NETZSCH REDUCES LIFE CYCLE COSTS AT UNITED UTILITIES
Before installing progressing cavity pumps from Netzsch, the United Utilities site at Davyhulme in Manchester faced spiralling repair and replacement costs. By switching supplier, one of the largest wastewater treatment works in the UK has significantly reduced its maintenance bill, saving in excess of £200,000 over a five year period.
Explaining the problems the company were facing, field service engineer Frank Vanden says United Utilities were originally offered a trial from Netzsch at a time when they were disillusioned with progressing cavity pumps (PCPs).
“The Netzsch pump, which is still installed and working today, not only proved more reliable but was also offered with a nine or twelve month warranty on the rotor/stator depending on the process. This was much better than our previous supplier.”
Having proved so reliable, the Davyhulme site chose to replace the original PCPs on its gravity belt thickeners with Netzsch’s pumps, including five SY long-coupled feed pumps and four BO open-hopper discharge pumps. These are used to feed sewage sludge, containing up to 8% dry solids content at pressures around 3 bar, through gravity belt thickeners.
Commenting on the application, Netzsch’s environmental sales engineer Rob Isaacson explains how the company helped to reduce life cycle costs: “By installing a larger capacity, long-coupled pump, we were able to decrease rubbing velocity to less then 0.8m/s whilst maintaining a high flow rate. This combined with a two-stage ‘D’ rotor geometry ensured a much-reduced level of wear, which in turn led to a reduction in costly maintenance and process downtime.”
The five SY progressing cavity pumps also feature double-sealed, closed-gear joints with patented NEMO® SM seal and protective cap. These oil-filled joints give the components a much longer life and the unique sealing system makes the joints less prone to damage from product abrasion. The pumps are also fitted with Netzsch’s STP2 stator dry-running protection to further minimise the risk of wear and breakdown.
Says Rob Isaacson: “Companies often forget that after the initial purchase, the cost of installation, spares and maintenance all contribute to the overall cost of a system. We are dedicated to reducing life cycle costs and our pumps are recognised within the water industry for long life and low maintenance. Through innovative product development and by refusing to compromise on quality, Netzsch is able to reduce operating costs by up to 75% and provide a return on investment within twelve months.”
For further information on Netzsch’s range of progressing cavity pumps, call 01922 453433 or email sales@npu.netzsch.com.
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