Farnham, Oxfordshire – Supply and Build of Glass Coated Tank with GRP Roof
Introduction
Thames Water faced a critical challenge with an ageing tank in a state of disrepair that posed a risk of failure. Franklin Hodge provided a comprehensive solution by replacing the tank with a new glass-coated tank (GC tank) on the existing base, ensuring operational continuity and safety.
Client Background
The client, a major water utility provider, required the replacement of a 17.91m diameter by 4.80m high tank to address significant structural degradation. The existing tank’s condition necessitated immediate attention to prevent potential failure.
Challenges included:
- Coordinating tank replacement with ongoing slurry removal operations involving up to six tankers daily.
- Addressing physical constraints caused by the existing plinths and pipework.
- Ensuring precise positioning for air and liquid input points.
Franklin Hodge Solution
1. Tank Removal and Base Preparation
- Franklin Hodge engaged a specialist demolition company to safely and efficiently remove the old tank and roof.
- The existing rebate cast-in angle was removed, and a new rebate channel was cut and manually bottomed out using robotic breakers and floor saws.
2. New Tank Installation
- A 17.91m diameter x 4.80m high glass-coated tank with a GRP roof was built on the existing base.
- The tank walls were constructed to a height of two and a half panels. A static support tower was installed, and GRP roof petals were individually placed using a crane.
- The remaining panels were positioned using a jacking system after the roof cover was installed.
3. Customisation for Operational Requirements
- Close collaboration with the M&R contractor ensured all air and liquid input points were accurately cut on site.
Results
Operational efficiency: The new tank installation-maintained continuity despite the daily removal of slurry by tankers.
Durability and safety: The glass-coated tank met the highest standards for long-term reliability and safety.
Timely delivery: The project was completed on schedule and within budget, despite multiple operational challenges.
On-time delivery: The project was completed safely and within the scheduled timeline.
Enhanced system reliability: The new tanks deliver improved reliability, exceeding the client’s expectations.
Challenges Overcome
- Operational coordination: The Franklin Hodge team worked closely with site management to ensure uninterrupted slurry removal operations.
- Physical constraints: The build was carefully planned and executed to navigate existing plinths and pipework.
- Complex installation: A methodical approach, including the use of cranes and a comprehensive jacking system, ensured the safe and efficient placement of the GRP roof and tank panels.
Conclusion
This project highlights Franklin Hodge’s expertise in delivering tailored solutions for complex water storage challenges. By combining innovative techniques, expert collaboration, and precision engineering, the team delivered a durable and compliant glass-coated tank solution on time and within budget.
Close proximity of original tank to other elements.
Space was restricted.
Jacks in place.
Inside post roof placement.
