ASTM D6122-23 PDF

Overview

ASTM D6122-23 provides a comprehensive standard practice for validating the performance of multivariate online, at-line, field, and laboratory infrared spectrophotometer and Raman spectrometer based analyzer systems. Developed by ASTM International, this practice is critical for ensuring the reliability of infrared and Raman analyzers used to measure the physical, chemical, or quality properties of liquid petroleum products and fuels. The validation process ensures that results from these advanced analyzer systems are statistically equivalent to those obtained by traditional primary test methods (PTM), enhancing quality control, process efficiency, and regulatory compliance in the petroleum and fuels industries.

Key Topics

• Scope of Application

  • Covers laboratory, field, at-line, and online infrared (near- and mid-infrared) and Raman analyzers.
  • Applies to systems that calculate properties of liquid petroleum products and fuels from spectroscopic data using multivariate modeling.

• Validation Procedures

  • Local Validation: Uses a limited set of real-world samples representative of current production, to show agreement between analyzer and PTM results within user-specified confidence limits.
  • General Validation: Employs a broader, more statistically varied sample set, allowing for validation across the full calibration space using established methodologies such as ASTM D6708.
  • Ongoing (Continual) Validation: Involves routine quality assurance and control chart monitoring to maintain validated status of analyzer systems after initial validation.

• Model Applicability

  • Emphasizes that validation is only valid for samples that fall within the calibration model’s defined population.
  • Outlier detection methods are applied to ensure that the sample spectra are within the calibration range and suitable for reliable measurement.

• Statistical Confidence and Uncertainty

  • Results are only considered validated if they meet user-defined statistical confidence levels.
  • The difference between analyzer results and PTM must fall within calculated uncertainty bounds, ensuring high confidence in reported values.

• Instrument and Model Performance Verification

  • Details procedures for verifying both hardware stability and correct model operation.
  • Includes performance checks with instrument verification samples to detect any drift or malfunction.

Applications

ASTM D6122-23 is widely applied in:

• Process Analytical Technology: Supporting compliance and optimization in refinery and petrochemical operations by enabling rapid, real-time quality analysis.
• Product Release and Certification: Validating analyzer systems for product property certification in alignment with regulatory and contractual requirements.
• Research and Development: Providing framework for the evaluation of new analyzers, calibration transfers, and multivariate modeling techniques.
• Quality Assurance: Ensuring ongoing analyzer reliability through regular validation, supporting manufacturing consistency and customer confidence.

Industries that benefit include petroleum refining, fuel distribution, quality control laboratories, and chemical processing, where accurate measurement of multiple product qualities is essential.

Related Standards

To effectively implement ASTM D6122-23, familiarity with related ASTM standards is recommended, including:

• ASTM D6708: Statistical assessment of agreement between test methods for the same property.
• ASTM D8321: Development and validation of multivariate analyses for spectroscopic measurements.
• ASTM D3764: Performance validation of process stream analyzer systems.
• ASTM D8340: Performance-based qualification of spectroscopic analyzer systems.
• ASTM D6299: Statistical quality assurance and control charting techniques.
• ASTM E131/E456/E932/E1421: Terminology and performance measurement guidelines for molecular spectroscopy.

These standards provide critical support for sample handling, calibration, measurement, statistical validation, and ongoing quality control.

Adhering to ASTM D6122-23 ensures robust validation of multivariate infrared and Raman analyzer systems, supporting regulatory compliance, process optimization, and industry best practices in liquid fuel and petroleum product analysis.