Inflection Point Engineering Calculators

Orifice Plate Sizing — Liquid

Liquid orifice plate bore, discharge coefficient, and permanent pressure loss for a given β ratio per ISO 5167 and AGA Report No. 3.

Standards: ISO 5167-2 (orifice plates); AGA Report No. 3 (orifice metering). Cd shown uses the Stolz/early Reader-Harris approximation — for custody transfer use the full Reader-Harris/Gallagher equation. Valid for Re > 10,000 and 0.2 ≤ β ≤ 0.75.