Rotodynamic and PD pump technologies are different in method of pressure development as well as operational characteristics. Simply stated, a rotodynamic pump uses a rotating impeller to increase velocity of a liquid and its stationary components’ direct discharge flow to convert velocity to increased pressure. A PD pump moves a set volume of liquid, and pressure is obtained as the liquid is forced through the discharge into the system.
Past Pump System Improvement columns have focused on piping systems made of one or two circuits. These systems often are found in process systems where fluid is pumped from a supply tank acting as the inlet boundary, through the system’s process elements to make the product, and then through the control elements to adjust the system’s flow rate to maintain the desired operating condition.
It is just past 10 on a Friday night when the phones of the on-call collection systems operators start ringing. It is an alarm for another pump clog at a sewage lift station—the second one in a week.
If this situation sounds familiar, it might be time to retrofit a two-shafted grinder into some lift stations. Every municipality is a candidate for a grinder retrofit, and every municipality has a problem pump station network.
The Jordan, Knauff & Company (JKC) Valve Stock Index was up 12.4 percent over the last 12 months, while the broader S&P 500 Index was up 4.5 percent. The JKC Pump Stock Index increased 9.7 percent for the same time period.1
Some historians say one of the first recorded examples of water treatment occurred more than 4,000 years ago when ancient Egyptians used almonds to coat the inside of storage vessels to help clarify river water. Around 77 A.D., the Romans became the first to use alum (a colloquial name for “hydrated potassium aluminum sulfate”) as a coagulant during water treatment. By the mid-1700s, alum was regularly being used as a coagulant in municipal water treatment activities in England.
When MPP (not his real initials), a manager for a process pump manufacturer, told me his company was working on the thrust chamber design for its new horizontal pump, I was interested. After all, millions of process pumps would benefit from improved lubricant delivery and better bearing housings. So, in early 2016, I was pleased to respond to his query.
MPP mentioned that the company’s pump speeds varied from about 1,800 revolutions per minute (rpm) to 4,200 rpm. Typical operation is at 3,600 rpm.
Today’s reverse osmosis (RO) plant design is based on diverse technological knowledge and, just as importantly, on operational experience, which can be a valuable asset for design teams. For desalination plants, it is important to explore a methodology for bridging between operation and maintenance (O&M) experience and design, while finding the process design of the future.
When Zoeller Company started planning the development of its Center for Excellence training facility at its Louisville, Kentucky, headquarters a few years ago, educating its employees and others throughout the pump-related industry was the goal. But there was another important reason driving the need to increase training opportunities.
Apaving contractor working for the City of Bakersfield, California, and Caltrans, the state’s transportation department, is managing a construction project that involves widening Central California’s main traffic corridor, State Route 99, commonly known as Highway 99. This project represents one phase of a larger scope of work included within the Thomas Roads Improvement Program (TRIP).
Pumping systems consume a significant portion of global electrical energy, accounting for nearly 20 percent of the energy used by electric motors and 25 to 50 percent of the total electrical usage in certain industrial facilities.
Ironically, pumping systems are rarely included in energy-efficiency calculations, even though pumps present such energy-savings potential. One could argue that mentioning “motor” or “variable speed drive” (VSD) is sufficient because these components indicate the greatest energy-savings opportunity in a pumping system.
Choosing the correct metering pump involves many considerations. Among them are accuracy, repeatability, chemical output, material compatibility, line pressure, control input, off-gassing of the chemical and the environment where the pump will be placed.
Even for pumps that meet the requirements for a particular application, the environment in which the pump operates can pose a significant challenge. Metering pumps often are used in wet conditions and require daily washdowns of the equipment.
Structural vibration can be a problem with most machines, particularly with vertical turbine pumps. These pumps are commonly suspended from the discharge elbow with the motor mounted above, making them difficult to stiffen and damp.
With low stiffness and damping, natural vibration frequencies in the machine operating range are inevitable, as well as reliability issues from excessive vibration. Fortunately, maintenance professionals lacking vibration analysis experience can resolve many of these issues if they understand the basics.
Pumps & Systems staff spoke with Bluefield Research President Reese Tisdale about the major trends to anticipate in 2017 and how the landscape of the water and wastewater industry will change.
As corporate citizens, businesses must evaluate their impact on the environment and assess how their product applications affect the communities in which they operate and serve. To address aging infrastructure and conserve water, a growing number of operators are bundling existing pumps and vertical turbines with more advanced solutions to drastically cut energy costs while meeting their increasing water needs.
Positive displacement (PD)pumps are chosen for some of the most challenging slurry pumping duties. Here are four important factors to consider when choosing a PD pump for mining applications.
Mining slurries tend to be abrasive with solid specific gravities of 2.65 or more and slurry specific gravities of 1.65 or greater at solids concentrations as high as 70 percent. Abrasive wear varies with velocity. End users should consider the effects of abrasive wear during pump selection.
Pumps & Systems staff spoke with David Aldrich, Product Manager, Weir Flow Control, Floway, about the major trends to anticipate in 2017 and how the landscape of the pump industry will change.
Driven by an improved environment for fixed investment spending in developed nations and by increased investment in water infrastructure in developing countries, global demand for fluid handling pumps is expected to increase 5.5 percent per year to $84 billion in 2018. According to a recent Freedonia Group report, the Asia Pacific region will account for 44 percent of new pump demand during this period, but the U.S. will remain the largest national market due to its large process manufacturing industries and water infrastructure needs.
Clogs, especially those caused by wipes, can be a major headache for wastewater treatment plants. One city in Minnesota has even filed a lawsuit against makers of “flushable” wipes. Excessive clogging issues at a wastewater treatment plant in Alabama sent the facility’s team on the hunt for a solution to this pressing maintenance issue.
Pumps & Systems staff spoke with Eric Van Gemeren, Vice President, Product Management and R&D, Flowserve, about the major trends to anticipate in 2017 and how the landscape of the pump industry and related markets will change.
Gaining an average of $200,000 a year in heating, ventilation and air-conditioning (HVAC) energy savings would be important to any organization. For Methodist Dallas Medical Center (MDMC), it means being able to direct more money toward critical—even life-saving—health services.
The Internet of Things (IoT) is changing the future of industry. Cloud-connected “things,” including all manner of equipment and devices, are becoming pervasive among consumers and business alike.
Many of these concepts are not new. Some were known by different labels in the past: supervisory control and data acquisition (SCADA) systems, telematics, machine-to-machine (M2M) communications. Another term has been coined: “Industry 4.0,” representing the Fourth Industrial Revolution.
Pumps & Systems staff spoke with Tsurumi America Managing Director Glenn Wieczorek about the major trends to anticipate in 2017 and how the landscape of the pump industry will change.
As 2017 commences, several new factors have come into play in Europe and around the world that have the potential to impact the U.S. pump industry’s business significantly in the coming years. Many of these factors relate to the ongoing political/economic instability in various parts of Europe, but in today’s interconnected global economy, innumerable current events and trends can impact the industry. While this is not an exhaustive list, end users can expect the following six factors to affect the pump marketplace.
The Jordan, Knauff & Company (JKC) Valve Stock Index was up 32.4 percent over the last 12 months, while the S&P 500 Index was up 17.5 percent. The JKC Pump Stock Index rose 36.2 percent for the same period.1