Project: Security Enabling Works and External Civil Engineering.
Client: ESB Ireland.
Contract Responsibilities: Principal Contractor.
Contract: Client Bespoke Contract.
Contract Value: £18,000.
Programme: September 2018 for 4 weeks.
Gallaway Construction Limited were contracted as Principle Contractor to design, manage and construct enabling works for security provisions and a new pedestrian-accessed car park around an existing high-pressure mains gas facility site. The site is controlled under the remit of National Power. It provides gas supplies to the newly developed Carrington Combined-Cycle Power Plant (CCPP), using natural gas to generate 884MW of electricity.
The CCPP uses gas and a steam turbine together to produce up to 50 per cent more electricity from the same fuel than a traditional simple-cycle plant. The waste heat from the gas turbine is routed to the nearby steam turbine, which generates additional power. Carrington consists of two CCPP KA26-1 units. At operating design conditions, each CCPP unit generates 442.3 MW net output. The station generates enough power to meet the electricity needs of one million homes around the Greater Manchester region.
The site conditions were such that the working areas were sensitive from a security viewpoint. Due to restricted working access, all contractors are vetted, movements monitored, and a high-security presence. In addition, the site consisted of restricted space, particularly around the existing live high-pressure gas pipelines and areas around existing structures.
Gallaway coordinated between the client ESB Energy and National Grid to ensure the scope of the works and location of existing services, sensitive elements of the site and the do’s and don’ts were clearly explained before commencements of any paperwork, let alone live works on site. In addition, Gallaway completed both the Pretender and Construction Phase Health and Safety Plans and issued the RAMS to both National Grid and ESB Group for checking and approvals before inducting all operatives onto the proposed site with the provision of permits to works and highly specific toolbox talks.
After carefully considering the existing asset drawings, the site set out after CAT scanning and planning the works. Works were still completed with hand excavations and the removal of spoil from the compound areas by hand. In addition, excavations under fencing for outcoming CCTV and ducting were completed within the day shift to maintain security provisions.