New Grundfos CR – supplying water and boosting pressure

12.06.2001

Solutions for a wide range of industrial applications, e.g. aggressive liquids, extreme temperatures, explosive liquids, etc.

State-of-the-art hydraulics

Extremely small margins make all the difference to pump efficiency levels. The laws of fluid dynamics have therefore been studied carefully to find new ways of improving CR efficiency. The result of this intense development work is an increase in pump efficiency of 10 percentage points.

Firstly, internal leakage caused by the pressure differentials within the pump have been minimized.

Secondly, enhanced impeller design has resulted in a more streamlined flow in the impeller and reduced eddy flow and friction loss.

Thirdly, a higher Nq has been achieved by a small reduction in the pressure generated in each pump stage.

By continuing to apply new and existing knowledge, the team behind the CR is setting the standard for multistage pump efficiency and performance.

Designed to suit your needs

The Grundfos CR standard range is designed to suit the needs of most industrial applications. However, certain liquids or other technical circumstances may in some cases necessitate special pump designs or customisation in one way or another, for instance:

- Inlet pressure exceeds the maximum level recommended for the relevant pump

- High-pressure pump systems required – up to 40 bar

- Pumping gases or abrasive liquids

- Pumping high-viscosity or sticky liquids

- NPSH level causes cavitation or vortexing

- Legal considerations prohibit vertical pump mounting – for instance on ships or in areas subjected to earthquakes

- Application requires pumps without carbon or silicone materials

Superior protection measures ensure double reliability

The motor of any pump is as vital for operation as the pump itself. This is precisely the reason why Grundfos also designs and builds a large range of highly efficient and technically advanced motors. Each motor is perfectly adapted to the individual pump design in order to achieve an optimal balance between the performance, efficiency, and long-time running costs of the pump.

The table below provides an overview of the motor variants and designs that Grundfos offers for custom-built pumps. The list should not be regarded as complete. A multitude of special designs and motor features can be made available upon request.

The new Grundfos CR offers:

  • Dry-running protection

    25% of all pump failures are caused by dry-running. Grundfos CR offers a way to avoid dry-running altogether!

    Grundfos LiqTec™ - a finger on the switch

    The only way to prevent the disatrous consequences of dry-running is to have a finger on the switch at all times. The Grundfos LiqTec™ acts as such a finger by checking at intervals of a fraction of a second that there is liquid in the pump. And if there isn't, it stops the pump immediately.

  • New cartridge seal

    Hard-wearing seal materials prevent unnecessary and prolonged downtime in your system. Seal reliability is also enhanced by the cartridge design since there is no risk of assembling the components wrongly, preloading the spring incorrectly or getting greasy fingers and dirt on sensitive surfaces. These would all shorten the life of a seal significantly.

  • Custom built-solutions

    Custom-built pumps for any industrial application - the most comprehensive range on the market.

  • Outstanding materials

    As fast as the ferrous metals in a pump corrode at the hands of saline liquids, so too does pump reliability and efficiency. After dry-running, corrosive liquid is the next most common cause of shortened pump life. High-grade stainless steel goes a long way to making CR corrosion-proof, but extreme conditions require extreme measures.

    The CR is the only pump of its kind which comes in a full-titanium variant - CRT. Titanium is totally corrosion-free.

Source: Grundfos

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