Pipe size example
How much water through a 22 mm pipe?
A 22 mm pipe is a common mid-size choice for domestic supply and branch circuits.
Quick estimate
Using a typical 1.5 m/s velocity
Example build-up
Internal diameter: 22 mm. Velocity: 1.5 m/s.
Estimated flow is about 34.2 L/min, or 2.06 m3/h.