Water chemical compatibility and electrical interference are two major challenges for control systems. Two major sources of fresh water can limit the performance of the control system.

Monitoring motor-pump combinations for signs of impending problems provides useful information to prevent pump failure and minimize costly downtime. Since rotating machines exhibit recognizable failure modes that are revealed by their vibrations, analysis of vibration data can identify changing conditions and diagnose an evolving problem. This can be the difference between a plant or mill continuing to operate or having to shut down for unscheduled repairs.

While driving a car with the gas pedal to the floor and then controlling your speed using the brake is obviously inefficient, many facilities use the approach for pump control. Flow control with throt­tling or restrictive devices sacrifices energy efficiency and results in unnecessary costs. However, with an understanding of basic principles, an analysis of the specific application, information about available control solutions and evaluation of technologically advanced equipment, facilities can make a quantum leap in improving the efficiency and econ­omy of pumping operations. pump efficiency

Pressure gauges are an important indicator of whether a system or component is operating correctly. Pressure gauges generally require little to no maintenance, other than periodic calibration. However, if gauges require minimal maintenance, why do some seem to continually wear out?

Explore best practices for securing SCADA systems in remote sites. This article addresses threats and corresponding implementation measures with a focus on SCADA RTU installations and the processes they monitor and control.

Even though control technology has become an integral part of many pumping systems, over half of our readers have not expressed much interest in pump controls. I think I know why - today's controls are simply not as intuitively understandable as they once were. Who wants to read about the advantages of PID control without a basic understanding of P, I, and D itself?

Industry analysts predict that in the near future, most motors will be controlled by variable frequency drives. Here are the reasons why.

Sensors and automation passively participate in our everyday lives to improve comfort, add safety and reliability, and increase the efficiency of needed products and services.

Active Front End (AFE) drives use two power sections. An active rectifier is used to minimize the amount of harmonic distortion reflected to the power grid by drawing nearly sinusoidal current from the power grid. Standard 6-pulse rectifiers used in most drives create harmonics (e.g.5th, 7th, etc.) that can generate anywhere from 30 to 100 percent current distortion. The active rectifier used in the AFE drive creates cancelling harmonics that effectively eliminate those that would be created in a standard 6-pulse drive.

Soft starters and VFDs are useful for extending equipment life in HVAC applications.

Understanding technology capabilities and application requirements is important when selecting a wireless technology for an application. The reasons to choose wireless include reduced installation costs, installation and deployment flexibility and the ability to address new applications. Before selecting wireless, first ensure the bandwidth available with wireless meets the application requirements.

The Detroit Water and Sewerage Department (DWSD), a municipally owned utility, provides roughly four million residents in southeastern Michigan with an average of 710 million gallons of water per day.

As pump users, we often have to deal with fuzzy concepts, such as: What is low flow? When are vibration levels too high? When is suction specific speed value too high? When is a pump's energy level high?

The second part of this three-part series explores the types of protection applied to specific equipment installed at water and wastewater facilities and some typical criteria used to develop protective settings.

Vertically mounted pumps can resonate as a total structure in a "rocking" mode, as shown in Figures 1 and 2 below. This is one of the toughest unsolved vibration problems at several plants.

In my experience, there are three types of maintenance philosophy regarding vibration programs: No philosophy at all, utmost attention with zeal, attention to particularly problematic units

When the City of Delaware, Ohio, expanded its wastewater treatment plant, it looked to increase more than just capacity. It also wanted to increase its efficiency and automation capabilities to benefit the plant's operators and taxpayers.

Paddle wheel flow sensors not only continue to remain strong in industrial applications, their use is growing. Because these devices offer the lowest cost per sensing point of any flow measurement technology, users can save significantly on purchase, installation and maintenance costs.

Interpretation of equipment clues can help diagnose problems before failure occurs

Under an Energy Conservation Performance Program, Miami-Dade County commissioned a study to evaluate potential capital improvement projects fully funded from the projected savings in energy consumption and/or operating and maintenance costs. Through this program, the cost of new equipment is financed through energy and/or other realized operational cost savings. The capital funding otherwise required to replace existing mechanical systems is avoided, and those funds can then become available for other County needs.

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