Centrifugal Pumps 5.21

Introduction

• Basic Operation

Suction

DischargePumpMotor

Power End

Selection• Mechanical Energy Equation

gVk

gV

DfLh

gV

gP

whgV

gP RR

p 2222

22

2

222

1

211

g

sd

SPP

H)(31.2

E

QHSBHP g

3960

• Simplifications

Pump Selection

Hypothetical Case:

Head Required = 200 ft.

Flow Required = 300 GPM

Motor RPM = 3500

Pump Selection

Pump Selected

• 2X3-8 pump• 8 inch impeller• 26 + HP Motor• 23 + feet NPSH• 58.5% Efficient

Other Design Considerations

• Materials• Temperature• Availability of Motors• Location/Orientation• Space• Cost

Websites With Info

• www.gusher.com• www.acdpumps.com• www.gouldspumps.com• www.osmonics.com• http://web.singnet.com.sg/~acpump/

Basic Info Website:

• www.pumpline.com