ASTM D8086-20 PDF

Full title and description

Standard Test Method for Determination of Methanol and Ethanol in Electrical Insulating Liquids of Petroleum Origin by Headspace (HS)‑Gas Chromatography (GC) Using Mass Spectrometry (MS) or Flame Ionization Detection (FID). Designation: ASTM D8086-20. DOI: 10.1520/D8086-20. This test method specifies headspace GC procedures (GC‑MS or GC‑FID) for measuring methanol and ethanol formed by degradation of cellulosic insulating materials and dissolved in mineral insulating liquids and less‑flammable insulating liquids of mineral origin.

Abstract

ASTM D8086-20 defines a laboratory procedure using headspace gas chromatography, with either mass spectrometric or flame ionization detection, to determine methanol and ethanol concentrations in electrical insulating liquids of petroleum origin. The method is intended as a diagnostic tool for cellulose degradation in transformer and other electrical insulation systems and to complement dissolved gas analysis and furan testing.

General information

• Status: Active (current active edition).
• Publication date: 2020 (designation D8086-20); standard record last noted as active/updated Feb 12, 2021.
• Publisher: ASTM International (American Society for Testing and Materials).
• ICS / categories: ICS 29.040.10 (Insulating oils); Committee D27 (Electrical insulating liquids).
• Edition / version: D8086-20 (2020).
• Number of pages: 6 pages.

Scope

This test method describes determination of methanol and ethanol, by‑products of cellulosic material degradation, in electrical insulation systems immersed in petroleum‑origin insulating liquids. It applies to mineral insulating oils and less‑flammable insulating liquids of mineral origin; the method is not a practical application for ester‑based insulating fluids. The method covers sample preparation, headspace GC analysis (HS‑GC‑MS or HS‑GC‑FID), calibration, quantification, and reporting of methanol and ethanol concentrations.

Key topics and requirements

• Analysis technique: headspace gas chromatography with MS or FID detection (HS‑GC‑MS / HS‑GC‑FID).
• Target analytes: methanol and ethanol in insulating liquids (indicators of cellulose degradation).
• Sample handling and vial/headspace conditions to ensure reproducible partitioning and quantitation.
• Calibration and use of appropriate standards/internal standards to quantify low ppm to higher concentration ranges.
• Limits and applicability: validated for mineral oils and less‑flammable mineral‑origin fluids; not recommended for ester fluids.
• Reporting: concentration units in SI, method performance, and any deviations or interferences.
• Use as a complementary diagnostic alongside dissolved gas analysis and furan testing.

Typical use and users

Primary users include transformer and electrical equipment testing laboratories, utility condition‑monitoring teams, independent oil analysis laboratories, asset managers and maintenance engineers for power distribution equipment, insulating fluid manufacturers, and researchers studying insulation aging and failure mechanisms. Typical uses are routine condition monitoring, failure investigation, trend analysis for cellulose degradation, and research/quality control.

Related standards

Standards commonly referenced together with D8086-20 include ASTM D3612 (dissolved gas analysis in insulating oils), ASTM D5837 (furanic compounds in insulating liquids), ASTM D3487 (specifications for mineral insulating oils), ASTM D5222 (less‑flammable insulating liquids of mineral origin), ASTM D2864 (terminology relating to electrical insulating liquids and gases), and relevant IEC methods for insulating liquid testing. These related methods are used together to build a comprehensive condition assessment of insulating systems.

Keywords

methanol, ethanol, insulating liquids, transformer oil, headspace GC, GC‑MS, GC‑FID, cellulose degradation, furan, dissolved gas analysis, electrical insulating oil, oil analysis, condition monitoring

FAQ

Q: What is this standard?

A: ASTM D8086-20 is a test method that specifies headspace gas chromatography procedures (using MS or FID detection) to determine methanol and ethanol in electrical insulating liquids of petroleum origin.

Q: What does it cover?

A: It covers sample preparation, headspace GC analysis, calibration, quantification and reporting for methanol and ethanol in mineral insulating oils and less‑flammable mineral‑origin insulating liquids; it notes the method is not practical for ester fluids.

Q: Who typically uses it?

A: Utilities, transformer maintenance and condition monitoring laboratories, independent oil analysis labs, insulating fluid manufacturers, and researchers investigating insulation aging and failure.

Q: Is it current or superseded?

A: The D8086-20 edition (2020) is the current active edition; the ASTM product record shows it active with an update noted Feb 12, 2021. No later superseding edition was indicated as current at the time of this product summary.

Q: Is it part of a series?

A: D8086-20 is part of the suite of ASTM test methods and practices for electrical insulating liquids maintained by Committee D27; it is commonly used alongside other D27 methods (for example D3612 and D5837) for comprehensive insulating fluid condition assessment.

Q: What are the key keywords?

A: Methanol, ethanol, insulating oil, headspace GC, GC‑MS, GC‑FID, transformer oil, cellulose degradation, oil analysis, condition monitoring.