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This waterhammer tutorial looks at the subject from a different perspective than does my earlier one. Part 2 looks the the causes and variables. Systems magazine articles for additional reading. This tutorial takes a look at cavitation from a different perspective. It expands upon my original turoral “Cavitation – A Largely Misunderstood Phenomenon.
Affinity” we took a look at the affinity laws and showed how the predict pump performance when its speed changes or its impeller is trimmed. This tutorial goes a step further and describes the effect of these changes on pump efficiency. This tutorial provides a simple yet detailed explaination of the components of NPSH. It also discusses their relationship to cavitation in a centrifugal pump. Systems magazine article for additional reading. Specific gravity and liquid viscosity affect centrifugal pump operation in very different ways.
This two part tutorial discusses the impact of each. Part 1 covers SG while Part 2 looks at Viscosity. The physics of liquid friction is still pretty sketchy. Unlike solid friction, velocity and surface area are major considerations. This tutorial compares these two forms of friction and goes into some detail about each. It is all about the velocity added by a pump’s impeller. This tutorial dispells this myth and explains the relationship of velocity to the three affinity laws.