ASTM D86 is the standard test method for determining the quantitative boiling range characteristics of natural and synthetic petroleum products, which laboratories determine by batch distillation at atmospheric pressure. In addition, laboratory evaluation enables researchers to separate light-end volatile compounds from heavier residue fractions under controlled condensation conditions.
The scope of ASTM D86 includes-
- Material type: Light and medium petroleum distillates, motor gasolines, aviation turbine fuels, naphthas, kerosines, gas oils, diesel fuels, and synthetic hydrocarbon liquids.
- Purpose: Measure the distillation temperature profile and the relationship between vapor/liquid yield and liquid fuel to demonstrate volatility compliance and distillation characteristics.
- Elements analyzed: Initial boiling point (IBP), Temperature at specific volume percentage recovered (5%, 10%, 50%, 90%, 95%), Final boiling point (FBP/End Point), Percent recovery, Percent residue, and Percent loss.
- Method: Technicians heat a measured liquid sample in a standardized flask under controlled thermal ramp rates, condensing vapors through an ice-cooled bath and collecting distillate in a calibrated graduated cylinder.
- Result: Technicians build a standardized distillation curve, which is a graph of corrected boiling temperature against volume percent recovered, showing all critical temperature-volume points.
- Test Limitations: Applies to atmospheric distillations of liquids to a maximum liquid temperature of 400 °C, but does not apply to heavy residual fuel oils, lubricating base oils, or liquefied petroleum gases.
- Environmental conditions: Ambient atmospheric pressure monitoring (101.3kPa nominal), temperature-controlled condenser bath, shielded heating enclosures (to prevent air draft interference).
- Applications: Fuel Specification Verification for commercial fuel, regulatory compliance testing, engine fuel performance modeling, pipeline shipment/supplier batch acceptance, process control in petroleum refineries.
What are the Uses of ASTM D86 Testing?
Petroleum chemists and refinery process managers use ASTM D86 to manage distillation cut-points and verify that liquid fuels meet tight volatility requirements. The standardized test method provides a repeatable laboratory procedure to separate the vapor-liquid equilibrium properties over a range of fuel compositions. This standard:
- Helps refinery gasoline blenders fine-tune gasoline formulations to achieve cold-weather ease of start-up and hot-weather vapor lock.
- Supports laboratories for quality control of jet fuel flash point and diesel fuel front-end volatility.
- Provides essential physical property information for fuel transportation safety datasheets and environmental compliance submissions.
- Ensures component purities are verified and that solvent cuts and special naphthas are in tight distillation range windows.
- Recognizes contamination threats when contaminated heavy gas oils or light solvents are inadvertently mixed into commercial fuel streams.
What Materials Can Be Tested Under ASTM D86?
ASTM D86 covers Light, middle, and Specialty petroleum distillates. The standard covers four sample categories, from highly volatile automotive gasolines and naphthas to low-volatile heavy diesel fuels and heating oils. Technicians assess liquid fuels of various hydrotreated, cracked, and synthetic hydrocarbon mixtures, such as mixtures of oxygenated gasoline containing up to fifteen percent ethanol. The assessment of boiling distribution of these fuels is important to ensure reliable ignition of the engine, clean combustion, and even vapor pressure from commercial energy products. Technicians are also testing renewable hydrotreated vegetable oils (HVO) and sustainable aviation fuel (SAF) blendstocks to ensure bio-derived synthetic hydrocarbons are identical to the profile of hydrocarbons.
Why is ASTM D86 Important?
ASTM D86 provides an essential volatility standard to protect internal combustion engines, turbine combustors, and fuel delivery systems from fuel-performance failures. High levels of light-end fractions in petroleum fuels lead to vapor lock in fuel lines, increased evaporative emissions, and unsafe storage conditions. On the other hand, high levels of heavy-end fractions lead to incomplete burning, excessive engine deposits, engine oil dilution, and high levels of particulate emissions from the tailpipe. With a standardized evaluation (ASTM D86), vapor pressure and distillation properties are guaranteed to be consistent, which prevents engine damage, operational downtime, and costly off-spec product shipments.
