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Viscous Liquids - Max. Suction Flow Velocities

Recommended max. pump suction flow velocity for viscous fluids.

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Avoid higher velocities in suction pipes. Higher velocities increases pressure loss in pipes and the pumps may start to cavitate. For viscous liquids - as a rule of thumb - the suction velocities in front of pumps should be below:

Viscous Liquids - Max. Suction Flow Velocities
Pipe boreMax. Suction Velocity
inchesmmm/sft/s
1 25 0.3 1
2 50 0.33 1.1
3 75 0.36 1.2
4 100 0.4 1.3
6 150 0.43 1.4
8 200 0.45 1.5
10 250 0.5 1.7
12 300 0.5 1.7

These values depends a lot on the fluid pumped. More about viscosity and viscosities for different fluids:

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