Understanding the differences between these types of pumps can mean avoiding difficulties and reliability problems.
End users should consider factors such as initial cost, pump capabilities, performance, reliability and maintenance costs when making a purchasing decision.
This pump type's unique system design requirements are often ignored or misapplied, which affects reliability and operation.
Power Pump Myths
Dispelling common misconceptions about reciprocating power pumps
PD Pump Fundamentals, Design and Applications (Part Five): Metering Pumps
Editor's Note: This is the fifth in a series of five articles based on the Hydraulic Institute's new Positive Displacement (PD) Pumps: Fundamentals, Design and Applications e-Learning course. To...
Pump Replacement Part Availability
Address this problem to avoid the possibility of future crises.The crumbling infrastructure of our roads and bridges is the hot topic in today’s political discourse. However, an even bigger problem...
Hydraulic Institute Pump FAQs July 2011
Q. I see that many pumps for pumping slurries are made of either hard metals or elastomers. Why is this and which is better?A. A large variety of metals and elastomers are used for slurry pumps...
Pumps in Solar-Cell Production
The correct selection can help keep costs down.The manufacturing of solar cells is one of the fastest growing power-generation segments in the world. Playing an enhanced role with respect to this...
The Perfect Prescription
The ancient Greek philosopher Plato is credited with coining the phrase, “Necessity is the mother of invention,” meaning that a need or problem encourages creative efforts to meet the need or...
AODD Pumps for Harsh Conditions
Product type and environment must be considered when choosing the proper pump.Webster’s Dictionary offers a number of definitions for the word harsh, including “having a coarse or uneven surface...
Energy-Saving Technology
Air-operated double-diaphragm pumps gain energy efficiency and reduce maintenance costs with innovative technology.Air-operated double-diaphragm (AODD) pumps are known for their positive attributes of...
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...
Improving Efficiency in Air Distribution Systems (ADS)
Air operated double diaphragm (AODD) pump technology was invented and introduced to the market 55 years ago. That day in 1955 when the first AODD pump began operating remains a watershed moment in...
Q. If industry guidelines for intake design are followed, when is it advisable to conduct physical model tests of intake structures?A. Industry guidelines cannot always be followed. A properly...
Hydraulic Institute Pump FAQs February 2010
Q. We have an application for pumps handling hot oil at 700 deg F. What special care should we take in selecting and installing such pumps? A. Pumps for handling oils within the range of 150 deg...
Actual NPSH Test - Reciprocating Pump and What is a Safe NPSH Margin for a Reciprocating Pump?
Actual NPSH Test-Reciprocating PumpPower pump NPSH tests are performed by holding pump speed and discharge pressure constant and varying the NPSH available in the system. Capacity remains constant for...
The Eleventh in a SeriesThe Injection of Air to Reduce Noise and DamageAs stated in an earlier article, most pumps are not suitable for handling any significant quantity of free gas. (They are just...
Q. What is an acceptable amount of residual unbalance in an impeller after it has been balanced?A. High levels of residual unbalance in rotating parts can generate high unbalance forces, resulting in...
Many pump designs fall into the positive displacement (PD) category, but, for the most part, they can be divided into two basic groups. The reciprocating group operates via pistons, plungers or...
Reciprocating Pumps vs. Multi-Stage Centrifugal Pumps
Navigating the decision to use a reciprocating pump or a multi-stage centrifugal pump
Pumps and Systems, June 2009 Editor's Note: For an online exclusive about digital dosing pumps, click here.Rising and falling pressure, as well as the need to manually recalibrate metering pumps...
Pumps and Systems, June 2009Editor's Note: Click here to read an article from the June 2009 issue about digital dosing pumps and maintaining metering pump accuracy.Digital dosing pumps can receive an...
PD Pump Fundamentals, Design and Applications (Part Four): Reciprocating Pumps
Editor's Note: This is the fourth in a series of five articles based on the Hydraulic Institute's new Positive Displacement (PD) Pumps: Fundamentals, Design and Applications e-Learning course. To...
Pumps and Systems, May 2009Q. What can be done to avoid the high-pressure differential from rupturing the diaphragm in reciprocating diaphragm pumps?A.A hydraulically coupled disc diaphragm does not...
Pumps and Systems, April 2009From aquariums to acids, amines to ammonia, atomic particle accelerators to xylene, magnetic process pumps can be found in extreme conditions. This article explores the...
Pumps and Systems, April 2009A metering pump is a positive displacement pump capable of pumping liquids at adjustable and precise flow rates. The word metering refers to the delivery of fluids at...
Pumps & Systems, August 2007Q. Is there a way of predicting the maximum operating speed for a reciprocating plunger pump when pumping a viscous liquid?A. Yes, but let's begin by setting the basic...
Pumps & Systems, March 2008It is common practice for the designer of a new centrifugal pump to model the new pump from an existing pump. Each dimension of the existing pump (except the shaft...