Continuity in a full pipe
Pipe mean velocity
Inputs
Steady volumetric flow through a circular full-flowing pipe.
Internal diameter of the circular passage.
Results
Mean velocityv
1.5915
V = 4 Q / (π D²)
A first-pass number, not a code check, certification, or approval. Read the method and its limits below. What this is and is not.
Nearby: Hydrostatic pressure · Flow continuity · Bernoulli equation · Dynamic pressure
Method
Formula, when it applies, and when it does not
Calculate mean velocity in a circular full-flowing pipe from volumetric flow and inside diameter.
V = 4 Q / (π D²)
When
- Incompressible
- Pipe running full
- Uniform density
Don’t
- This is mean velocity from continuity in a circular full pipe. It does not size the pipe, calculate pressure drop, or classify the flow regime.