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  • Adjustable Speed Drives as Applied to Centrifugal Pumps
    control has used valves; which increase system pressure, inherently waste energy, and generally cause the pump to operate at reduced efficiencies. d7737.qxd Adjustable Speed Drives As. Applied To Centrifugal Pumps. Application Solution. Foreword. This article is a revised edition of the original
  • Submersible Pumps vs. Self-Priming Centrifugal Pumps
    common mistake when. ins or a combination of these factors. Almost all bypass work choosing a self-priming or priming assisted pump. A function. can be accomplished with the use of centrifugal and submers-. of the pump design requires part of the 33.9 ft (14.7 in.) avail-. ible trash pumps. able
  • When to Use PD Pumps (Copyright Viking Pump, Inc.)
    . In a PD pump,. NPSHR varies as a function of flow which is. ed. determined by speed. The lower the spe. of a PD pump, the lower the NPSHR. perati. O. ng at different points on the curve. Another thing to keep in mind when compar. of pumps is that a. ing the two types. centrifugal pump does best
  • Pump Basics
    and head), depending on the structural characteristics of the pump itself and as a function of the specific system needs. The operation is simple: these pumps utilize the centrifugal effect to move the liquid and increase its pressure. A bladed wheel (impeller), the true heart of the pump, rotates within
  • Centrifugal Pumps In Tip-top Condition
    is to be proactive in a maintenance routine. This means establishing a maintenance schedule for every pump and docu- menting every maintenance occurrence, whether planned or unplanned. Liquid-terminal operators who stay ahead of the maintenance curve will reap the benefits of a facility that oper- ates
  • Case Histories: Horizontal Pumps
    particles, the customer also had clearance problems and needed to limit the installed power. The solution proposed. Horizontal centrifugal pump with mechanical seal (material of construction: PVC) instead of regenerative pumps. Thanks to the special design of the hydraulic part, a characteristic curve
  • Applying Steam Turbines For Pump Drives (.pdf)
    . curve at varying pump flows, thus reducing throttling losses. This can make the turbine a good choice for marginal NPSH. applications as it can avoid drastic speed reductions. When operating at low speed, turbines reduce radial reaction in. centrifugal pumps operating at low flows. Turbines also work
  • Pump Control with Variable Frequency Drives (.pdf)
    improvements. Curves determine centrifugal pump efficiency. In-line valves are often used to regulate flow or pressure in liquid pumping systems. The valve can be a significant source of. energy loss by causing a restriction in the flow path, thus increasing the pressure. An AC drive provides more

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