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Water - Suction Flow Velocity

Recommended water flow velocities on suction sides of pumps

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Capacity problems, cavitation and high power consumption in pumps, are often results of the conditions on the suction side.

In general - as a rule of thumb - keep the suction fluid flow speed below the following values:

Pipe bore		Water Suction Velocity
inches	mm	m/s	ft/s
1	25	0.5	1.5
2	50	0.5	1.6
3	75	0.5	1.7
4	100	0.55	1.8
6	150	0.6	2
8	200	0.75	2.5
10	250	0.9	3
12	300	1.4	4.5

More about NPSH and suction problems:

Cavitations and NPSH - An introduction to cavitation and Net Positive Suction Head NPSH

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Related Topics

Fluid Flow and Pressure Drop - Pipe lines - fluid flow and pressure loss - water, sewer, steel pipes, pvc pipes, copper tubes and more
Water Systems - Hot and cold water service systems - design properties, capacities, sizing and more
Piping Systems - Dimensions of pipes and tubes, materials and capacities, pressure drop calculations and charts, insulation and heat loss diagrams
Pumps - Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more

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Water - Suction Flow Velocity - Recommended water flow velocities on suction sides of pumps
Water Flow - Delivery Velocity - Required maximum flow velocity in water systems - delivery side of the pump

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