The positive displacement technology handles backpressure fluctuations, cavitation and air entrainment.
Q. Can rotary type pumps be used to pump slurries? If so, should users be aware of any special precautions? A. Rotary pumps may be used to transfer slurries when the application dictates....
Q.What are “nonclog pumps,” and in what applications are they used? Figure 1. Dry pit pump – overhung flexibly coupled vertical end suction A. “Nonclog pumps” are rotodynamic...
Q. What are some ways to monitor the power used by a rotary pump? A. Instrumentation and systems can be used, such as: Torque meter—The most direct way to monitor power is a torque meter with...
Q. We recently purchased several magnetically driven rotary pumps for our process and want to know if we need to be aware of any special operational considerations. A. The operation of magnetically...
Q. What information is available regarding bearing minimum loads for pumps? A. All rolling element bearings require a minimum applied load. This ensures that normal elasto-hydrodynamic operation...
Prepare for the 4th Edition of API 682
This comprehensive international standard for mechanical seal and system use has many important changes.After more than five years of planning, the American Petroleum Institute (API) is preparing to...
Pumps and Systems, January 2007 The Water Industry is a $90 to $100 billion collection of businesses engaged in the treatment and delivery of water. This age-old industry has recently become more...
Executive SummaryWhen assessing the vast chemical industry, it is usually not advisable to deal in generalities. However, as a base for the market's examination, Beth Beloof and Marianne Lines,...
Pumps & Systems, April 2008 Biofuel production is one of the fastest growing sectors of the energy industry. To reduce our dependence on finite energy sources such as petroleum fuels and decrease...
Multiple screw pump performance specifications are shown in the table below.Pump TypeFlow Rate GPMPressure Range PSIViscosity Range cStTwin Screw25 - 5,50050 - 1,500Gas - 1,000,000Three Screw1 -...
Pumps & Systems, June 2008Click here for "Focus on Fundamentals" Part 1, Part 2,  Part 4 and Part 5. In the April and May 2008 issues, we looked at centrifugal pumps....
Pumps and Systems, July 2009Organizations affected by regulatory requirements to remove lead from pipes, faucets and plumbing fixtures are likely well-down the path of investigating material options...
Hydraulic Institute Pump FAQs June 2011
Q. When purchasing rotodynamic (centrifugal or vertical) pumps, how can we estimate if the efficiency of the proposed design is the best to be expected for our application?A. The Hydraulic Institute...
The Challenge"Inaction is the riskiest response to the uncertainties of an economic crisis. But rash or scattershot action can be nearly as damaging."So begins "Seize Advantage in a Downturn,"...
Non-Metallic Mag Drive Pumps: Great Equipment for Aggressive Fluids
Non-metallic magnetic driven gear pump technology improves equipment life and maintenance costs for metering and transfer applications.Finding an efficient and economically feasible way to transfer...
Pumps & Systems, November 2007Rotary positive displacement (PD) pumps are not well understood by many specifying engineers and users and are sometimes misapplied, incorrectly specified or simply...
Pumps & Systems, February 2008 Self-timing, two-piece timing gears have changed the timing procedure and increased the life cycle of twin screw pumps. Old Technology Versus New Technology In...
Pumps & Systems, June 2008The rotary lobe pump belongs to the positive displacement pump family. It is a dual shaft pump design with external timing gears, allowing two intermeshing rotors to...
Pumps & Systems, April 2008Called the "fastest-growing alternative fuel" in the United States by the Department of Energy, biodiesel continues to play an increasingly significant role in the...
Almost all centrifugal and rotary pumps require a sealing system to provide sealing integrity of the drive shafts carrying the impellers and protect against pumped fluid leakage and the environment...
Hydraulic Institute Pump FAQs August 2010
Q. What is the preferred method for starting reciprocating power pumps?A. Starting a reciprocating pump with a closed discharge valve is naturally difficult due to the high torque required to overcome...
High energy prices pose an unprecedented profit-robbing threat to every manufacturing operation, large or small. Left unmanaged and unchecked, rising energy expenditures can erode a company's...
A power company in the Atlanta, Ga., area wanted to replace its older, coal-fired electric generating units with gas turbine, combined cycle technology to reduce nitrogen oxide (NOx), sulfur dioxide...
Last month, we looked at tight versus loose pump performance. This month, we will consider additional factors that influence pump performance. The Effects of Pump Component Wear To further...
Technical professionals understand a variety of fluid-transfer performance concepts. The principles have much to do with evaluating if an individual pump will succeed in accomplishing its...
Transporting crude oil has always presented unique fluid-handling challenges. For example, pipelines often traverse remote territory in harsh environments, so they require pumping solutions capable of...
Without question, liquid storage terminals play an integral part in the ongoing success and relevance of a wide array of industries worldwide. They serve a vital role in the global economy as transfer...
Metering Pump Application and SelectionA wide range of metering pumps has been developed to fit the diverse applications in process engineering. Before selecting a metering pump, consider the...