Categories: Uncategorized

Pump Basics: Affinity Laws

Law 1- Speed is directly proportional to Flow.

Law 1 means that as RPM is reduced, flow (GPM) is reduced in a linear relationship. For example, if RPM drops to 70% of the original, GPM drops to 70% of the original.

Law 2 – Head is proportional to Flow squared.

Law 2 means that as RPM is reduced, pressure (feet of head) is reduced by the square. For example, if RPM drops to 70% of the original, feet of head would drop by (70% x 70%) = 0.72 = 0.49 or 49% of the original.

Law 2 – Input power is proportional to Flow cubed.

Law 3 means that as RPM is reduced, power consumption (brake horsepower) is reduced by the cube. In the same example the power would drop to (0.7 x 0.7 x 0.7) = (0.7)3 = 0.343 or 34.3% of the original.

Recent Posts

  • Blog

How Can FRP Tanks Help in Industrial Fire Suppression

Industrial facilities depend on reliable fire suppression systems to safeguard equipment, workers, and operations. A…

3 weeks ago
  • Blog

How to Verify Your Metering Pump is Really Hitting the Target

Accurate chemical dosing is where quality, safety, and cost control meet. If your metering pump…

3 weeks ago
  • Blog

Safety First: Small Accessories That Prevent Big Chemical Incidents

Most chemical spills and dosing mishaps don’t start with a blown tank. They start with…

3 weeks ago
  • Blog

Understanding the Risks of Oversized Water Pressure Booster Pumps

Selecting the right water pressure booster pump is critical for efficient industrial and commercial operations.…

3 weeks ago
  • Blog

How Drum Pumps Simplify Fluid Management Across Industries

Efficient fluid transfer is a critical part of many industrial processes. From handling chemicals to…

3 weeks ago
  • Blog

No More 2 A.M. Call-Outs: Make Your Pump System Reliable

We know middle-of-the-night alarms are not a badge of honour. They’re a sign your pump…

2 months ago