks with all the members of your teams who have been involved with the ILI Feature Excavation Programme.”

For example at the schemes at Bathgate, there were 11 excavations in total within the 3 locations and due to the varying nature of the ground conditions, various shoring techniques and access points needed to be established including the installation of 3.5m deep trench boxes.

For the ILI repairs on their 900mm diameter gas pipeline on the line between Bathgate and Pettinain in Scotland. The works were set in 3 separate remote locations and consisted of a site setup with welfare, car parking and signage. The locations were as diverse as a Scottish Power wind farm, 2 miles within Forestry Commission land and a remote farmer’s field with livestock. Additional to the excavations, a stream had to be diverted as one of the excavations was within the location of the stream. This involved cooperation with both National Grid Environmental and Health & Safety Personnel and the Scotland Environmental Agency. All works were completed without any environmental disruption and a commendation was received to ACS from National Grid Works Managers;

Other typical schemes were to carry out Excavations on their gas feeder pipelines in 17 different locations throughout Scotland. Due to the remote nature of the works there were many different challenges including at one location where a deep excavation was required at the bottom of a stream which was located at the bottom of a steep embankment approximately 800m away from the nearest road. Specialist plant was needed to overcome the logistical challenges to ensure a safe excavation could be completed along with a muck shifting operation to gain safe access to the works.

Once the emergency repair works were complete on the National Grid pipeline then the bed of the stream was re-made using the original bed material and then the Temporary Works were carefully removed. There was then a final Earthworks operation to reinstate the land as it had previously been, before any works commenced on site.

Working on these schemes involves working with multiple stakeholders. For example, ACS liaised with the Scottish Environment Protection Agency to ensure good practice was achieved to isolate a section of the stream using barriers that spanned the width of the stream before using electric submersibles pumps with many environmental benefits including screens attached to prevent fish intake into the pumps and reduced fuel usage.

“I would like to pass on my personal thanks to everyone who has been involved with the successful completion of the 2 No. ILI Feature investigations on Bathgate – Glenmavis Fdr 10. There were many obstacles to overcome:-

The physical locations and civil engineering required to safely access the pipeline. Including the overpumping and diversion of a water course. The effect on SGN, a complicated NRO and background discussions to get the required pressure reduction. Land owner issues and the complicated negotiations to get us ‘legal’ access to the land. It was a fantastic team effort and it just goes to show what can be acheived when everyone pulls in the same direction!”