ISO 8222:2020 PDF

Overview

ISO 8222:2020 - Petroleum measurement systems - Calibration - Volumetric measures, proving tanks and field measures specifies requirements and guidance for the design, use and calibration of volumetric measures (capacity measures) used in laboratories, fixed sites and in the field. Applicable primarily to the petroleum industry, the standard covers test measures, prover tanks, portable/mobile measures and both standard and non‑standard devices. It excludes measures for cryogenic liquids and pressurized LPG/LNG measures. The document also includes reference formulae for properties of water and other fluids (Annex A) and guidance on temperature correction and material properties.

Key topics and technical requirements

• Classification: Measures are categorized by capacity - test measures (below 20 L) and prover tanks (above 20 L).
• Design features: Guidance on neck design, gauge glass, scale resolution, levelling, valves, connections, support and strength requirements.
• Calibration methods: Detailed procedures for gravimetric calibration, volumetric calibration (water pour/withdraw), and calibration by reference meter.
• Filling and drainage: Recommended filling/drainage methods, drainage times and fluid selection to reduce systematic errors.
• Measurement quality: Traceability, uncertainty estimation, calibration specifications and commonly expected uncertainties are addressed.
• Calculations and corrections: Procedures for transferred and reference volumes, temperature corrections and related calculation methods.
• Informative annexes: Properties of fluids and materials, temperature measurement/thermometers, meniscus reading, accuracy and uncertainty guidance.

Practical applications

ISO 8222:2020 is used to ensure accurate volume references for:

• Calibration of flowmeters, pipe provers and displacement provers.
• Onshore/offshore petroleum custody transfer systems, loading terminals and storage facilities.
• Portable field proving and mobile calibration services.
• Laboratory verification of volumetric measures and development of calibration certificates.

Adopting the standard helps improve measurement traceability, reduce transfer losses and ensure compliance with industry best practice for petroleum measurement systems, volumetric calibration and custody transfer accuracy.

Who should use this standard

• Calibration laboratories and metrology service providers.
• Terminal operators, pipeline and custody transfer managers.
• Instrument and prover tank manufacturers and test equipment designers.
• Quality assurance and regulatory bodies in the petroleum sector.

Related information

ISO 8222:2020 was developed by ISO/TC 28 (Petroleum and related products) and aligns with CEN collaboration. For full technical details, calibration circuits and calculation examples, consult the complete ISO 8222:2020 document.