Refurbished St Pancras Station Features Fullflow Syphonic & Gravity Systems

Fullflow has recently completed the design and installation of a combined syphonic and gravity rainwater system as part of the £600m refurbishment of the Grade 1 listed St Pancras Railway Station in central London. The contract was won by a consortium of four contractors; CORBER (Costain O’Rourke, Bachy & Emcor Rail) and was overseen by English Heritage. The Grade 1 listed building required meticulously accurate restoration making the project one of Fullflow’s most challenging to date.

The stations main train shed known as the Barlow Shed was built in 1868 and at its time was the largest single-span structure in the world, today it is still the tallest – 30 metres – and widest – 74 metres – single span train shed in the country. The shed is flanked by side buildings on both east and west aspects and abuts St Pancras Chambers on the southern end, facing onto Marylebone Road. The project required a flexible drainage solution to drain both the vast roof area of the Barlow Shed, to either side, but also to incorporate the east and west side building drainage. All pipework replaced on the building façades reflects the original installation of 1868.

The eastern half of the Barlow Shed drains into a traditional lead gutter incorporating 23 syphonic outlets draining into 6 separate syphonic systems. These systems drop internally within the adjoining east side building which then drains into bespoke chambers before finally draining into the fleet sewer. The east side building roof itself drains again from the lower level gutter but via 23 ornate cast iron hoppers and rectangular downpipes on the east side building façade.

The western half of the Barlow Shed drains into a traditional lead gutter and out to 16 ornate cast iron hoppers and downpipes on the building façade before issuing onto the adjacent west side building flat roof area. This flat roof area drains via roof outlets and HPDE gravity rainwater systems internally within the west side building area.

The glass transition roof between the Barlow Shed and Chambers drains via 8 ornate cast iron downpipes located on the internal southern elevation façade. They are linked to two horizontal HDPE collection pipes, one running in the void below the train platform and one in the undercroft floor void. The refurbished buildings are designed for a protection level of 230mm/hr compared to the 50mm/hr when the station was originally built.

Andy Lucking, Package Manager on behalf of CORBER commented;

“Working within the challenging confines of the Grade 1 Listed building, Fullflow developed the design in a sensitive way which was mindful of the client’s precise requirements. My working relationship with Peter Squire (Fullflow Project Manager) was good; he was both helpful and proactive in his approach to this project. The result has been an extremely successful installation of rainwater systems that meet the specific contractual requirements and completion date for our client.”

The multi-million pound refurbishment has transformed St Pancras International and is now the new home of the Eurostar. On the 14th November 2007 the first Eurostar trains will begin running in and out of the new terminal allowing passengers to travel to Paris and Brussels on the high-speed Channel link in just a few hours.

Fullflow boasts an unparalleled level of experience in the field of syphonic drainage having successfully designed, manufactured and installed over 30,000 systems across the world. Other completed prestigious projects include T5 B Terminal at Heathrow, The Millennium Stadium in Cardiff, Blue Water Shopping Centre in Kent, The Treasury Building in London and Barajas Airport in Madrid which is one of the largest European construction projects of this decade.

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