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Static Pressure Calculator

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Input Parameters

Unit System

Results

Pressure Analysis

0
Velocity Pressure in WG
0
Friction Loss in WG
0
Total Pressure in WG

Parameters

Velocity1,200 FPM
Duct Length100 ft
Hydraulic Diameter1 ft

Calculation Steps

1

Calculate Velocity Pressure

Formula:
VP=ρV22gVP = \frac{\rho V^2}{2g}
Calculation:
VP=0.0750×20.0022×32.174VP = \frac{0.0750 \times 20.00^2}{2 \times 32.174}
Result:
0.4662 psf0.4662 \text{ psf}
2

Convert Velocity Pressure to Display Units

Formula:
VPin.w.g.=VPpsf×0.1922VP_{in.w.g.} = VP_{psf} \times 0.1922
Calculation:
VP=0.4662×0.1922VP = 0.4662 \times 0.1922
Result:
0.090 in WG0.090 \text{ in WG}
3

Calculate Friction Loss

Formula:
ΔPf=fLρV22Dhg\Delta P_f = \frac{f L \rho V^2}{2 D_h g}
Calculation:
ΔPf=0.02×100.00×0.0750×20.0022×1.00×32.174\Delta P_f = \frac{0.02 \times 100.00 \times 0.0750 \times 20.00^2}{2 \times 1.00 \times 32.174}
Result:
0.9324 psf0.9324 \text{ psf}
4

Convert Friction Loss to Display Units

Formula:
ΔPf,in.w.g.=ΔPf,psf×0.1922\Delta P_{f,in.w.g.} = \Delta P_{f,psf} \times 0.1922
Calculation:
ΔPf=0.9324×0.1922\Delta P_f = 0.9324 \times 0.1922
Result:
0.179 in WG0.179 \text{ in WG}
5

Calculate Total Static Pressure

Formula:
Ptotal=VP+ΔPfP_{total} = VP + \Delta P_f
Calculation:
Ptotal=0.090+0.179P_{total} = 0.090 + 0.179
Result:
0.269 in WG0.269 \text{ in WG}