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Next Generation Grundfos CR Moves the Limits for Multistage Pumps

Pump Tips

The Heat is On

Temperature is an important fluid parameter to consider when selecting a pump. The temperature of the pumped liquid will affect viscosity, specific gravity, and vapor pressure--all important elements for making the proper selection. In addition, temperature will often affect the corrosive nature of a chemical. The higher the temperature, the more corrosive the chemical can be. This has an impact on the recommended materials of construction.

Don't forget to provide information on low temperature service also as freezing of water vapor in the surrounding air can result in an ice-packed pump. Sealless pumps are often the best choice for low and high temperature service because mechanical seals and packing are eliminated. Contact an IPE Application Engineer for assistance with your particular application.

Round and Round She Goes

We often receive calls from users stating that their pump does not meet the rated flow and head. The first thing that we ask: "Is the pump rotating in the proper direction?" A centrifugal pump uses an impeller and a volute to create head by converting velocity energy to pressure energy. Proper pump performance can only be achieved if the pump impeller is rotating in the correct direction. Pump casings or motors are usually marked with an arrow to indicate correct rotation.

Some positive displacement pumps are considered bidirectional; that is, they will operate satisfactorily in either direction. If the pump has an integral relief valve, however, it can only be operated in one direction. Check the pump manual for details on correct rotation.

Dry Run Protection

Where pumps are vital to your operation it is important to make sure your system stays fluid. But in the event something does go awry, a bit of warning could save your equipment. Running your pump dry can lead to seal failure or, even worse, complete pump failure. For example, installation of a Grundfos Liqtec Sensor or Load Control Power Monitor on a Flowserve Innomag unit will alert you when the pump is no longer moving liquid. This simple preventative measure will let you know there is a problem, either on your pump or within your system, before extensive damage occurs.

To Affinity and Beyond

The benefits of using a variable frequency drive (VFD) with a centrifugal pump are numerous, including energy savings, longer component life, and elimination of costly control valves. But how does a user know what a pump's performance is at reduced speeds if performance curves aren't available? Fortunately, the Affinity Laws can be used to determine flow, head, and HP. This image shows the relationships between pump speed and these three parameters. The same relationships are true with impeller diameters. Simply replace the RPM's with the impeller diameter(s) to determine the pump's performance.

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