Pressure Loss in Pipe Calculator

Pressure Loss Formula:

\[ \Delta P = f \times \left( \frac{L}{D} \right) \times \left( \frac{\rho \times V^2}{2} \right) \]

Friction Factor (f):

dimensionless

Pipe Length (L):

meters

Pipe Diameter (D):

meters

Fluid Density (ρ):

kg/m³

Fluid Velocity (V):

m/s

Pressure Loss (ΔP):

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1. What is Pressure Loss in Pipe?

Definition: Pressure loss (or pressure drop) refers to the reduction in fluid pressure as it flows through a pipe due to friction and other factors.

Purpose: This calculator helps engineers and technicians determine the pressure drop in piping systems for proper system design and pump selection.

2. How Does the Calculator Work?

The calculator uses the Darcy-Weisbach equation:

\[ \Delta P = f \times \left( \frac{L}{D} \right) \times \left( \frac{\rho \times V^2}{2} \right) \]

Where:

\( \Delta P \) — Pressure drop (Pascals)
\( f \) — Darcy friction factor (dimensionless)
\( L \) — Length of pipe (meters)
\( D \) — Inner diameter of pipe (meters)
\( \rho \) — Fluid density (kg/m³)
\( V \) — Average fluid velocity (m/s)

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

3. Importance of Pressure Loss Calculation

Details: Accurate pressure loss calculations are crucial for designing efficient piping systems, selecting appropriate pumps, and ensuring proper fluid flow rates.

4. Using the Calculator

Tips: Enter the friction factor (default 0.02 for turbulent flow in smooth pipes), pipe dimensions, fluid properties, 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's a typical density for water?
A: Water at 20°C has a density of about 1000 kg/m³. The default value is set for water.

Q3: Does this include minor losses?
A: No, this calculates only the major (friction) losses. Minor losses from fittings and valves must be calculated separately.

Q4: What units should I use?
A: Use consistent SI units: meters for length/diameter, kg/m³ for density, m/s for velocity.

Q5: How accurate is this calculation?
A: Accuracy depends on correct friction factor estimation and assuming steady, fully developed flow in straight pipes.