Menu

Pump water suction flow velocity

What is the recommended velocity for water flow at inlet of a pump ?

Follow us on Twitter
Question, remark ? Contact us at contact@myengineeringtools.com


Section summary
1. Flow velocity at the inlet of a pump
2. Water flow velocity design recommendations
3. Water velocity in pipes calculation

1. Flow velocity at the inlet of a pump

This page is giving references to design the inlet piping of water pump to make sure the velocity of water is high enough.

When designing or troubleshooting an existing water pumping system it is important to check what will be the velocity of water in the pipe at the inlet of the pump is not too low. Indeed, if the flow is too low, then the pump risks to be starved in water which may lead to cavitation and lower capacities than foreseen.

2. Water flow velocity design recommendations

The following velocities in the suction pipes of a water pump are recommended, depending on the pipe diameter :

Pipe Diameter Water suction flow velocity recommended
Inches mm m/s ft/s
1 25 0.46 1.5
2 50 0.49 1.6
3 75 0.52 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

3. Water velocity in pipes calculation

The velocity of water in pipe can be calculated with the following formula :

u=Qv/(π*D2/4)

With :

u = water flow velocity (m/s)
Qv = water volumetric flowrate in pipe (m3/s)
D = pipe diameter (m)



Copyright www.MyEngineeringTools.com

The content of MyEngineeringTools.com is copyrighted but no warranty nor liability is ensured. The content of this site is to be seen as a help and important information and calculation must always be double checked by the user through the quality procedure of his organization or by checking another source. The user must always respect all applicable regulation. The use of the information is at the user and its organization own risk and own cost.

About privacy and cookies on this site

Our site uses cookies and other technologies from 3rd party companies. Access our Privacy Policy in the "About" page to know more about those cookies and technologies . Further use of this site will be considered consent.

www.myengineeringtools.com is secured by SSL encryption

Follow us on Twitter