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Pipeline for the Irish Gas Transmission network

Infrastructure

Ballough AGI Bypass

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Our team designed a new 85bar Above Ground Installation (AGI) and associated pipelines to bypass the existing Ballough AGI.  

Designed to reduce the strategic importance of Ballough AGI and allow for a future phase which would establish a two tier (85bar / 70bar) transmission network. The project also involves a number of modifications to the existing Ballough AGI and construction sequencing involving several stopple, gassing and de-gassing operations. 

Our scope included environmental and planning inputs, detailed mechanical, civil, structural, electrical and instrumentation design, supervision of site investigations and the PSDP role.  It also included support to GNI in  procuring materials and contract documents for the construction tender. Key technical challenges include various hot tap / stopple works (750mm and 900mm) and a trenchless crossing of the M1 motorway.

Project name:

Ballough AGI Bypass Project

Client:

Gas Networks Ireland (GNI)

Location:

Fingal, North County Dublin, Ireland

Services provided: 

  • AGI site selection and pipeline route selection
  • Preliminary and Detailed design (Civil, Mechanical, Electrical & Instrumentation, construction sequencing)
  • Assessment of alternative trenchless crossing methods for motorway & 110kV lines crossing
  • Site investigations design and supervision
  • Support to materials procurement process
  • Support to construction procurement process
  • Environmental Impact Assessment Report covering:
    • Ecology (including surveys and reporting) and practical recommendations to limit impacts on local biodiversity
    • Landscape & visual including impact assessment report, generation of photomontages and design
    • Flood risk assessment
    • Appropriate Assessment screening
    • Oils, geology & land use
    • Traffic, air quality & climate, noise & vibration
    • Hydrology & drainage
    • Material and waste management, biodiversity
  • Planning application
  • Draft Construction Environmental Management Plan (CEMP)
  • Support Gas Act application to CRU
  • Support Motorway Act application to TII
  • Engagement with statutory bodies including Fingal County Council, TII, ESB Networks and Eir
  • Project Supervisor for the Design Process (PSDP)
  • Chairing and reporting on HAZID / HAZOP process
Key strategic gas transmission pipelines for Irish Gas

Solution

Our team carried out a site selection process for the new AGI and associated assessment of alternative routes for the bypass pipeline and other connecting pipelines. A total of thirteen sites were examined, followed by short-listing and final selection of the preferred site. 

Using GNI’s initial design concept, we developed a step-by-step construction process using a series of Engineering Line Diagrams. The final approach minimises the amount of degassing to atmosphere and ensures that there will be no interruption of gas supply during the works. A total of nine hot tap operations will be required.

The final AGI design, which received planning approval in 2019, incorporates a raised platform to meet the requirements of the OPW and minimise the risk of flooding to the site.  Surface water management at the site will involve an attenuation feature which has potential to be enhanced with biodiversity features.

A range of protective measures and requirements for the development (and captured in the outline CEMP) have been recommended to ensure the protection standard measures for surface water management and Biodiversity. These include the undisturbed retention of a riparian zone with clearly demarcated silt-fence, 10 metres back from the Ballough River to minimise disturbance to banks and in-stream habitats, and a prohibition on the soil stockpiles beyond that. Furthermore, works in the area will be scheduled to coincide with dates that will be approved by IFI and/or other agencies.