Issued by the American Petroleum Institute:
the international DP flow meter standard for the oil and gas industry
API 21.1 is the key guideline that ensures accurate and consistent flow measurementeven under extreme operating conditions.
A mandatory standard for oil and gas projects worldwide, securing both safety and economy.
| Item | Details | Criteria |
|---|---|---|
| Industries | Oil, natural gas, petrochemical, refining, power plants | All sectors: upstream, midstream, downstream |
| Measuring devices | Orifice plates, venturi tubes, flow nozzles | Compatible with ISO 5167, linked to AGA-3 |
| Design guidelines | Mechanical design, material selection, machining tolerances | ¹0.05% precision, Ra 0.8 Ξm surface roughness |
| Measurement Accuracy | Correction methods, fluid property correction, uncertainty evaluation | Total uncertainty within Âą0.5% |
| Operating conditions | High temperature (600°C), high pressure (400 bar), corrosive fluids | NACE MR0175 corrosion criteria applied |
| Quality Control | Inspection, testing and certification procedures | API Q1, ISO 9001 quality systems |
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