The Project

As a result of the Asset Health Survey Programme carried out by Northern Gas Networks under the RIIO price control period, it was identified that the existing plant and equipment at Poole Roundabout PRS site was obsolete, approaching end of service life and in need of replacement.

The project comprised a full civil, mechanical, electrical and instrument rebuild to bring the site in line with current Northern Gas Networks standards and compliant with British and European legislation.

Employed directly for Northern Gas Networks to carry out the E&I Installation works associated with the site re-build, SONAE worked closely with the MWC (RJ Utilities) to ensure key deliverables were achieved to the satisfaction of and the end user (Northern Gas Networks).


A new governor kiosk with integrated E&I room was constructed housing an all new electrical distribution system. A new electrical system was installed comprising incoming switchgear, overcurrent and earth leakage protection and small power distribution system servicing new interior and exterior site lighting, E&I room lighting and heating and telemetry power supply unit. The installation was delivered in accordance with the clients G17 detailed design documentation and inspected and tested to BS7671.


An all new remote telemetered instrument monitoring and control system was installed in the E&I room. The scope included the manufacture and installation of new RTU, I.S barrier, Non-I.S and PSU control panels. Pneumatic hook-up and cabling of Inlet Pressure Transmitter IP1, Outlet Pressure Transmitter LP1 and Filter Differential Pressure FLT-DP1 and FLT-DP2. Installation of switches and cabling associated with Slam Shut and Intruder Alarm equipment. Pneumatic Pressure Testing of new small bore stainless steel impulse pipe and instrument loop checks. Isolation, disconnection and removal of redundant, obsolete equipment following instrument changeover.

DSEAR Inspection

All ATEX certified equipment supplied and installed under the contract scope was subject to detailed inspection in accordance with DSEAR Regulations BS EN 60079-17.


Preparation and submission of Non-Routine Operation (NRO) document for Authorising Engineer approval prior to pre-commissioning checks.

Provision of SCO 4&5 competent persons to carry out the end to end checks and wet commissioning of the complete E&I installation under a controlled NRO procedure.


Test Records and red-line marked as-built drawings were produced and submitted at key stages as identified by Northern Gas Networks for pre-commissioning purposes in accordance with management procedure NGN/PM/RE/18.

Databook records were compiled in accordance with MPTF-001 Databook Framework document.

All final handover records were submitted to the Northern Gas Networks in both electronic format via A-site media document control system and hard copy format.

Health & Safety

All works were carried out under a controlled PTW in accordance with Northern Gas Networks SCO (Safe Control of Operations) management procedures.



November 2016
Northern Gas Networks