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Southern Manufacturing

Farnborough, Hants(GU14 6TQ)

20/04/2021 - 22/04/2021

Southern Manufacturing and Electronics is the most comprehensive annual industrial exhibition in the (more)

PPMA Show 2021

NEC, Birmingham(B40 1NT)

28/09/2021 - 30/09/2021

PPMA Show 2021 will be the UK’s largest ever event dedicated to state-of-the-art processing and (more)

Advanced Engineering 2021

NEC Birmingham(B40 1NT)

03/11/2021 - 04/11/2021

Join us in our 12th and most important edition to date, as we invite engineers and management from all (more)

Replacement drive system keeps Severn Trent on track

Replacement drive system keeps Severn Trent on track

Deritend Wolverhampton has helped prevent downtime at a Severn Trent water treatment plant by offering a repair service that cut the delivery time of a step filtration screen from three months to three weeks. By replacing the mechanical drive system from designated stock and being able to fabricate intricate new screen components, Deritend avoided manufacturer lead times and the cost of new spares. As a result, Severn Trent was able to get the water treatment plant back operating at full capacity with the minimum of delay.


As part of the maintenance contract between the two companies, Severn Trent Water contacted Deritend Wolverhampton in September last year, with a view to repairing one of the main inlet filtration screens at its Mansfield treatment works. One of the two worm gearboxes used to drive the moving frame over the step-type filter had suffered an unpredictable failure, resulting in bent shafts and misalignment of the screening elements. The design is based on two interlocking screens made up of hundreds of stainless steel sheets (laminar) with 45 degree steps cut into the outer facing edges. A cam-based drive system jogs the upper filter frame in an circular motion, moving half of the laminars up and over the fixed screen positioned in the main body of the filter, pushing any solid waste up the series of steps to the top of the screen for extraction.


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