PUMPS, VALVES & ACTUATORS
IDENTIFYING SAVINGS
Riventa has optimised pump performance A
t a critical pumping station supplying a major tourist destination near Paris, deployment of Riventa’s proprietary
FREEFLOWi4.0 pump monitoring system and HydraNet software has proved that the rescheduling of pumps to meet optimum performance, provides an immediate saving of 21%. Commissioned by water utility Saur, Riventa’s challenges were to identify a
SAFE, RELIABLE AND LEAK-FREE PUMPING
When fluids handling applications require safe and reliable pumping of thin, low viscosity liquids, such as liquefied gases or refrigerants, the new Dickow WPM Series is a suitable choice. Available from pump specialists MICHAEL SMITH ENGINEERS, these new options of self-priming, horizontal, side-channel pumps are suitable for handling clean liquids without solids in chemical and petrochemical industry applications. The magnet drive single or multi-stage side channel design of the WPM Series pump enables safe, leak-free pumping of thin liquids at 4 pole speeds of high differential heads up to 150m, covering flow rates from around 2l/min up to 40l/min. Compared to standard centrifugal pumps they offer more economical pumping when the combination of low capacities and high heads is required.
They are available in 316 stainless steel or Hastelloy-C materials and in two designs. One for system pressures to 16 bar, the other for system pressures up to 110 bar.. Maximum operating temperature for the standard pump design is 150ºC. They are also able to prime empty suction lines after initial filling with liquid to be pumped or any other liquid compatible with the pumped liquid. The magnet coupling with the static containment shell forms a closed hermetically sealed leak-free system which eliminates the need for double mechanical seals, along with external fluid reservoirs and associated control equipment.
The single elements of the multipolar magnet coupling are manufactured from Neodymium-Iron-Boron with unlimited lifetime operation, while the magnets in the driven rotor are completely encapsulated and not in contact with the pumped liquid. Power is transmitted to the hermetically sealed liquid end by a bank of external magnets with the inner and outer magnet rings securely locked together by the magnetic forces and work as a synchronous coupling. To achieve the self-priming capability, high efficiency and rated differential pressure, there
are tight clearances between the rotating impeller and the stationary disks. During priming, a stable fluid film between the impellers and the disks centres the impeller in the chamber. Michael Smith Engineers
www.michael-smith-engineers.co.uk 28 JUNE 2021 | PROCESS & CONTROL
potential reduction in life-cycle costs, as well as show how optimisation of controls and operations would bring about immediate and long-term savings in running costs, including energy efficiency. Riventa directly assessed the performance
of three large and three small variable speed pumps. They discovered that at the pumping station, during certain flow rates, the system operated at up to twice the cost of optimum operation for significant amounts of time - and was also well in excess of the lowest possible specific power.
Extending pump lifetime Steve Barrett, managing director of Riventa, commented: “From the existing total operating cost per year of just over 157,000 Euros, we showed that by optimising the current pumps, we could reduce that to less than 124,000 Euros – but it is the optimisation of pump schedules that provides the main benefit. Payback can be achieved in less than 12 months, with the significant improvements in operational performance also extending the lifetime of pumps.” He added: “Based on all of the pumps being
refurbished and operated at optimum configuration, the operating cost would lower even further to just under 113,500 Euros – though it must be said that the units were in good condition and a low priority for refurbishment at the time of the project. This means that capital investment can be focused on other priorities. Assuming a CAPEX of a little over 100,000 Euros, payback would be achieved in three years. This is a classic example of what can be achieved at pumping stations all over the world.”
Riventa
www.riventa.com
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