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Centrifugal Pump Minute

All things relating to centrifugal pumps

Griswold's platform to provide educational resources for centrifugal pump technology and industry news.

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Centrifugal Pump Minute Posts

Welcome to the Griswold Centrifugal Pump Minute Blog

At Griswold, we’re known as the global experts in centrifugal pump technology. Personally, we enjoy being known as the industry thought leaders, and believe this reputation sums up our evolution and efforts over the past few decades. However, we also recognize that in order to build on a company legacy that dates back over 70 years, we need to better share our unmatched application knowledge and technical capabilities with the world.
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Determining available system NPSHA

In this Centrifugal Pump Minute, James Farley, Griswold Product Manager, reviews how to determine available system NPSHA for a pump that is installed and operational. Using the calculation needed to determine NPSHA, James presents example tests that will establish system performance and possible pump cavitation.
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Affinity Law RPM

In this Centrifugal Pump Minute, James Farley, Griswold Product Manager, discusses the Affinity Law formula that can be used to predict pump performance when changing speeds. Using the Griswold test lab, James provides a real-world example of the accuracy of the Affinity Law.
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Affinity Law Impeller Trim

In the first part of this two-part Centrifugal Pump Minute, James Farley, Griswold Product Manager, discusses the pump Affinity Law and how to apply it. James then uses the Affinity Law to estimate a pumps performance when the impeller diameter is changed.
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Operating at Best Efficiency Point

In this Centrifugal Pump Minute, James Farley, Griswold Product Manager, discusses best efficiency point and a good target for efficient pump operation. Using the Griswold test lab, James shows what factors affect pump efficiency, and how to optimize the performance of your pump.
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How to Measure Total Dynamic Head

In this Centrifugal Pump Minute, James Farley, Griswold Product Manager, discusses total dynamic head, and its importance when assessing a pumps performance in the field. Using the Griswold test lab, James shows the difference in measuring discharge pressure versus measuring differential pressure.
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DOE Pump Efficiency

The upcoming DOE efficiency requirements for pumps will be disruptive to the pump industry and it is important for manufacturers and customers to become prepared. In this post, we are not covering all aspects of the regulation, but highlighting key features and providing good references for gaining a deeper understanding of the requirements.
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Pump Inspection: ANSI Centrifugal Pump

In this Centrifugal Pump Minute, James Farley, Griswold Product Manager, reviews how to perform proper pump inspection for a typical ANSI centrifugal pump. Using the Griswold test lab, James shows the steps and wear points that should be noted during the inspection.
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Vibration: ANSI Centrifugal Pump

In this Centrifugal Pump Minute, James Farley, Griswold Product Manager, discusses how high-level vibration can be extremely damaging to the pump, as well as what components are most vulnerable to vibration damage. James also covers detection technology and ways to better analyze vibration effects on the pump.
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Alignment: ANSI Centrifugal Pump

In this Centrifugal Pump Minute, James Farley, Griswold Product Manager, illustrates how to properly align the couplings on a centrifugal pump. Proper coupling alignment is critical to minimizing pump vibration and maintaining reliable performance.
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