Sanivar have recently completed work at Fowey Harbour as part of South West Water’s sewage pipework regeneration project.
Town Quay Sewage Pumping Station in Fowey is the terminal sewage pumping station receiving flow from southern and northern collector sewers. As the pumping station and HDPE rising along the foreshore was constructed two decades ago as part of the clean sweep up programme, a short section of the pipework within and adjacent to the sewage pumping station made of ductile iron, had severely degraded over the years due to the saline environment. Had there been no intervention, failure would have caused a pollution incident in the shellfish estuary, in which the consequential repair work would have had significantly affected the town and its tourism industry.
The regeneration project looked to improve the ductile iron pipework in order to eliminate any further risk of pollution in the area by lining with stainless steel, a two-metre section of ductile iron pipe both in the slipway and foreshaw and by replacing the other pipework within the pumping station chamber located in the foreshaw. Working alongside one of the UKs leading firms of consulting engineers, Pell Frischmann, on the design, Sanivar provided their innovative Sanitube product with a bespoke Sanigrip end fitting on one side, which was then anchored to the wall, allowing existing pipework to run directly from it. And they also had to design a fully bespoke end fitting, due to the difficulty with access below sea level and there only being access from a single opening in the pipework.
The project itself was particularly challenging due to the varying size of the sewage pipeline but the flexibility of Sanivar’s products and the ability of Sanivar to engineer a bespoke coupling for this project ensured that these significant challenges were overcome.
The installation of the project was carried out by Exjet, and the main contractor on site was Kier Construction. Because the project needed to be undertaken within a tight timescale and as it was also subject to restrictions due to the incoming tide, the complete installation of the Sanitube from opening up the pipework to re-fitting pipework from it, had to be completed within a 3 day window. Sanivar was also on hand to offer installation support and supervision throughout. Working together with the other contractors, the project was a great success in that it provided a solution to the damaged pipework, all whilst ensuring that there was minimal impact on, and interference with, the surrounding environment.
Due to the success of the project, the Town Quay Sewage Pumping Station regeneration project has been nominated for an award from the UK Society of Trenchless Technology (UKSTT).