Gas Line Sizing Calculator

Assumptions: quick‑estimate tables with typical allowable pressure drop (≈1.0 kPa NG / 2.75 kPa LPG), domestic/light commercial ranges, run lengths 5–50 m.

LPG capacities are scaled above NG; Biogas scaled below NG; H₂ scaled substantially below NG (lower volumetric energy). CSST applies a reduction vs rigid steel; PEX‑AL‑PEX is similar to PE with a modest reduction. Always confirm with local gas code, manufacturer data, and detailed sizing for long runs, high loads, or uncommon systems.

Run length is snapped up to the next bin (5, 10, 15, 20, 30, 40, 50 m) for a conservative recommendation. For precise design, use full friction‑loss calcs or official tables.