Contains the full lesson along with a supporting toolkit, including teachers’ notes.
Establishing the Viability for Connecting New Towns
The Gaslink Connections Policy sets out the criteria for connecting new towns to the natural gas network. To evaluate the potential viability for the connection of a new town, an economic appraisal is carried out. This appraisal takes into account the following:
If the appraisal returns a positive result then the town is viable for connection to the Bord Gáis natural gas network subject to approval from the Commission for Energy Regulation.
Bord Gáis Networks generates revenues by applying the relevant transmission and distribution tariffs for the use of the pipeline system by shippers. At present there are twelve shippers signed up to the Code of Operations in ROI and one shipper in Northern Ireland.
Designing the Network
There are two main divisions of a gas distribution network:
Transmission pipes are made of steel, while distribution mains (local "gas pipes") are made of polyethylene (PE). These PE mains are used for pressures not exceeding 4 bar. PE mains have gradually replaced cast iron and other metallic mains.
Pipe sizing depends on the required final pressure (at thecustomer point) and on the expected load or demand. Potential large industrial/commercial and contract customers in the towns are consulted with regard to future expansion plans and these loads are catered for in the network design.