VFD design Articles

  • How to maintain a VFD

    Many of the VFDs used by the water and wastewater industry are approaching 20 years old. With careful maintenance throughout this period, the drives will still be giving good service. But there comes a point in any drive's life cycle where the decision has to be taken: do you replace, upgrade or retrofit? But which is best and when is each relevant? This article explains the choices and the ...


    By VFD Manufacturers

  • VFD for pumping systems

    Pumping systems account for nearly 20% of the world's electrical energy usage. In some process plants, the VFD for pumps and fans together account for between 50% and 80% of the total electricity used. Very rarely have I come across pumps operating with fully open discharge valves. The same is the case for fans with dampers. ...


    By Variable Frequency Drives

  • CSV’s replace VFD’s case study

    Variable Frequency Drives or VFD’s do not save energy! It is a myth that VFD’s save energy. The average person and even many “experts” may think it completely logical that reducing the RPM of a pump also reduces the amount of power used. This is Absolutely False!! A VFD always causes more energy to be used per gallon produced. The Cycle Stop Valve or CSV is ...


    By Cycle Stop Valves, Inc.

  • Dredge Pumping Systems Improve with VFD Motor Controls

    Submitted by Dave Stoltenberg, Dredge Rental Specialist, SRS Crisafulli Pumps and Systems recently published an article by Christopher Jaszczolt titled “VFDs Improve Motor and Pump Control”.   The article discussed current applications of variable frequency driven (VFD) motor controls as an excellent method ...


    By SRS Crisafulli, Inc.

  • Industrial Screw Conveyors: Design and Use

    Industrial screw conveyors are used by many industries such as water treatment plants, food and chemical processors, biofuel, agricultural, wood pulp, and more. They are used to efficiently convey materials, frequently to or from hoppers and bins. Thermal screw conveyors are also extremely useful in many industries. The ability to heat or chill the conveyed material can bring big improvement for ...

  • Cycle Stop Valves verses Constant Pressure Pumps case study

    The newest innovation in pump control technology is "constant pressure valves". The name "constant pressure valve" was coined several years ago by Cycle Stop Valves or CSV. Some people would like you to believe that variable speed pumps, VFD, or so called "constant pressure pumps" are the most modern pump control system. In reality VFD was introduced in 1968, and because of the laws of physics, ...


    By Cycle Stop Valves, Inc.

  • Expanding Global Growth for a Textile Machinery Manufacturer

    Matrix® AP Harmonic Filters provided the valuable solution to meet global THID performance standards. A textile machinery manufacturer looking to expand its operations internationally discovered a problem with harmonic distortion in their systems. The use of Variable Frequency Drives (VFDs) within their machines improved efficiency and precision by controlling motor speeds ...


    By MTE Corporation

  • Case study - World`s largest remediation site

    Overview Hong Kong's Kai Tak Airport, the world's busiest airport in 1997, became the world's largest remediation site once it was closed. When the airport was decommissioned in 1999 in favor of the new Chek Lap Kok Airport, the government planned to rapidly clean up the site for commercial and residential development. After many years of soil penetration by various ...

  • 25th Anniversary Product Release

    This year, KEMTRON Technologies is proud to celebrate 25 years of business. From the very beginning, KEMTRON has been providing quality, sophisticated solids control and waste management equipment to the oil and gas industry. This remarkable benchmark has been made possible by our unwavering commitment to our customers through offering durable value, now. For 2014, after intensive ...


    By Elgin Separation Solutions

  • Screening options - You may never be able to make the wrong choice again!

    Ready for release this year, Arlat will be adding a new series of screens to their product line. Built around the popular ‘TS’ design, the Multi-screen will provide options for engineers and operators at the beginning of the project as well as anytime in the future. Designers and Engineers that are not willing to ‘mess with success’ can use a traditional bar screen along with the MR belt, which ...

