LMNO Engineering newsletters
2026
February 9, 2026. Gas Flow Calculators
LMNO Engineering, Research, and Software, Ltd.
The fluid flow calculations website: https://www.LMNOeng.com
7860 Angel Ridge Rd. Athens, Ohio 45701 USA (740) 707-2614
LMNO@LMNOeng.com
Newsletter. February 9, 2026.
Gas Flow Calculators
Since we have many gas flow calculators for different purposes, I will describe their applications.
https://www.LMNOeng.com/Flow/weymouth.php - This calculator determines flow rate and pressure loss in long, constant diameter gas transmission pipelines that extend for several miles or kilometers. It incorporates gas compressibility and captures how changes in pressure affect both gas density and velocity within a pipeline of fixed diameter.https://www.LMNOeng.com/Gas/choke.php - This calculator models choked compressible gas flow from a tank to a pipe with discharge to the atmosphere or a reservoir. It determines velocity, Mach number, temperature, pressure, and density at the pipe inlet and outlet.
https://www.LMNOeng.com/Gas/GasLeakRate.php - This calculator predicts the steady flow rate of a gas from a leak in a pipeline or tank that remains at constant pressure. It models both sonic and subsonic conditions.
https://www.LMNOeng.com/Depressure/gas-tank-depressurization-time.php - This is our newest calculator, which we added in 2025. It determines the time for a tank to depressurize. It models both isothermal and isentropic flow conditions for both sonic and subsonic flow. It also includes tabular and graphical results of pressure versus time as the tank depressurizes.
https://www.LMNOeng.com/Flow/SmallOrificeGas.php and https://www.LMNOeng.com/Flow/OrificeGas.php - These two calculators are for orifice flow meters for measuring gas flow rate in a pipe. They offer dropdown menus to compute flow rate, pressure drop, or diameter sizing. SmallOrificeGas is for pipe diameter less than 5 cm while OrificeGas is for 5 cm or larger.
https://www.LMNOeng.com/Flow/GasFlow.php - This handy calculator converts between gas volumetric and mas flow rates.
https://www.LMNOeng.com/Flow/GasViscosity.php - This calculator computes the viscosity for various gases based on their temperature.
Please let me know if questions. Thank you for your interest in the LMNO Engineering newsletter,
Ken Edwards, Ph.D., P.E. (Owner/Engineer)
LMNO Engineering, Research, and Software, Ltd.
https://www.LMNOeng.com LMNO@LMNOeng.com
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© 2026 LMNO Engineering, Research, and Software, Ltd.
© 2026 LMNO Engineering, Research, and Software, Ltd. All rights reserved.
LMNO Engineering, Research, and Software, Ltd.
7860 Angel Ridge Rd. Athens, Ohio 45701 USA Phone: (740) 707‑2614
LMNO@LMNOeng.com
https://www.LMNOeng.com