Force-main continuity (Q = V · A). Solve velocity from a known flow, or flow from a target velocity, with Reynolds number and flow regime for water or air at 20°C.
Inputs
Use the pipe's inside diameter. Reynolds assumes water at 20°C (ν = 1.004×10⁻⁶ m²/s).
Result
0velocity
.
0510+
.
Flow0
Reynolds0
Flow area0 ft²
Regime—
Formula appliedA = (π/4)·(d/12)² | V = 0.4085·q / d² | q = 2.448·V·d² | Re = V·(d/12) / ν, ν = 1.081×10⁻⁵ ft²/s (water 20°C)
