Page 8 - Know and Understand Centrifugal Pumps
P. 8
Contents
Prologue xi
...
About the Authors xlll
1 Basic Pump Principles 1
Introduction 1
How do pumps work? 1
Pressure measurement 4
Atmospheric pressure (ATM) 4
Absolute pressure (psia) 4
Gauge pressure (psig) 5
Vacuum 5
Pump head 5
Specific gravity 6
Pressure measurement 6
Pressures inside the pump 7
2 NPSH, Net Positive Suction Head 12
Introduction 12
Definition of NPSHr (required) 13
Definition NPSHa (available) 14
3 Cavitation 24
Introduction 24
Vapor pressure 24
Cavitation 25
The effects of vapor pressure on pump performance 25
Cavitation: A practical discussion 26
Review for preventing cavitation 35
