Gas Pipe Sizing Calculator UK

Pipe Diameter Formula:

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

Gas Flow Rate (Q):

m³/h

Pipe Length (L):

Friction Factor (f):

Pressure Drop (ΔP):

mbar

Pipe Diameter (mm):

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1. What is a Gas Pipe Sizing Calculator UK?

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

Purpose: It helps gas engineers and installers determine appropriate pipe sizes for gas distribution systems in compliance with UK standards.

2. How Does the Calculator Work?

The calculator uses the formula:

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

Where:

\( D \) — Pipe diameter (mm)
\( Q \) — Gas flow rate (m³/h)
\( L \) — Pipe length (m)
\( f \) — Friction factor (dimensionless)
\( \Delta P \) — Pressure drop (mbar)

Explanation: The formula calculates the minimum pipe diameter needed to maintain the specified pressure drop for the given flow conditions.

3. Importance of Proper Gas Pipe Sizing

Details: Correct pipe sizing ensures adequate gas supply to appliances, maintains safe pressure levels, and complies with UK gas safety regulations.

4. Using the Calculator

Tips: Enter the gas flow rate in m³/h, pipe length in meters, friction factor (default 0.0075 for steel pipes), and allowable pressure drop (default 1 mbar). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical friction factor for gas pipes?
A: For steel pipes, 0.0075 is common. For copper pipes, use 0.009. Always consult relevant standards for specific applications.

Q2: What's a reasonable pressure drop for gas pipes?
A: In the UK, 1 mbar is typical for low-pressure systems, but this may vary based on installation requirements.

Q3: How do I determine the gas flow rate?
A: Sum the gas consumption rates of all appliances that might operate simultaneously on the pipe run.

Q4: Does this calculator account for fittings and bends?
A: No, for accurate sizing you should add equivalent lengths for fittings to the total pipe length.

Q5: Is this calculator suitable for all gas types?
A: It's primarily designed for natural gas. For LPG or other gases, consult specific guidelines.