Gas Volume Flowrate Converter

Technical Notes

Variable Definitions

• Q = volumetric flow rate (m³/s on a specified basis)
• P = absolute pressure (Pa)
• T = absolute temperature (K)
• Z = compressibility factor (dimensionless)
• ṅ = molar flow rate (mol/s)
• Subscripts: s = Standard base (S), n = Normal base (N), act = Operating/Actual (A)

Formulas / Logic

• Gas law with real-gas correction: ṅ = (P · Q) / (Z · R · T)
• Convert input volumetric flow to molar flow using its basis (S / N / A).
• Convert molar flow back to volumetric flow at target basis: Q_target = (ṅ · Z_target · R · T_target) / P_target
• Time-base conversions: 1 h = 3600 s, 1 day = 86400 s.
• US customary volume: 1 ft³ = 0.0283168466 m³ (used for SCF/ACF conversions).

Assumptions / Notes

• Standard base (S) is fixed at 15°C and 101.325 kPa; Normal base (N) is fixed at 0°C and 101.325 kPa. Unit dropdowns in the reference sections change display only.
• Pressures must be absolute (not gauge). Temperatures must be above absolute zero; Z must be > 0.
• Accuracy depends on the selected Z_act. For custody-transfer / metering applications, obtain Z using recognized standards/correlations (e.g., ISO 12213 / AGA Report No. 8) suitable for your gas composition, pressure and temperature.
• Reference condition guidance: ISO 13443 specifies standard reference conditions for natural gas measurements; ISO 15970 gives requirements/procedures for measurement inputs used for volume calculation and volume conversion.