Overview
ASTM D2962-23 - Standard Practice for Calculating Volume-Temperature Correction For Coal-Tar Pitches establishes a consistent method for calculating the expansion or contraction of liquid coal-tar pitch volumes in response to temperature changes. Since coal-tar pitch is commonly shipped and stored at varying temperatures, accurate volume measurement is essential for inventory management, custody transfer, and compliance with quality assurance protocols.
This ASTM practice ensures reliable and repeatable results in determining and correcting the measured volume of coal-tar pitch to a specified reference temperature, typically 60 °F (15.6 °C). The procedure uses relative density along with the coefficient of expansion to derive the necessary correction factor.
Key Topics
- Volume-Temperature Correction: This standard details how to convert the measured volume of liquid coal-tar pitch at any given temperature to its equivalent at a standard reference temperature.
- Relative Density Measurement: It references practices for determining the relative density of coal-tar pitch at standard conditions using specified ASTM test methods.
- Expansion Coefficient: Provides a tabulated relationship between relative density and the pitch’s expansion coefficient, which is essential for accurate volume correction.
- Inch-Pound and SI Units: The procedure utilizes inch-pound units as the primary standard, including SI conversions for informational purposes.
- Safety and Regulatory Compliance: Users of this standard are responsible for ensuring proper safety, health, and environmental practices are followed during application.
Applications
The ASTM D2962-23 standard practice is widely used in industries involving coal-tar pitches, such as:
- Petroleum Products Storage and Shipping: Ensuring accurate inventory and transfer measurements in tanks and pipelines, accounting for temperature-induced volume changes.
- Quality Control in Manufacturing: Supporting batch consistency by standardizing product volume at a reference temperature.
- Trade and Custody Transfer: Providing a recognized calculation method to ensure that traded volumes are consistent and fair regardless of shipping or storage temperature fluctuations.
- Regulatory Reporting: Assisting companies in meeting reporting requirements by standardizing measured quantities, thus enabling regulatory compliance and fit-for-purpose documentation.
This standard is especially vital in environments where coal-tar pitch is handled in bulk and temperature variations are significant.
Related Standards
Several ASTM standards are referenced or closely related to ASTM D2962-23, including:
- ASTM D70: Test Method for Specific Gravity and Density of Semi-Solid Asphalt Binder (Pycnometer Method), useful for measuring the density of semi-solid materials.
- ASTM D71: Test Method for Relative Density of Solid Pitch and Asphalt (Displacement Method), relevant for solids and semi-solids related to coal-tar pitches.
- ASTM D4175: Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants, providing definitions that ensure clear and consistent language in the petroleum industry.
By adhering to ASTM D2962-23, organizations ensure improved accuracy in volume correction for coal-tar pitches, facilitating better operational efficiency and contractual fairness. This standard plays a crucial role in quality management, inventory precision, and regulatory compliance within industries handling coal-tar pitch and similar thermally sensitive materials.