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 Wrenthorpe PRS site was obsolete, approaching end of service life and in need of replacement.
The project comprised full electrical and instrumentation rebuild, installation of buried ducting and general site civil improvements to bring the site in line with current Northern Gas Networks standards and compliant with British and European legislation.
Employed directly by Northern Gas Networks as MWC, key deliverables were achieved to the satisfaction of and the end user (Northern Gas Networks) utilising the expertise of approved civil framework partners.
Redundant, non-essential electrical equipment was isolated and removed maintaining only the essential supply to the telemetry equipment. The new distribution equipment was then 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 installed to the clients G17 detailed design documentation and inspected and tested to BS7671 and the remainder of the essential services were transferred to the new distribution system.
In accordance with the G17 design the existing telemetry RTU panel, I.S. and Non-I.S. junction boxes were retained and re-used. The scope of the installation included pneumatic hook-up and cabling of Inlet Pressure Transmitter HP1, Outlet Pressure Transmitter MP1 and Filter Differential Pressure FLT-DP1 and FLT-DP2. Installation of switches and cabling associated with the Intruder Alarm equipment and replacement of cables to the Slam Shut indication switches. 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.
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.
SONAE were responsible for supplying both the NRO documentation and competent persons to control and execute the changeover in line with the networks SCO 5 requirements. Commissioning was phased to allow the existing and new E&I systems to operate in parallel before isolating and de-commissioning the old equipment ensuring continuity of supply throughout the 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.