Articles & Case Studies

Sewage upgrade contract

Posted: Thursday 28th February 2008

Leading pump hire specialist Sykes Pumps has supplied a huge battery of electric submersible and diesel pumps to help contractor Black & Veatch carry out a major sewage treatment infrastructure upgrade for Severn Trent Water.

The pumps were used to bypass the final effluent stage at the Strongford Sewage Treatment works in North Staffordshire thereby allowing Black & Veatch to construct two new reinforced concrete chambers for the plant.

Strongford Sewage Treatment works processes sewage and waste water generated by approximately 300,000 people in the Stoke-on-Trent and Newcastle under Lyme area. The final stage of the process involves the discharge of clean, final effluent into local water courses via a series of pipes.

Black & Veatch employed Sykes Pumps to over-pump from the treatment works directly into the water courses using some of the largest pumps currently available in the UK. The operation was divided into two stages; in one, Sykes supplied three 8” Super Wispaset 200 super-silenced diesel pumps and four 12” Super Wispaset 300 pumps to handle a combined flow of 1,250 litres per second.

The second stage required seven of Sykes’ 12” K304 electric submersible pumps to handle a flow of 2,000 litres per second.

The total pumping capacity was far in excess of that required for normal ‘dry’ conditions. Most of the time, only two of the 8” Super Wispaset 200 pumps were running; the other 8” pump and the four 12” Super Wispaset 300s were on standby to handle the huge flows that can result in storm or flood conditions.

Similarly, only two of the K304 submersible pumps were running full time while the other five were deployed only when required by increased flow rates.

In addition to the pumping equipment, Sykes also supplied 230 m of 18” and 16” drainage pipe to transfer the treated water to its final destination.

With the outflow from the treatment works thus diverted, Black & Veatch was able to complete its work and Sykes was able to off-hire the equipment after only 10 days.

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