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Friction Loss Calculator

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Input Parameters

Unit System

Imperial (°F, BTU, ft)SI (°C, kW, m)

Velocity (FPM)

Length (ft)

Diameter (in)

Roughness (ft)

Results

Friction Loss

0

Friction Loss in WG

0

Friction Factor

1,639,344

Reynolds Number

Calculation Steps

1

Calculate Reynolds Number

Formula:

Re = \frac{V \times D}{\nu}

Calculation:

Re = \frac{20.00 \times 1.0000}{1.22 \times 10^{-5}}

Result:

1639344 \text{ }

2

Calculate Friction Factor

Formula:

f = \frac{0.316}{Re^{0.25}}

Calculation:

f = \frac{0.316}{1639344^{0.25}}

Result:

0.0088 \text{ }

3

Calculate Friction Loss

Formula:

h_f = f \times \frac{L}{D} \times \frac{V^2}{2g}

Calculation:

h_f = 0.0088 \times \frac{100.00}{1.0000} \times \frac{20.00^2}{2 \times 32.174}

Result:

0.4117 \text{ psf}

4

Convert to Display Units

Formula:

P_{in.w.g.} = P_{psf} \times 0.1922

Calculation:

P = 0.4117 \times 0.1922

Result:

0.079 \text{ in WG}