Bells & Mocketts Pumping Station
The Brief
The newly built Bells & Mocketts Pumping Station on the Isle of Sheppey required an efficient and fish-friendly solution capable of lifting 3.5 cubic meters of water per second. The challenge was to find a pumping system that not only met the operational needs but also prioritised the well-being of aquatic life in the Medway estuary. Traditional pump designs posed risks such as run-back, turbulence, and potential harm to fish, necessitating a highly innovative approach.
The Solution
Innovative Archimedean Screw Pump Design: ACE provided a groundbreaking solution with two Archimedean Screw pumps, each with a diameter of 2.5 meters and a length exceeding 10 meters. These screws, manufactured using advanced materials like Vinyl Ester Composite, featured an enclosed design that eliminated run-back issues. The Archimedean Screw’s curved leading edge reduced turbulence, ensuring gentle guidance for fish. The rotating outer drum eliminated pinch points that could harm fish, and the system operated at low speeds (11.2 RPM – 23.3 RPM) without the need to compensate for run back.
Variable Speed Operation: The rotating drum allowed for a flexible operating philosophy, enhancing efficiency, and often eliminating the need for multiple screw pumps. This variable speed solution optimized pump performance according to specific conditions.
Quick Installation: The prefabricated design of the screw pump, including motors and gearbox onto a single frame, facilitated quick and safe installation, minimizing downtime and project delays.
Composite Materials for Corrosion Resistance: The use of composite materials in construction offered superior corrosion resistance and stiffness compared to traditional steel structures. This innovation enhanced the pump’s longevity and maintained fish pass ability while reducing the need for extensive maintenance.
Reduced Hydrostatic Head: The effective hydrostatic head was reduced by 1.25 meters compared to traditional screw pumps, thanks to the seal between the rotating drum and outfall. This reduction in hydrostatic head minimized potential environmental impacts.
The Result
Fish-Friendly and Efficient Pumping System: The implementation of Archimedean Screw pumps with innovative design elements ensured the Bells & Mocketts Pumping Station operated as the most fish-friendly pump available. The reduction of run-back, turbulence, and pinch points, coupled with low rotation speeds, significantly enhanced fish pass ability and overall system efficiency.
Operational Flexibility and Longevity: The variable speed operation, quick installation, and use of composite materials contributed to operational flexibility, reduced wear, and increased longevity. The pumping system operated efficiently at low speeds, meeting the specific needs of the Lower Medway Internal Drainage Board.
Achievements
01
Engineering Excellence
ACE’s innovative design of the Archimedean Screw pumps showcased engineering excellence, addressing environmental concerns and operational efficiency simultaneously. The use of advanced materials and thoughtful design elements set a new standard for fish-friendly pumping systems.
02
Collaborative Success
Aquatic Control Engineering extended gratitude to the Lower Medway Internal Drainage Board for their assistance in the project. The collaborative efforts ensured the successful implementation of a cutting-edge pumping solution that met and exceeded the client’s expectations.
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