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The history of ice-making can be traced back to the mid-1700s. More than 250 years later, ice is available wherever and whenever a consumer wants. Ice machines are commonplace, from hotel hallways and sporting venues to restaurants, bars and cafes.

Second only to electric motors, centrifugal pumps are usually the simplest machines in a typical process plant. Pumps have fewer parts and are not nearly as complex as modern aircraft jet engines, for example.

Pumping systems comprise almost 25 percent of all motor energy usage in building and HVAC, water and wastewater, oil and gas extraction and transportation, and irrigation applications. Efficient pumping systems can save users more than 50 percent in potential energy costs.

Submersible pumps provide a powerful solution when high heads or high lifts are required at some job sites. The submersible pump end also eliminates suction lift limitations, allowing pumping in deep excavations, manholes, open pits, quarries or mines.

The Jordan, Knauff & Company (JKC) Valve Stock Index was up 13.8 percent during the last 12 months, while the broader S&P 500 Index was up 17.2 percent. The JKC Pump Stock Index was up 31.3 percent for the same time period.1

The chemical-manufacturing industry has stringent requirements for process equipment. Production efficiency, product quality and operational safety for both on-site personnel and the environment are critical concerns for any manufacturer of specialty chemicals investing in new or better processes.

One of the supposed advantages of centrifugal pumps when compared to positive displacement pumps is their ability to operate across a wide flow range. Because a centrifugal pump operates at the intersection of a pump curve and a system curve, varying the system curve allows the operating point of the pump to change easily using the discharge valve.

The most versatile pump used for fluid transfer in sanitary applications is an air-operated double diaphragm (AODD) pump. AODD pumps are well-known for their ability to stall under pressure, meaning that no external controls are necessary to start and stop the pump.

Pumps are the lifeblood of amusement park rides, water attractions, pools and spray parks. They facilitate the thrills, deliver the cooling enjoyment and provide the means of vehicle transportation throughout the leisure and attractions industries.

My last two columns (Pumps & Systems, April and May 2014) explained how pump suction behavior depends on how suction pressure is reduced. The original video, which showed two suction pressure tests, was presented.



In my June column on pump and motor testing, I said that three-phase voltage variation and unbalance can have a significant effect on motor insulation life. Voltage variation is defined as the difference between the motor nameplate voltage and the incoming source voltage.

One of the supposed advantages of centrifugal pumps when compared to positive displacement pumps is their ability to operate across a wide flow range.

A reciprocating power pump, as depicted in Figure 1, is a displacement machine. It has characteristics that are different than a centrifugal pump.


The global water crisis claims 5,500 lives each day—more than war, natural disasters, AIDS or hunger. It is a sobering problem but not an impossible one to solve.

SKF hosted their annual Technical Press Day on June 9, 2014, at Penske Headquarters in Mooresville, North Carolina. This was my first event to cover for Pumps & Systems, so I had a lot to learn! Here are a just a few of the things I picked up at press day.

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