Pumps

Latest Pumps Articles

During the past 30 years, sine pumps have developed to meet the food and beverage industry need for a pump that is simpler, gentler and more reliable than traditional positive displacement pumps. Sine pumps are characterized by a sinusoidal rotor that creates four separate and symmetrical pumping chambers within the pump. The undulating action of the turning rotor gently transfers product.

Every raisin of the 50,000 tons of raisins processed annually at the National Raisin Co. plant in California undergoes a 35-cyle cleaning process and a thorough quality inspection before shipment. During this rigorous process, between 60,000 and 80,000 gallons of wastewater are generated each day, mostly from washing dust, sugar and other contaminants away from the raisins.

Q. What are some effects of a gas and liquid mixture being carried through a rotodynamic pump?

We have all been on the receiving end of a sales pitch that emphasized the concept of value to the customer. Although we know that value is important, few can succinctly define it and fewer still can quantify it. As a result, business executives need a more disciplined and innovative approach to defining and determining business value so that they can make intelligent business decisions.

The Jordan, Knauff & Company (JKC) Valve Stock Index was down 5.6 percent during the last 12 months, while the broader S&P 500 Index was up 14.8 percent. The JKC Pump Stock Index decreased 8 percent for the same time period.1

Previous “Pump System Improvement” columns covered the assessment of simple systems with a single load. The system discussed in this column has multiple loads. Figure 1 is a schematic of a piping system under evaluation.

Despite its name, pump specific speed (NS) does not have much to do with the actual speed of a pump. While the rpm is included in the formula, the calculation’s main purpose is to establish the impeller’s shape and contour and to link this to other pump parameters—such as head rise to shutoff or the maximum achievable theoretical efficiency.

During the next few years, American pump manufacturers will face several challenges in their dealings with the eurozone. The first challenge relates to exchange rates, and the second relates to the viability of the eurozone—and European Union (EU) as a whole—as an economic bloc.

Major pump companies are making key changes in personnel, and they are starting at the top.

Part One of this series (Pumps & Systems, November 2014) explained the general concept of slip in centrifugal impellers. This part will discuss how split vanes or alternating primary and secondary vanes can control slip in slurry pumps.

TOPIC SPONSOR

Columns

For those of you old enough to remember Lawrence Welk, you’ll notice that the title of this brief column is the final quote from his show’s closing song. I am still a loyal fan of his reruns today.

Despite its name, pump specific speed (NS) does not have much to do with the actual speed of a pump.

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

Blogs

Today marks the final day of the 2015 International Water Summit (IWS), a gathering of water and sustainability experts from around the globe. Thousands gathered in Abu Dhabi this week to discover solutions to problems such as water scarcity and efficiency.

Previous “Pump System Improvement” columns covered the assessment of simple systems with a single load. The system discussed in this column has multiple loads. Figure 1 is a schematic of a piping system under evaluation.

Cahaba Media Group

See also:

Upstream Pumping

© Copyright Cahaba Media Group 2015. All Rights Reserved. Privacy Policy