Preload tanks, often referred to as pre-stressed or wire wound tanks, have been used in the water industry since the early 1950s, primarily as water reservoirs. Built open-topped or fitted with domed roofs, the walls are cast in vertical panels and lightly tied together with continuous reinforcing bars. They are subject to a number of general weaknesses:

• Loss of stress in the wire, leading to opening up of joints and causing water leakage through the wall and possibly on to the wires.
• Deterioration in the mortar cover to wires.

Andrew Howard and Partners are in a unique position, having engineers who were involved in their construction in the 1970s. In conjunction with DSI, we can provide the following solutions and remedies:

• Detailed surveys
• Reports and recommendations
• Detailed specifications, method statements and construction sequences
• Remedial work
• Monitoring.

We also have experience of working in the water industry with:

• Three Valley Water
• South West Water
• Egham Water Treatment Works
• Thames Water Utilities
• West Essex Water
• Anglian Water.