HazenβWilliams (water): headloss screening for turbulent water using a default Cβ120 (verify for pipe condition).
Gas density from MW & Z:Ο = (PΒ·MW)/(ZΒ·RΒ·T) with P absolute and R universal gas constant.
Isothermal gas (rigorous): integrates isothermal Darcy form with variable density (constant f assumption) and iterates elevation using average density.
Weymouth / Panhandle: empirical pipeline gas equations on standard flow basis; tool converts mass flow β standard flow internally.
Use DarcyβWeisbach for most engineering applications. Pipeline gas equations are for long-distance transmission and have strict applicability.
Assumptions / Notes
Minor losses are represented via equivalent length only (no explicit K table). Include valves/fittings as equivalent length or via project standards.
Constant-density Darcy is acceptable for liquids and for gas only when ΞP < ~10% of absolute pressure (screening rule).
Compressible gas model assumes isothermal flow, constant Z, and constant friction factor (screening); for high accuracy, iterate properties along the line.
Elevation term uses inlet/average density; for gases with large elevation and ΞP, verify with a dedicated tool.
Velocity warnings are generic; confirm against company/API erosional velocity practices as applicable.
Standards / References
Crane TP-410: Flow of Fluids (DarcyβWeisbach, minor losses, friction factor practice).
ISO 5167 concepts for flow measurement are not used directly here (no restriction devices modeled).
Gas pipeline correlations: Weymouth and Panhandle A/B (industry practice for transmission; use with stated ranges).
Moody/Colebrook friction factor basis; Haaland explicit approximation used for robustness.
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