  • Peach Processing Wastewater Treatment

    A major fresh pack operation of peaches and nectarines needed a screening system to remove the labels and peach fuzz from their wash water before it was pumped from the pond for irrigation use. Flow to the pond is a steady flow of 50 gpm, rising to 600 gpm during periodic draining of the peach coolers and washing systems. The water is a combination of wash water, labels and fuzz from the fruit, ...


    By Integrated Engineers Inc.

  • Implementation of an Innovative, Severe Duty, Grit Removal System at the Blue Plains Advanced Wastewater Treatment Plant in Washington, D.C.

    The District of Columbia Water and Sewer Authority’s Blue Plains Advanced Wastewater Treatment Plant has headworks facilities capable of treating an average daily design flow of 370 million gallons per day (mgd) and a design peak flow of over 1.0 billion gallons per day (1,000 mgd). The facilities are prone to very heavy grit loads during wet weather events, and the facilities are forced to ...

  • Open Loop Geo Systems

    Open Loop Geo Systems Homeowner Info Video http://www.cyclestopvalves.com/video/commercial-dsl.wmv Pside-Kick video ...


    By Cycle Stop Valves, Inc.

  • A novel atmospheric freeze-drying system using a vortex tube and multimode heat supply

    This article presents results of an experimental study of (AFD); atmospheric freeze-drying which uses a vortex tube to produce low temperature air, as an alternative to vacuum freeze-drying (VFD). An experimental setup was designed and built to permit simultaneous application of convection, conduction and radiation heat input to the drying material without heating it above the freezing point of ...


    By Inderscience Publishers

  • Lindsay Irrigation advances Watertronics AG Pump Stations case Study

    When AJ Ochoa, a fourth generation Othello, Wash. farmer pushed one button to start his new Watertronics® agricultural pump station, he became one of the first irrigators in the world to reap the benefits of a fully integrated pump and center pivot water control package. Even more important to Ochoa, he began realizing immediate and substantial reductions in energy, water and labor costs. ...


    By Lindsay Corporation

  • When Things Get Tight

    A crude oil transfer pump on an offshore platform in Malaysia needed to be rerated to meet changed working conditions. Sulzer found a retrofit solution that complied with the challenging space and time constraints. Low oil prices put more pressure on oil producers around the world to extend the life of mature oil fields and to debottleneck existing platforms. This has led to a rise in the ...


    By Sulzer Ltd.

  • Tamworth City wastewater reuse project case study

    Lindsay Pivots and Pumps Provide for City’s Wastewater Needs Summary How do you successfully complete one of the largest wastewater treatment projects of its kind in Australia? With a full arsenal of Lindsay products, including pivots, pumps and remote telemetry. With the city’s population expected to grow to nearly 50,000 by 2020, the ...


    By Lindsay Corporation

  • Honeycat cleans up VOC emissions from textile coating process - Case Study

    Product: Honeycat, Catalytic Oxidation System Application: Textile, Resin coating Customer: Permali, Ltd Site: Gloucester, UK Flowrate: 15,000, Nm3 hr-1 VOCs: Methyl,Cellosolve, Acetone, MEK & IMS Concentration: 0,to 8 ...


    By AirProtekt Limited

  • Pumping Wastewater into Existing Pressure Sewer

    Romtec Utilities designs, manufactures, and supplies pumping systems for many different applications. Our systems include all structural, all mechanical, all electrical, and all communications systems in a single purchase. Many of our systems are designed and supplied to handle sewage and wastewater flows in a lift station design. In many scenarios, these lift stations ...


    By Romtec Utilities Inc.

  • LonWorks delivers savings on sunset Blvd case study

    The Building The Sunset Millennium building is in the heart of the renowned, billboard saturated, Sunset Blvd nucleus of trendy restaurants and exclusive nightclubs. The lower levels of the building house a 4 story underground parking garage that can hold up to 1000 vehicles. The garage sees traffic 24 hours a day, 7 day a week. Issue When the building was ...

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