Q. What is NPSH3, and what are the methods for determining the NPSH3 of a rotodynamic submersible pump? A. NPSH3 is the net positive suction head available to a pump under test at a constant rate...
The positive displacement technology handles backpressure fluctuations, cavitation and air entrainment.
Q. What dynamic analysis considerations are recommended for the petroleum market? A. End users should evaluate their need for dynamic analysis by considering the level of proven field experience...
Comprehensive testing revealed unexpected relationships.
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....
Many options are available to meet industry and application requirements.
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...
Q. What are some factors to consider when conducting a life-cycle cost evaluation for a sealless rotary pump? A. There is a substantial first-cost premium for sealless rotary pumps. Depending on...
Q. What information is available regarding NPIPA and NPIPR for rotary pumps? A. Net positive inlet pressure available (NPIPA) is the algebraic sum of the inlet and barometric pressure minus the...
The efficient reduction and removal of solids is critical in food waste applications.
Wastewater Debris Disposal Options
Strange things can enter municipal wastewater processing plants. While the bulk of the volume is water, the main challenge is what is carried along with it. As the influent enters the plant, the first...
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...
Three screw pumps successfully pump palm oil for power generation in HawaiiOpen a magazine or turn on the television today and renewable or green energy will likely be a topic of discussion. The...
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 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...
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...
SLP Pump RangeInnovationIntroduced in April 2010, the SLP25i is a positive displacement vane pump that can be used on a variety of industrial and chemical fluids. This pump is sealless, which means...
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...