1. What is a Pipe Pressure Drop Calculator?

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

Purpose: It helps engineers and designers determine the energy loss in piping systems for proper pump sizing and system design.

2. How Does the Calculator Work?

The calculator uses the Darcy-Weisbach equation:

Where:

• \( \Delta P \) — Pressure drop (Pascals)
• \( f \) — Darcy friction factor (dimensionless)
• \( L \) — Pipe length (meters)
• \( D \) — Pipe diameter (meters)
• \( \rho \) — Fluid density (kg/m³)
• \( V \) — 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 Drop Calculation

Details: Accurate pressure drop calculations ensure proper system performance, energy efficiency, and correct pump selection.

4. Using the Calculator

Tips: Enter the friction factor (default 0.02 for turbulent flow), pipe dimensions, fluid properties, and 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 smooth pipes, f ≈ 0.02-0.04.

Q2: What's a typical fluid velocity in pipes?
A: Common velocities are 1-3 m/s for water, but depends on application and pipe size.

Q3: Does this account for fittings and valves?
A: No, this calculates straight pipe only. Use equivalent length method for fittings.

Q4: Can I use this for gases?
A: Yes, but for compressible fluids, additional factors may be needed for accurate results.

Q5: How do I convert the result to other units?
A: 1 Pa = 0.000145 psi, or multiply by 0.102 to get pressure drop in mm H₂O.