Thames Water’s £190m upgrade and expansion of Beckton Sewage Treatment Works (STW) has utilised Durapipe Corzan within a new cooling circuit.
The major improvements at Beckton STW, part of the wider £5bn London Tideway improvement programme, will enable the site to treat 60% more sewage including additional storm flows from the Lee Tunnel, a new four-mile sewer, which will capture storm sewage that currently overflows into the River Lee.
The extensive works include a new treatment stream and sludge treatment plant, which incorporate six new aeration lanes for the activated sludge plant and new circular final settlement tanks. The project also includes the construction of a thermal hydrolysis plant (THP), an advanced form of anaerobic digestion, which will have the capacity to produce up to 50% more biogas.
As part of the new treatment plant, a series of large electrical transformers have been installed and therefore a cooling system was required to maintain the temperature of the transformers. M&E Contractors Donland Engineering was tasked with installing the new cooling circuit and turned to Durapipe Corzan for the pipework requirements.
The cooling circuit utilises a coolant comprising of 70% water and 30% Glycol, the solution leaves the transformer at 42°C and is pumped through air blast coolers, which reduce the temperature to 36°C, with the cooled water re-circulated back to the transformer.
A reliable and durable pipework system was required to safely transfer the coolant around the cooling circuit and 75mm Corzan pipework was installed to convey the fluid. Due to the corrosive properties of this specific glycol-based solution, it was crucial that a corrosion resistant pipe material was selected, which led to the specification of Corzan.
Commenting on the installation, Mike Cooper from Donland Engineering said: “Due to the levels of glycol present in the system, we needed a system that was corrosion resistant, while the client was also looking for a low maintenance solution that would last for at least 20 years. Corzan ticked all the boxes so was the ideal choice for the application, but the quick and easy installation of the system also saved us time ensuring we could meet the installation deadlines.”
Durapipe Corzan is a purpose-designed system for handling hot, corrosive fluids. The high performance C-PVC material is corrosion resistant and has the ability to convey hot acids and alkalis under pressure at elevated temperatures. Benefitting from ease of handling, due to its lightweight properties, and simple jointing methods, Corzan offers significant time and cost savings during the installation process.