Pressure loss gas pipe

Ultra-Pure Gas Systems
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📝 How it works:
Calculates pressure loss in gas pipes based on diameter, length and volume flow according to Darcy-Weisbach

Fill in the fields below and click "Calculate".

Calculating pressure loss in gas pipes according to Darcy-Weisbach

The pressure loss in gas pipes is critical for the design of high-purity gas systems. Our calculator determines:

  • Pressure loss: According to the Darcy-Weisbach equation
  • Pipe dimensioning: Finding the optimum diameter
  • Flow velocity: Avoid erosion and turbulence
  • Length-related pressure loss: mbar/m for system planning
  • Compensation: Calculate required inlet pressure

Darcy-Weisbach equation:

Δp = λ × (L/D) × (ρ × v²) / 2

  • λ = Pipe friction coefficient (depending on Re and roughness)
  • L = pipe length, D = inside diameter
  • ρ = density of the gas, v = flow velocity

Recommended maximum gas velocities:

  • Pure gases (UHP): 5-10 m/s (avoid particle turbulence)
  • Industrial gases: 10-20 m/s
  • Process gases: 15-25 m/s
  • Compressed air: 20-30 m/s

Practical tip: For high-purity gas systems, low pressure loss is important for purity and energy efficiency. Rule of thumb: max. 10% pressure loss from the inlet pressure. At 6 bar inlet, max. 0.6 bar loss up to the consumption point. Also take fittings, elbows and valves into account (ζ values)!

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