Does this calculate the ISO 5167 discharge coefficient?

No. C must come from the applicable current procedure or controlled calculation including the correct tapping arrangement,geometry and Reynolds-number treatment.

Does this calculate gas expansibility?

No. Epsilon must be documented for the same operating point;the worksheet does not infer it without upstream pressure,pressure ratio and thermodynamic data.

Is the output an ISO conformity result?

No. It is arithmetic using entered coefficients. Installation,geometry,flow regime,uncertainty and all current ISO requirements remain separate.

What volume-flow basis is displayed?

The displayed volume flow is on the same upstream density basis entered. It is not a standard or normal gas volume flow.

Source-gated flow arithmetic

Documented-Coefficient Orifice Flow

Calculate flow only after C and ε have been established for the exact plate,tappings,flow regime and operating point by the controlling procedure.

C not inventedε not inventedNot ISO conformity

Coefficient-based arithmetic

Upstream-basis volume flow qv

—

Mass flow qm

—

Diameter ratio β

—

Orifice area

—

Entered-coefficient arithmetic only.

Implemented arithmetic

qv = [C·ε / √(1−β⁴)] · (πd²/4) · √(2Δp/ρ1); β=d/D; qm=ρ1qv

All quantities are converted to SI before calculation.qv is volume flow on the entered upstream-density basis;it is not standard/normal gas volume.C and ε are inputs,not results.

Current standards

ISO5167-1:2022,edition3,sets general principles,installation and uncertainty requirements.The public scope requires a full circular conduit,single-phase subsonic non-pulsating flow.ISO5167-2:2022,edition2,covers qualifying orifice plates with flange,corner,or D andD/2 tappings in conjunction with Part1;its public scope excludes D below50mm or above1000mm and pipe Reynolds number below5000.

Not an ISO calculator: exact C,ε,beta/Reynolds limits,tap corrections,geometry,straight lengths and uncertainty rules remain NEEDS_LICENSED_SOURCE.Passing this input gate does not establish ISO conformity,custody-transfer suitability or fitness for service.

Removed unsafe model

The previous page called `0.5959+0.0312β^2.1−0.184β^8` a simplified Reader-Harris coefficient while omitting Reynolds and tapping terms.It also accepted arbitrary ε without upstream pressure or thermodynamic inputs.That model is not retained.

Извори

ISO5167-1:2022 official record; ISO5167-2:2022 official record; ISO/TR12767:2023 official record.