Natural Gas Pressure Loss Calculator

Weymouth Pressure Loss Formula:

\[ \Delta P = \frac{Q^2 \times G \times L}{C_r \times d^5} \]

Flow Rate (Q):

scfh

Specific Gravity (G):

Pipe Length (L):

Weymouth Constant (C_r):

Pipe Diameter (d):

Pressure Loss (ΔP): psi

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1. What is a Natural Gas Pressure Loss Calculator?

Definition: This calculator estimates the pressure drop in natural gas pipelines using the Weymouth equation.

Purpose: It helps engineers and technicians determine pressure losses in gas distribution systems for proper system design.

2. How Does the Calculator Work?

The calculator uses the Weymouth formula:

\[ \Delta P = \frac{Q^2 \times G \times L}{C_r \times d^5} \]

Where:

\( \Delta P \) — Pressure loss (psi)
\( Q \) — Flow rate (standard cubic feet per hour, scfh)
\( G \) — Specific gravity of gas (relative to air)
\( L \) — Pipe length (feet)
\( C_r \) — Weymouth constant (typically 43,200)
\( d \) — Pipe internal diameter (inches)

Explanation: The equation calculates pressure drop based on flow characteristics and pipe dimensions.

3. Importance of Pressure Loss Calculation

Details: Accurate pressure loss estimation ensures proper gas flow, system efficiency, and compliance with safety standards.

4. Using the Calculator

Tips: Enter the flow rate, gas specific gravity (default 0.6 for natural gas), pipe length, Weymouth constant (default 43,200), and pipe diameter. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the Weymouth constant?
A: It's an empirical constant (typically 43,200) that accounts for units and gas properties in the Weymouth equation.

Q2: What's a typical specific gravity for natural gas?
A: Natural gas typically has a specific gravity of 0.6 relative to air, but this can vary slightly.

Q3: When would I change the Weymouth constant?
A: Only adjust if using different units or for specific gas compositions where a modified constant is recommended.

Q4: What pipe diameter should I use?
A: Use the actual internal diameter of the pipe, not the nominal size.

Q5: Does this account for elevation changes?
A: No, the basic Weymouth equation doesn't include elevation effects. For significant elevation changes, use more advanced methods.