Pipe Flow Head Loss Calculator

Head Loss Formula (Darcy-Weisbach):

\[ h_f = f \times \left( \frac{L}{D} \right) \times \left( \frac{V^2}{2g} \right) \]

Friction Factor (f):

dimensionless

Pipe Length (L):

meters

Pipe Diameter (D):

meters

Flow Velocity (V):

m/s

Head Loss (h_f):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is a Pipe Flow Head Loss Calculator?

Definition: This calculator estimates the head loss due to friction in a pipe using the Darcy-Weisbach equation.

Purpose: It helps engineers and fluid system designers determine pressure drops in piping systems.

2. How Does the Calculator Work?

The calculator uses the Darcy-Weisbach equation:

\[ h_f = f \times \left( \frac{L}{D} \right) \times \left( \frac{V^2}{2g} \right) \]

Where:

\( h_f \) — Head loss due to friction (meters)
\( f \) — Darcy friction factor (dimensionless)
\( L \) — Length of pipe (meters)
\( D \) — Diameter of pipe (meters)
\( V \) — Flow velocity (meters/second)
\( g \) — Gravitational acceleration (9.81 m/s²)

Explanation: The equation calculates energy loss due to friction between the fluid and pipe walls.

3. Importance of Head Loss Calculation

Details: Accurate head loss calculations are essential for proper pump selection, system design, and ensuring adequate flow rates in piping systems.

4. Using the Calculator

Tips: Enter the friction factor (typically 0.01-0.05 for turbulent flow), pipe length, diameter, and flow velocity. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine the friction factor?
A: For turbulent flow, use Moody chart or Colebrook equation. For laminar flow (Re < 2000), f = 64/Re.

Q2: What units should I use?
A: Use consistent SI units (meters for length/diameter, m/s for velocity) for accurate results.

Q3: Does this include minor losses?
A: No, this calculates only major (friction) losses. Add minor losses from fittings separately.

Q4: What's a typical flow velocity?
A: Common design velocities are 1-3 m/s for water systems to balance head loss and pipe size.

Q5: How does pipe material affect results?
A: Material affects friction factor - smoother pipes (e.g., PVC) have lower f values than rough pipes (e.g., concrete).