Severn Trent is flagging up a forthcoming £8.4 million AMP8 tender for digestor roof replacement design & build works with a current estimated total value of £8.4 million (inc VAT).
The works requirement is for the provision of new replacement fixed steel painted digester rooves. The appointed contractor(s) will be required to develop both the outline and detailed design and undertake build in the role of Principal Designer and Principal Contractor. The works include;
- Outline and detailed design
- Digestor decommissioning & purging (emptying/ cleaning/waste management)
- Demolition and disposal of existing steel roof
- Build including any remedial works (roof fabrication & installation civils/MEICA/DSEAR/ Welding Electrical & Instrumentation)
- Reinstatement & commissioning
The works will include requirements for surveys, temporary works, necessary plant, equipment, materials, site management and welfare facilities.
The framework's objective is to:
- Replace aging assets, providing new fixed roofs to digesters. The new, fixed roof is to be sealed preventing any foam and sludge leakage from digester sludge seal annulus associated with floating roofs, reducing pollution events.
- Improve safety associated with the new assets. Including upgraded lightning protection, enhanced monitoring and control around digester gas headspace, and protection against rapid volume expansion (RVE's).
- Significantly reduce the risk of serious structural failure of the roof
- Drive benefits to Net Zero efficiencies
- Comply with company digester design manual and specifications (fixed roof)
- Comply with the Environment Agency's Industrial Emissions Directive (IED), achieving compliance before end of AMP8.
Works completion date across all sites is required by 2030.
Framework duration is 8 years with current estimated start and end contract dates of 30 September 2026 to 29 September 2034.
Estimated publication date of a formal tender notice is currently 28 September 2026.