Variable Speed or Impeller Trim?
The simplest way to change pump flow is to throttle the discharge by the valve. Even in this situation, the impeller diameter cannot be arbitrarily chosen. The diameter should be selected to ensure...
Improve Control Valve Performance for Greater Process Reliability
A valve positioner positions the valve in response to input signals from the process control system (or programmable logic controller). Most systems currently use either analog 4-20 mA or digital...
Structural Resonance Problems on Vertical Pumps
Mechanical resonance is the tendency of a mechanical system to absorb more energy when the frequency of its oscillations (external excitation source) matches the system's natural frequency of...
Decentralized Distributed Systems as Alternative Treatment Options
A city's wastewater treatment infrastructure is part of the groundwork of an entire community's organization and is one of a community's most costly endeavors. Using a centralized system often does...
Flash Steam Recovery Using Condensate Tank Vent Condensers
With today’s energy prices and the need to reduce emissions, a plant cannot allow its steam/condensate systems to vent flash steam to the atmosphere.Depending on the installation costs, plants will...
AC Power Part 1: AC Versus DC
First of Three PartsThis three part primer is a basic introduction to AC power for those in the pump industry who need a place to start. It will also provide several web references to access if you...
Electric Motor Efficiency Regulations Part One
Integral Hp AC motors Between 1-500 hpThe Energy Independence and Security Act of 2007 (EISA), which restates and broadens the definition of General Purpose Electric Motors, goes into effect on...
Emergence of Intelligent Pumping
Traditional control techniques examine the "running" status and the "not ready" status of the control circuit. While this method has served well for decades, it does have limitations. First,...
While it is valid to state that energy efficiency is defined as the same level of production achieved at an overall lower energy cost, it is equally important for today's machine builders and...
Energy Savings with the Correct Duty Point
 With continuously increasing energy costs, pump manufacturers must provide energy efficient solutions for fluid transfer. Besides hydraulically optimizing current technology, manufacturers are...
Holistic Pump System Designs
Holistic pump system designs optimize system efficiency and life cycle performance.A pump system that is well-designed not only maximizes overall system efficiency, it can also be adapted to changing...
Hydraulic Institute Pumps FAQs June 2010
Balancing Pump Impellers; High Efficiency Pumps; Boiler Feed Booster PumpsA. Pump impellers are typically balanced in accordance with ISO 1940 balance quality grade G6.3 or better (see Figure B.2)....
Internal Joint Restraint for Municipal Applications
Corrosive, aggressive soil had eaten through a 35 year old ductile iron pipeline in the Port of Tampa area, causing a multitude of leaks that could not be repaired. Replacing the rotten pipe with more...
New Advances in Variable Frequency Drives
Variable frequency drive technology is more efficient and accurate, which leads to increased energy savings. Advancements in capacitors and direct current (DC) link reactors, IGBTs, heat management,...
What Gasket Properties Are Most Important, and How Do I Use Them?
This article will review properties from two basic tests, how they are determined and what value they have in selection of sheet-gasket material for an application. What Do These Properties Reveal?The...
The 15th Conference of the Parties under the United Nations Framework Convention on Climate Change (COP 15) recently brought new attention to how global climate change is rapidly reshaping the...
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...