Articles & Case Studies

Challenging traditional tank installation

Posted: Wednesday 27th August 2008

Concrete specialist, Millbury Systems, part of the Eleco Group, has installed a modular pre-stressed stormwater attenuation tank under a public open space within a new housing estate at Ferrybridge in Yorkshire. The tank has provisionally been adopted by Yorkshire Water in what could be an early indication that the water industry will be considering changing its traditional policy with regard to in situ concrete tanks.

Milbury designed, manufactured and installed the tank for Bramall Construction which is currently building a 120 house social housing scheme for Wakefield District Housing at Ferrybridge.

Working with Bramall’s construction consultants, Peters Associates, Milbury visited the site to calculate the dimensions required and gained approval from Yorkshire Water for the design. The prestressed concrete panels for the 18m x 11m, 2.5m deep tank were manufactured at its factory in Lydney, Gloucestershire, for delivery to the site during March. Installation was completed in three weeks and the tank has now been provisionally adopted by Yorkshire Water.

“Traditionally the water industry favours the on site construction of reinforced concrete tanks or GRPs in situations where it is necessary to prevent storm water from overloading the existing drainage system”, commented Richard Levin, senior quantity surveyor at Bramall. “This can be both costly and time consuming for the contractor.”

“We looked at a variety of alternatives systems for the space available”, “The cost and speed of installation made the option of installing Milbury’s concrete panel attenuation tank very attractive.

“Milbury installed the tank in just three weeks; it could take between eight to twelve weeks for an “in situ” construction. This is a much faster and cost effective system which could be used on a wide variety of schemes and it is the first time to our knowledge that Yorkshire Water has agreed to adopt a precast panel tank. Millbury provided an excellent service from design through to the installation and we were delighted with the results.”

“We have successfully installed the precast prestressed concrete tank system on a number of industrial estates throughout the country,” said Brian Mees, director at Milbury Systems.

“And we are obviously very pleased that our tank design has been “provisionally adopted” by a water company which is clear recognition of its viability. The precast panel tank is very adaptable and can be used in a wide variety of situations; the roof panels can be designed for heavy traffic loading. “We believe it is likely that more developers will look at installing modular prestressed tanks in the future as a time-saving cost effective option for storm water attenuation and rainwater harvesting.”

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