The term water supply pump refers to all centrifugal pumps which transport drinking or service water either directly to a supply network or through long-distance pipes to a supply area.

Requirements to be met by water supply pumps:

• High efficiency (continuous operation)
• Reliable bearing arrangement which does not impair the water quality
• Low noise level

Various types of pumps are used depending on the flow rate (Q), head  (H) and installation conditions.

Types of pumps and their operating ranges

• Submersible borehole pumps are installed in wells. They pump the water directly to the network if no water treatment is required: Q up to 3,000 m 3 /h, H up to 1,400 m
• Vertical, wet-installed deep-well turbine pumps (see Vertical pump; see Wet well installation): Q up to 2,800 m 3 /h, H up to 160 m
• Vertical, wet-installed, multistage tubular casing pumps  (Mixed flow pump; see Multistage pump): Q 800 to 30,000 m 3 /h, H up
  to 140 m
• Single-stage, single-entry volute casing pumps: Q up to 36,000 m 3 /h, H up to 140 m
• Single-stage, single-entry volute casing pumps with diffuser: Q = 500 to 10,000 m 3 /h, H up to 210 m
• Multistage pumps: Q = 20 to 500 m3/h, H up to 500 m; Q = 500 to 3,500 m 3 /h, H up to 350 m
• Double-suction, single-stage volute casing pumps (see Double-suction pump): Q = 100 to 30,000 m 3 /h, H up to 500 m
• Double-suction, single-stage volute casing pumps with diffuser: Q = 800 to 20,000 m 3 /h, H up to 700 m