Wasserverteilung

Überblick

Überblick

Effizientes Druckmanagement von der Quelle bis zur Entnahmestelle

Um Wasserverluste durch Leckagen zu reduzieren und damit die Kosten für die Wasserverteilung zu senken, bietet Grundfos optimierte Pumpensysteme mit Proportionaldruckregelung an, mit deren Hilfe nicht nur die Pumpen- und Anlageneffizienz gesteigert werden kann. Sie sorgt auch dafür, dass beim Endverbraucher immer der richtige Druck anliegt. Unsere äußerst zuverlässigen, intelligenten Pumpen helfen zudem bei der Überwachung des Wasserversorgungsnetzes, damit Sie beruhigt Ihrer Arbeit nachgehen können.

Heute gilt ein effizientes Druckmanagement als die beste Möglichkeit, Leckagen aufzuspüren und gering zu halten. Wir kombinieren Pumpen, intelligente Komponenten und eine lückenlose Anlagenüberwachung so, dass eine effiziente Druckmanagementlösung entsteht, um den Stromverbrauch sowie die Kosten für Wasserverluste und die Wartung der Versorgungsleitungen zu senken.

Anwendungen hierzu

Demand Driven Distribution

Water companies continue to dedicate significant resources to resolve issues related to non-revenue water (NRW). NRW is water that has been produced and is “lost” before it reaches the customer, thereby costing water companies’ money. The International Water Association (IWA) has developed a detailed methodology to assess the various components of NRW, identifying the following components: unbilled authorized consumption, apparent losses such as water theft and metering inaccuracies, and real losses.

Grundfos is particularly well placed to reduce and control real losses caused by leakage from holes in the mains. Grundfos can help in two ways – by reducing considerably surplus pressure in the pipes system and by lessening the risk of water hammer which causes new holes. The solution in both these cases is the Grundfos Control MPC.

Important to reduce leakage losses

Reducing leakage and overflow requires initiatives such as increasing the speed of leakage detection, optimising asset management and not least by designing a pressure management strategy. Pressure management is now well recognised as being essential to effective leakage management.

Central to a typical strategy is to minimise the losses to existing leaks and reduce the risk of new leaks. Of the methods available for pressure management (pressure reduction, surge relief and level control), pressure reduction is the most common with several approaches available. Grundfos has developed systems to support pressure management systems, and these are integrated in our pumping solutions.

Surplus pressure and water hammer major culprits

The surplus system pressure that arises in low flow situations is a major culprit for increasing losses through existing leaks. The proportional pressure functionality built into the Grundfos Control MPC is a unique tool for eliminating this surplus. The controller monitors system conditions, detects the increase in system pressure and adapts the set point accordingly. For the consumer there is no change in tap pressure, but leakage is reduced significantly.

Best known in the Grundfos Hydro MPC booster using vertical multistage centrifugal pump (CR) pumps, the Grundfos Control MPC is also used with systems with other than CR pumps.

An important contributing factor behind new leaks is water hammer. Caused by sudden momentum changes in a pipe system, this phenomenon can be reduced or eliminated by lowering fluid velocities, gradual pump rampup/ramp-down or reducing pump size, for example. Software analysis packages exist today; these vary in complexity, dependent on the processes modelled.

One example is that the sudden momentum changes that cause water hammer can be avoided by a gradual ramp-up, likewise with ramping down. This is a standard pre-programmed function in the Grundfos Control MPC.

Control NRW and optimise the pumps system

Leakage and overflow can cost water companies much more than the water lost from the distribution system. Grundfos expertise is always available to safeguard customers’ pumps system against the destructive effects of water hammer and surplus pressure.

By analysing system conditions and consumption patterns, Grundfos specialists assess the options for each distribution network. Our recommendations are held up against the economic level of leakage and the resources available to maintain a viable pressure management strategy.

For example, a big pump has a big water hammer effect; this is a factor of the pump’s inertia. Smaller pumps reduce the risk of water hammer and involve lower capital investment and operating costs and will reduce energy consumption and leakage loss.

Proportional pressure control unique to Grundfos

Proportional pressure control automatically optimises energy consumption and minimises water loss and is a solution unique to Grundfos. In the Control MPC, proportional pressure control compensates for excessive system pressure by automatically adapting the set point to the actual flow. In situations with high low, the pressure loss in the pipe system is relatively high. If the pressure loss in the pipe system is 1 bar, the discharge pressure of the system must be set to 6 bar in order to deliver a system pressure of 5 bar.

In a low-flow situation, the pressure loss in the pipe system may only be 0.2 bar. This would increase system pressure to 5.8 bar if the set point is fixed to 6 bar. The surplus 0.8 bar represents excess energy consumption and a strain on the mains pipes.

To compensate for this excess system pressure, the proportional pressure function automatically reduces discharge pressure to 5.2 bar, yielding significant reductions in energy consumption and non-revenue water.

Downloads


Demand Driven Distribution

Demand Driven Distribution

Reliable and cost-effective water distribution.


Pump handbook

Pump Handbook

A guide to dimensioning and optimising reliable pumping systems.


DDD

Demand Driven Distribution case story

Grundfos Demand Driven Distribution provides substantial reductions in leakage losses and energy costs.


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