Gas Pipe Sizing Calculator

SANS 827:2011 (Natural Gas) & SANS 10087-1 (LPG) referenced — Darcy-Weisbach / Colebrook-White pressure drop calculation.

Engineering estimate — not a compliance certificate. Pipe schedules, fitting equivalent-length values, and pressure-drop allowances used here are typical reference figures. Confirm current clause numbers and tables in SANS 827:2011, SANS 10087-1 and SANS 1067-2, and have the final design checked/signed off by a registered gas practitioner (LPGSA/SAQCC Gas) before installation.
Input Parameters
Common single-stage domestic LPG regulators are rated around 1.5-4 kg/h. Leave blank/0 to skip this check.
Fittings

Applied as an equivalent pipe length added to the run.

Regulatory Reference

  • Maximum pressure drop: 300 Pa (0.3 kPa) — SANS 827:2011 / SANS 10087-1.
  • Minimum LPG pipe size: DN20 (steel-equivalent).
  • Copper pipe standard: SANS 1067-2.
  • HDPE burial depth: 500 mm minimum, buried installation only.
  • Pipe cleaning/preparation: internal bore must be clean, dry, and free of swarf/debris before jointing and pressure testing — as required by SANS 827 / SANS 10087-1.
  • Calculation method: Darcy-Weisbach equation with Colebrook-White friction factor (iterative), the accepted industry method for gas pipe sizing.