Gas Pipe Sizing Calculator

Pipe Diameter Formula:

\[ D = \sqrt{ \frac{4 Q L f}{\pi^2 \Delta P / \rho} } \]

Flow Rate (Q):

m³/s

Pipe Length (L):

Friction Factor (f):

dimensionless

Pressure Drop (ΔP):

Gas Density (ρ):

kg/m³

Pipe Diameter (m):

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1. What is a Gas Pipe Sizing Calculator?

Definition: This calculator estimates the required diameter of a gas pipe based on flow rate, pipe length, friction factor, pressure drop, and gas density.

Purpose: It helps engineers and technicians properly size gas piping systems to ensure adequate flow while maintaining safe pressure levels.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ D = \sqrt{ \frac{4 Q L f}{\pi^2 \Delta P / \rho} } \]

Where:

\( D \) — Pipe diameter (meters)
\( Q \) — Volumetric flow rate (m³/s)
\( L \) — Pipe length (meters)
\( f \) — Darcy friction factor (dimensionless)
\( \Delta P \) — Pressure drop (Pascals)
\( \rho \) — Gas density (kg/m³)

Explanation: The formula balances flow requirements with acceptable pressure loss to determine the minimum pipe diameter needed.

3. Importance of Proper Pipe Sizing

Details: Correct pipe sizing ensures efficient gas delivery, prevents excessive pressure drops, maintains safety, and reduces installation costs.

4. Using the Calculator

Tips: Enter all required parameters. Typical values: friction factor (0.02 for turbulent flow), natural gas density (~0.7 kg/m³), air density (~1.2 kg/m³).

5. Frequently Asked Questions (FAQ)

Q1: What's a typical friction factor for gas pipes?
A: For turbulent flow in smooth pipes, 0.02 is common. For rough pipes, it may be higher (0.03-0.05).

Q2: How do I determine gas density?
A: Use ideal gas law (ρ = P/(RT)) or reference tables. For natural gas at STP, ~0.7 kg/m³.

Q3: What's a reasonable pressure drop?
A: Typically 100-500 Pa for distribution systems, but depends on application and regulations.

Q4: Does this work for liquid pipes?
A: The formula works for any fluid, but liquid calculations often consider different factors.

Q5: Should I round up the calculated diameter?
A: Yes, always select the next available standard pipe size larger than the calculated diameter.