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Southern Water needed to replace the pump motor and control system, which were becoming obsolete and increasingly unreliable. Installed for over 30 years, spare parts such as contactors and control cards in the main panel were becoming difficult to source and maintain.
The existing 75 kW DC motor required maintenance to its brushes every three months and a recent failure had made it critical to find a more reliable solution. A major consideration for Southern Water was cutting operational and downtime costs as part of the total expenditure (TOTEX) approach adopted by Ofwat’s latest Asset Management Period, AMP 6.
Under AMP 6, water companies are being encouraged to re-focus attention away from the traditional capital and operating expenditure (capex/opex) spending models towards a total expenditure, or TOTEX, approach, one that emphasises controlling operational and maintenance costs.
Southern Water contacted ABB authorised value provider, MKE, which recommended the ABB SynRM and drive package. The SynRM uses the magnetic principle of reluctance, eliminating rotor cage losses and increasing efficiency, all within a smaller motor frame size.
With lower losses, the SynRM also runs cooler, cutting maintenance costs by extending the lifetime of the motor insulation and lengthening the bearing lifetime or greasing intervals.
MKE installed a 75 kW SynRM motor with an IE4 efficiency rating. To control the motor, MKE supplied an ABB drive, ACQ810, which is specifically designed for water and wastewater applications. Its intelligent pump control software offers macros that can be customised to meet the requirements of single or multi-pump systems.
As part of the solution, MKE also supplied ABB’s power quality filter manager (PQFM), which offers one master and up to seven slave units to form a factory tested and assembled system. As well as reducing the effects of harmonic currents and voltages, a particular threat to water facilities, ABB’s PQF solutions perform smooth
reactive power compensation and load balancing.
As well as improved reliability, the ABB drive is also expected to produce a four percent increase in motor efficiency, further cutting operating costs.
Matt Dean, field performance manager for West Sussex, says: ‘This is one of Southern Water’s most important sites so reliability is key. We’re running this pump as our duty pump because it’s the most efficient system and it’s been 100 percent reliable. The fact that we’re now spending less time maintaining old equipment means that we can spend more time being proactive elsewhere.
OTT launches feature-packed ‘Hydromet Cloud’
The OTT Hydromet Group has launched a new web-based data management service for remote monitoring stations. “Hydromet Cloud represents a step-change in data management,” comments UK Managing Director Nigel Grimsley. “Subscribers to this new service are provided with fast, simple access to both live and historical data, which opens new opportunities for exploiting the value of ‘Big Data’.”
Packed with new features and highly cost- effective, Hydromet Cloud provides users with easy access to secure data from field monitoring sites at any time and from almost anywhere via
hydrometcloud.eu or the Hydromet Cloud mobile App. Typical applications include hydrology, meteorology and water quality.
Data are transmitted from field stations through a variety of methods including satellite, cellular (GPRS/3G/4G) or wired internet connection, and stored/backed-up in the cloud.
Designed for flexibility, users are able to create their own dashboard to quickly collate frequently
viewed data, which can be displayed as plots, tables or values, and exported in a variety of formats, which enables easy analysis of trends. This facility to create a bespoke display is enhanced by a map view with colour-coded map pins (for alarm status), current data values and colour-coded parameter values highlighting alarm status. Alarms are user-defined for values, rate of change etc. and alarm messages are issued automatically by email, text or push notification on a mobile phone. Separate limits can be set for both warning and critical levels, and users can also create alarm distribution groups for notifications.
The Hydromet Cloud mobile App provides a quick and easy opportunity to view the status of an entire network or an individual monitoring station, with options to send/share data directly from a smartphone or tablet (iOS or Android). It is also possible to create and save ‘My Plots’ to quickly recall
follow us on twitter @draintrader | April 2017 | drain TRADER 23
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