ASTM D7061-23 PDF
Name in English:
St ASTM D7061-23
Name in Russian:
Ст ASTM D7061-23
Original standard ASTM D7061-23 in PDF full version. Additional info + preview on request
Full title and description
Standard Test Method for Measuring n‑Heptane Induced Phase Separation of Asphaltene‑Containing Heavy Fuel Oils as Separability Number by an Optical Scanning Device. This test method defines a quantitative procedure, using an optical scanning device, to measure how readily asphaltene‑containing heavy fuel oils diluted in toluene phase separate when n‑heptane is added; results are reported as a separability number (%).
Abstract
This standard specifies sample preparation, controlled addition of n‑heptane to toluene‑diluted heavy fuel oil, and optical scanning measurement of phase separation to produce a separability number. It is intended for laboratory or field use on asphaltene‑containing heavy fuel oils and related refinery fractions and references commonly used fuel specifications for applicability.
General information
- Status: Current (published revision, 2023).
- Publication date: December 1, 2023.
- Publisher: ASTM International.
- ICS / categories: 71.080.10 (Aliphatic hydrocarbons / fuel oils).
- Edition / version: D7061‑23 (2023 edition).
- Number of pages: 7 pages (approx.).
Scope
The standard is limited to asphaltene‑containing heavy fuel oils and applicable refinery fractions. It covers measurement of n‑heptane induced phase separation of toluene‑diluted samples, reporting a separability number (%) determined by an optical scanning device. Typical ASTM specification fuels within scope include grades from Specifications D396, D975, and D2880. The procedure is presented in SI units.
Key topics and requirements
- Definition and relevance of asphaltenes and compatibility in heavy fuel oils.
- Sample dilution in toluene and controlled addition of n‑heptane to induce phase separation.
- Use of an optical scanning device to measure transmittance/optical changes and calculate a separability number (%).
- Reporting format, units (SI), and applicability notes for specific ASTM fuel grades.
- Safety and handling considerations for aromatic and paraffinic solvents (toluene, n‑heptane) and heavy fuel oils.
Typical use and users
Used by fuel testing laboratories, refineries, blending and quality control groups, marine bunker inspectors, and research organizations studying fuel stability and compatibility. It supports compatibility screening, blend qualification, and investigation of phase separation risks in storage and handling.
Related standards
Commonly referenced or related ASTM standards include Specification D396 (fuel oil grades), D975 (diesel fuels), D2880 (marine fuels), and Terminology D4175 for petroleum terms. The 2023 edition supersedes the 2019 edition (D7061‑19 / D7061‑19e1).
Keywords
asphaltenes, separability number, phase separation, heavy fuel oil, n‑heptane, toluene dilution, optical scanning, compatibility, fuel stability, transmittance.
FAQ
Q: What is this standard?
A: ASTM D7061‑23 is a test method that measures n‑heptane induced phase separation of asphaltene‑containing heavy fuel oils and reports a separability number determined by an optical scanning device.
Q: What does it cover?
A: It covers sample preparation (dilution in toluene), controlled addition of n‑heptane, optical scanning measurement of phase separation, calculation and reporting of a separability number, and applicability to specified heavy fuel oil grades.
Q: Who typically uses it?
A: Fuel testing laboratories, blending and quality control teams at refineries, marine fuel inspectors, and researchers assessing fuel compatibility and stability.
Q: Is it current or superseded?
A: Current as of December 1, 2023; it replaces the prior 2019 edition (D7061‑19 / D7061‑19e1). Users should confirm they have the 2023 edition when specifying the method.
Q: Is it part of a series?
A: It is part of ASTM’s collection of petroleum and liquid fuel test methods and is referenced alongside related ASTM fuel specifications and petroleum terminology standards.
Q: What are the key keywords?
A: Asphaltenes, separability number, phase separation, heavy fuel oil, n‑heptane, optical scanning, compatibility, toluene, transmittance.