Base Temperature (°C)

Base Pressure (bar)

Line Temperature (°C)

Line Pressure (bar)

Methane (CH₄) %

Percent by mole

Ethane (C₂H₆) %

Percent by mole

Propane (C₃H₈) %

Percent by mole

n-Butane (n-C₄H₁₀) %

Percent by mole

i-Butane (i-C₄H₁₀) %

Percent by mole

Carbon Dioxide (CO₂) %

Percent by mole

Nitrogen (N₂) %

Percent by mole

Hydrogen (H₂) %

Percent by mole

Advanced Components

Oxygen (O₂) %

Percent by mole

Water (H₂O) %

Percent by mole

n-Pentane (n-C₅H₁₂) %

Percent by mole

i-Pentane (i-C₅H₁₂) %

Percent by mole

n-Hexane (n-C₆H₁₄) %

Percent by mole

n-Heptane (n-C₇H₁₆) %

Percent by mole

n-Octane (n-C₈H₁₈) %

Percent by mole

n-Nonane (n-C₉H₂₀) %

Percent by mole

n-Decane (n-C₁₀H₂₂) %

Percent by mole

Carbon Monoxide (CO) %

Percent by mole

Hydrogen Sulfide (H₂S) %

Percent by mole

Argon (Ar) %

Percent by mole

C6 Plus (C₆⁺) %

Percent by mole

C7 Plus (C₇⁺) %

Percent by mole

C8 Plus (C₈⁺) %

Percent by mole

C9 Plus (C₉⁺) %

Percent by mole

C10 Plus (C₁₀⁺) %

Percent by mole

Helium (He) %

Percent by mole

Result stream

About the calculator

The calculator mirrors a simplified AGA8-DC92 workflow: enter base/line conditions, supply component percentages (26 slots), and we compute pseudo molecular weight plus an idealized density.

Key features

• Two-column layout for quick temperature/pressure entry. • Collapsible advanced block for heavier components and inert gases. • Validates that component totals stay between 0–105% to catch typos.

Computation summary

Pseudo molecular weight = Σ(fraction × MW). Density ≈ (P × MW) / (R × T) using the line conditions (Z≈1). The output insight lists top contributors so you can sanity-check feeds.

How to use

1. Enter base temperature/pressure (typically contract). 2. Set actual line conditions. 3. Provide component fractions as percentages; use Sample Data for a baseline. 4. Click run to get pseudo MW, density, and composition summary.