Pressure Drop Calculator — Estimate Fluid Flow Pressure Loss

Pressure Drop Calculator

Calculate pressure drop in pipes for various fluids and flow conditions. Estimate pressure loss, flow rates, and pipe sizing for engineering projects.

Step 1: Pipe Dimensions & Flow

Pressure Drop Calculation

Uses Darcy-Weisbach equation: ΔP = f (L/D) (ρ v²/2). Accounts for pipe roughness, fluid properties, and flow regime (laminar/turbulent).

Step 2: Fluid Properties

Fluid Properties

Water (20°C): ρ=62.4 lb/ft³, μ=1.0 cP. Air (20°C): ρ=0.075 lb/ft³, μ=0.018 cP. Oil (SAE 30): ρ=54.0 lb/ft³, μ=200 cP.

Pressure Drop Analysis

Summary
Detailed Results
Loss Breakdown

Total Pressure Drop

12.4 psi
Turbulent flow (Re = 45,200)
Flow Velocity
5.1 ft/s
Head Loss
28.7 ft
Friction Factor
0.021
Reynolds Number
45,200

Detailed Pressure Drop Results

Parameter Value Unit Description

Pressure Loss Breakdown

Pressure Drop Formula

Darcy-Weisbach Equation: ΔP = f (L/D) (ρ v²/2)

Where: f = friction factor, L = pipe length, D = pipe diameter, ρ = fluid density, v = flow velocity. Friction factor calculated using Colebrook equation for turbulent flow.

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