Sutton Wick Case Study
Client: CEMEX
Project Value: £400K
Project Period: AUGUST 2021 TO NOVEMBER 2021
At their Sutton Wick closed landfill site, Cemex have a working Methane Stripping Plant but the leachate delivery from the well heads was not closely integrated. Cemex decided to change their pumps and control system to better integrate the systems.
Contract:
A construction Contract was awarded to Phoenix by CEMEX under the NEC3 Engineering and Construction Contract Option A.
Phoenix undertook the role of Principal Designer and Contractor.
Work included the full design and construction of the power supplies and integration controls system along with a new leachate balance tank.
BS7671:2018 amd2
The existing infrastructure includes a gas generating plant, methane stripping plant and flare. All of these were connected to a TN-C-S electrical grid supply and shared earthing with the gas generation plant.
A new grid supply was arranged by Cemex which Phoenix managed as part of the contract.
The sub-main power supply infrastructure for the whole site was replaced and new circuits were added for the pumping system.
For compliance with BS7671, the supply was changed to a TT earthing system. These changes included separating the gas plant’s 11kv earth system from the site supply earthing and inserting non-conducting sections in the shared metal compound fence.
The main earth was drilled down 20m by the offices for the new TT system. Each well also includes 5 m of earth tape laid along each trench as an additional earth for potential lightning strikes.
General View of the Site.
Field Work
Trenches and draw pits were formed from the MSP leachate storage tank to each of 18 wells.
Each well head has 2 ducts for future use, a power supply, control cable, local earth, and a control panel for the pump.
Integration
Within the existing control room, the existing compressor and air pump controls were removed, and a new distribution board was installed for the new pumping system.
Signals from the storage tank, wells and new electrically actuated valves were integrated with the existing infrastructure.
New Field Pumping Controls
Storage tank, manual and electrically actuated pipeline controls before lagging.
New Distribution Kiosk
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