System and pump performance curves explained by The Engineering Toolbox
Video on how to read a pump curve - note uses imperial units (USA).
Single stage centrifugal pump for fresh or seawater from Apex Pumps
The pumps page on Wikipedia - introduction to different types of pumps and applications
Pump power calculator from The Engineering Toolbox
Low head horizontal propeller pump in HDPE for use in seawater from Lykkegaard A/S
Low head vertical propeller pump for seawater applications from Lykkegaard A/S. Available in HDPE.
Low head horizontal in-line propeller pump for freshwater from Lykkegaard A/S
Vertical standard propeller pumps from Lykkegaard A/S for low head freshwater applications.
Installation diagram to show the difference between Lykkegaard A/S horizontal and vertical axiel flow (propeller) pumps