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Centrifugal Pump Training, Course #2 - System Head Curves and NPSH

1.0

Drinking Water and Wastewater

360water, Inc.

Saylor Frye

saylor@360water.com

614-294-3600 Ext.

Partner Website

This is the second of four courses devoted to the Centrifugal Pump Hydraulics, Application and Troubleshooting Seminar. In this course we will briefly introduce the workings of a pump. We will also go over system hydraulics, such as calculating the system head curve, and discuss net positive suction head and how it is calculated.

Basic thru Intermediate

I. Abstract II. Objectives III. Keywords & Definitions IV. Introduction V. System Hydraulics A. System Hydraulics or System Head Curve B. How is a System Head Curve Calculated? For practice, work through the example: Resources provided: Fitting Loss in Equivalent Length of Straight Pipe (in feet). Friction Loss of Water in Feet per 100 Ft. Length of Pipe. Based on Hazen-Williams Formula Using Constant 100. Sizes of Standard Pipe in Inches. Hazen-Williams Friction Factor C. C. System Head Curves 1. Friction losses are determined by: a. Rate of flow. b. Size of pipes, valves, and fittings on the suction and the discharge. c. Type and condition of pipe, valves, and fittings on the suction and the discharge. d. Length of the actual pipe and the equivalent length of valves and fittings on the suction and the discharge. 2. system head curve and the pump performance curve: a. Where the pump will operate on its curve. b. What the pump efficiency will be. c. What the horsepower required will be

Water and wastewater facility personnel.

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