screw-centrifugal pump Articles

  • Screw Pumps Stockholm - Case Study

    The order for renovating three screw pumps is not remarkable, but the location of Danviken Pump station however is unique: in a cave in the middle of the city of Stockholm, near the Royal Palace and City Hall. Landustrie installed three screw pumps with a diameter of 2.60 meter. Screw length 9.9 m - capacity 9720 m3/h - power 160 kW. The screw pumps are supplied with eco-friendy ...


    By Landustrie Sneek BV

  • Submersible Pumps vs. Self-Priming Centrifugal Pumps

    When selecting a centrifugal pump for bypass work, the first consideration should be NPSHR by the pump. Neglecting the NPSHR of the pump is the single most common mistake when choosing a self-priming or priming assisted pump. A function of the pump design requires part of the 33.9 ft (14.7 in.) available as further defined in this article. A centrifugal, and in a way submersibles, require part ...


    By Griffin Dewatering

  • Flexibility is key: Screw pumps in oil-supply systems

    Flender AG, a subsidiary of Siemens AG, has been using screw pumps from Allweiler AG for more than 25 years. Flender’s plant in Voerde, Germany (in the industrialized Ruhr region) manufactures gear units for extruder systems and vertical mills. The pumps supply the gear units with oil that is needed both for lubrication and for cooling. Large vertical mills require as much as 2000 l/min in ...


    By ALLWEILER GmbH

  • The Versatility of Hydraulic Submersible Pumps

    Hydraulic submersible pumps offer flexibility and performance When determining a pump for an application, there are a number of factors to consider. Hydraulic submersible pumps are an option and give the added benefit of run dry capability, especially when electric powered pumps are of concern due to potential electrical hazards or other reasons, or diesel driven centrifugal pumps ...


    By Griffin Dewatering

  • What is a slurry pump

    Talking about slurry pump, we see slurry first then next is pump, so let’s start with slurry. Slurry is a kind of liquid with solids, mostly its specific gravities greater than 1. The solids size may vary from a few micrometers, often referred to as microns, up to hundreds of millimeters and the solids may settle below a ...


  • 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

  • Pumps for bitumen and wax

    Moving and processing petroleum-based products involves special challenges. Pumps used in this activity must be capable of moving liquids that have very good lubricating properties as well as liquids containing abrasive components. Depending on the particular process step, high discharge pressure or high capacity may be needed. Finally, viscosity of the pumped liquid can vary from finished, ...


    By ALLWEILER GmbH

  • Understanding Pump Cavitation

    Cavitation is a major problem in the chemical industry because it affects a basic tool, the centrifugal pump. A sudden increase in the velocity of the pumped liquid reduces the inlet pressure, sometimes below the vapor pressure.The result is formation of gas and bubbles. Detecting the signs of cavitation, and correctly identifying and understanding the type of cavitation present, can help an ...

  • Pump Performance Checklist

    Keeping your pump in shape will help reduce costs and boost profits! Cut fuel consumption, reduce replacement parts costs and minimize pumping time on every job! A PUMP THAT LETS YOU DOWN when you need it most causes obvious losses of time and money. Not so obvious, but every bit as costly, are losses you can incur with pumps that operate at less-than-peak efficiency. A pump ...


    By Gorman-Rupp Co.

  • Horsepower on the pump curve

    Now that the head capacity relationship along the X and Y axes of the pump curve has been established in Part 1 of this series, the pump curve can be used to determine the amount of horsepower required to meet the head and capacity requirements for the job. Horsepower is a unit of power equal to 550 foot pounds per second or 746 watts. Water horsepower is the minimum power ...

  • Picking the Perfect Pump

    By John Amundsen, District Manager The Gorman–Rupp Company Pumps and pumping systems are like unsung heroes of modern society – quickly and quietly transporting vital water supplies, chemicals and waste to and from locations, which rely upon their consistent, reliable operation. In fact, pumps and pumping systems are one of those entities that aren't ...


    By Gorman-Rupp Co.

  • Pumping at Subzero Temperatures

    Pumping of cryogenic (low-temperature) products is important for many applications, especially in the field of liquefied natural gas (LNG). The Sulzer J-unit is a special sealing system for cryogenic pumps. It was invented more than 60 years ago. The evolution of the J-unit design since then has been impressive and has now resulted in a recently filed patent application by Sulzer. ...


    By Sulzer

  • slurry pump impeller

    Impeller is a rotating component of a centrifugal pump, which transfers energy from the motor that drives the pump to the fluid being pumped by accelerating the fluid outwards from the center of rotation. ...


  • Pumps in lubricant production

    A major business segment at Hermann Bantleon GmbH is the development, production, and sales of lubricants. At its plant in Ulm, Germany, this company starts with high-quality base oils and produces both universal and customized lubricants according to its own formulas. Customized products are often the best way to meet special requirements in cutting and non-cutting production processes. They can ...


    By ALLWEILER GmbH

  • Less and More : Why You Should Pump Slurries with a Peristaltic Pump

    LESS WATER Peristaltic Pumps Use Less Water Hose pumps can circulate slurry SGs of 1.6 to 1.8 or up to 80% solid content. The traditional centrifugal pump loses efficiency when the slurry SG reaches 1.3 or 30% solids. With this limitation, slurry pumps have significant process water demands : on a plant processing 70 tonnes of ore per hour, every time a hose pump replaces a ...

  • Separation principle of decanting centrifuge

    KOSUN DC series decanting centrifuge is used in separating suspension of solids phase with particle diameter(d≥2μm) for drilling mud and fluids handling. Ruggedly built for oilfield and industrial services, it is especially effective in environmentally sensitive areas. It delivers high fluid-recovery rates and ...


  • Progressing cavity pumps for pumping chemically aggressive liquids during biodiesel production

    Progressing cavity pumps reflect an established design with decades of usage in many industries and applications. Pumps of this type embody highly mature technical designs. For many years, improvements and innovations have been at the margins. Examples of design improvements include the 2/3-screw geometry, which is more economical than the 1/2-screw geometry that had been used exclusively for ...


    By ALLWEILER GmbH

  • Peristaltic pumps for moving filtration water

    The Eversburg sewage treatment plant is designed to serve 250,000 population equivalents and is one of three plants operated by the city of Osnabrück in northern Germany. But in 2005, its actual load was closer to 309,000 population equivalents (COD 80 mg/l), pushing the nitrogen input level above the plant's capabilities. To deal with this situation, engineer Peter Sikora organized a team ...


    By ALLWEILER GmbH

  • Verderflex peristaltic pumps replaces mag drive pumps in water treatment

    Verderflex provided a cost effective solution to a Swiss airport that had been experiencing significant problems with their water softening treatment. The local water supply required treatment to prevent scaling in the pipework.  The Challenge The existing treatment system required a salt solution to be dosed from a storage tank close to the pumps ...

  • Pumps are the heart of heat-transfer plants

    Manufacturers in a variety of industries depend on heat-transfer plants to heat or cool their machines and apparatus. German firm heat11 GmbH & Co. KG specializes in heat-transfer plants of virtually all types. The chemical industry uses their installations for controlling the temperature of reactors and during the production of color pigments and liquid crystals. In the plastics industry, ...


    By ALLWEILER GmbH

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