This, the first pipeline section in the Milford Haven Gas Connection Projects, starts at a new above ground installation (AGI) at Herbrandston, west of Milford Haven, and adjacent to the South Hook Liquefied Natural Gas (LNG) import terminal. It passes north of Milford Haven to another AGI to the east of the town at Waterston, close to the site of the second new terminal being developed by Dragon LNG.

The pipeline heads north from here, passing to the east of Haverfordwest, crossing the A40 and running in parallel with it in an easterly direction before passing to the south of Narberth and St Clears to reach Llangynog, where we have constructed a block valve site. Llangynog is the approximate mid-point of this pipeline.

From here the pipeline continues south east, first crossing the River Towy and then the M4 north east of Llanelli, before heading eastwards to cross the Rivers Clydach and Tawe. The pipeline continues eastwards, finally connecting with the existing National Gas Transmission System to the north west of Aberdulais in the Vale of Neath, at another new AGI at Cilfrew, where pressure will be reduced so gas can flow into the pipeline network serving south Wales.

Consent to construct the Milford Haven to Aberdulais natural gas pipeline was granted in December 2005. Main construction work began in March 2006, and the majority of the pipe was installed by the end of the year.  the pipeline is complete, although reinstatement works will continue in some areas in 2008.

Above ground installations and compressor station

In addition to the new sections of pipeline, a number of AGIs have been constructed, which include valves and essential support equipment for the pipelines. Construction of a new compressor station at Felindre is expected to be completed by the end of 2008.