1. What is the Natural Gas Flow Equation?

The natural gas flow equation estimates volumetric flow rate through a pipe based on diameter, pressure difference, and gas specific gravity. This simplified version is commonly used for natural gas applications.

2. How Does the Calculator Work?

The calculator uses the natural gas flow equation:

Where:

• \( Q \) — Volumetric flow rate (cubic feet per hour, CFH)
• \( d \) — Internal diameter of pipe (inches)
• \( \Delta P \) — Pressure drop (inches of water column)
• \( SG \) — Specific gravity of gas (relative to air)

Explanation: The equation accounts for the relationship between pipe size, pressure differential, and gas properties to estimate flow rate.

3. Importance of Flow Calculation

Details: Accurate flow estimation is crucial for designing gas piping systems, sizing equipment, and ensuring proper operation of gas appliances.

4. Using the Calculator

Tips: Enter pipe diameter in inches, pressure difference in inches of water column, and specific gravity (0.6 for natural gas). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical specific gravity for natural gas?
A: Natural gas typically has a specific gravity of about 0.6 relative to air.

Q2: What are typical pressure drops in gas piping?
A: Residential systems often use 0.5" wc pressure drop, while commercial systems may use higher values.

Q3: What are the limitations of this equation?
A: This simplified version assumes standard conditions and doesn't account for temperature, elevation, or pipe roughness.

Q4: How accurate is this calculation?
A: It provides a reasonable estimate for most applications, but for precise calculations, more detailed methods should be used.

Q5: Can this be used for other gases?
A: Yes, but you must use the correct specific gravity for the gas in question.