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Technical Articles - Pumps

Introduction to Centrifugal Pump Control System

This article introduces the reader to pump control systems, the types of control methods and the advantage and disadvantage of each type. A method of selecting the best-for-purpose pump control method is also discussed. Example problems are given in SI and USC units.

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Discharge Control of Centrifugal Pumps

This article focuses on the discharge control methods of controlling the flow rate of centrifugal pumps. It gives the theory of discharge control along with the advantages and disadvantages and typical applications. Many practical examples, including sizing control valves are given. Example problems are given in SI and USC units.

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Variable-Speed Control of Centrifugal Pumps

This article concentrates on the variable-speed method of controlling centrifugal pumps. The theory, advantages and disadvantages, typical applications and special considerations of this type of control method are discussed. Example problems are given in SI and USC units.

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By-Pass Control of Centrifugal Pumps

This article discusses the by-pass control method and its application to centrifugal pumps. This control method is commonly found in low-flow applications but has many other uses. Some of the topics dicussed include: advantage, disadvantage, special considerations, design issues, hydraulics, typical installation methods and sizing requirements. Example problems are given in SI and USC units.

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Centrifugal Pumps Operating in Series Configuration

This article focuses on the centrifugal pumps that are configured for series operation. This type of pump arrangement has many advantages, disadvantages and special considerations which are discussed in the article. Some of the article topics include: theory of operation, hydraulics, design issues and typical applications. Many practical example problems are included in both SI and USC units.

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Centrifugal Pumps Operating in Parallel Configuration

This article examines centrifugal pumps that are configured for parallel operation. This type of pump arrangement has many advantages, disadvantages and special considerations which are discussed in the article. Some of the article topics include: theory of operation, hydraulics, design issues and typical applications. Many practical example problems are included in both SI and USC units.

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Centrifugal Pump Performance Testing

This article discusses the various reasons for testing centrifugal pumps in both shop and field facilities. It also discusses applicable industry testing standards, theory, mathematical equations, shop test installations, data collection and interpretation of results. Several practical example problems are included in both SI and USC units.

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Centrifugal Pump NPSHR Testing

This article discusses the reasons for testing centrifugal pumps and why it is important in the design of associated facilities. It also discusses applicable industry testing standards, theory, mathematical equations, shop test installations,data collection and interpretation of results. Several practical example problems are included in both SI and USC units.

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Using NPSHA to Avoid Cavitation of Centrifugal Pumps

This article reviews many of the salient factors that contribute to the phenomenon called cavitation. Its effect on pumps and the process system are reviewed. For designers, NPSHA is an important method of avoiding this problem. Various design techniques, troubleshooting tips and recommendations are given. Several practical example problems are included in both SI and USC units.

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Understanding NPSHR and Centrifugal Pumps Cavitation

This article examines cavitation and why it occurs in centrifugal pumps. It also explains what happens to a pump performance and materials. Examples are given on how to avoid cavitation in new and existing applications. Recommendations and troubleshooting tips are given for new and existing pump systems.

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Understanding Volumetric Efficiency of Reciprocating Pumps

This article will examine volumetric efficiency of reciprocating pumps and how it affects the performance. It is especially important for some liquids in critical applications and at high operating pressures. Example problems in SI and USC units are presented that show how performance varies. Recommendations are presented for use when defining volumetric efficiency in various applications.

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Centrifugal Pump Temperature Rise Effect

This article examines why some centrifugal pumps experience rising fluid temperature issues. This is an important consideration in the design and opertion of all pumps especially those in high-energy and low specific heat applications. Design tips to help avoid the problem are given.

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