ASTM D1298-24 PDF

Full title and description

Standard Test Method for Density, Relative Density, or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method — ASTM D1298-24. This test method describes the laboratory use of a glass hydrometer with associated corrections and calculations to determine density, relative density (specific gravity), or API gravity of crude oils and liquid petroleum products and to correct those values to the reference temperatures of 15 °C or 60 °F.

Abstract

ASTM D1298-24 specifies the hydrometer procedure and required corrections (meniscus correction, thermal glass expansion, alternate calibration temperature correction, and temperature correction to reference conditions) for measuring density, relative density (specific gravity) or API gravity of crude petroleum and petroleum products having a Reid vapor pressure ≤ 101.325 kPa. The method is intended primarily for low-viscosity transparent liquids but includes guidance for viscous or opaque samples and contains an annex for equipment verification/certification.

General information

• Status: Current / Active.
• Publication date: November 1, 2024 (designation D1298-24).
• Publisher: ASTM International.
• ICS / categories: 75.040; 75.080 (petroleum-related technologies).
• Edition / version: D1298-24 (2024 edition).
• Number of pages: 8 pages.

Scope

This test method covers laboratory determination, using a glass hydrometer and associated calculations and tables, of density, relative density (specific gravity), or API gravity for crude petroleum, petroleum products, or mixtures normally handled as liquids with Reid vapor pressure ≤ 101.325 kPa. Readings made at temperatures other than the reference must be corrected for meniscus, thermal glass expansion, calibration-temperature differences, and then corrected to the reference temperature (15 °C or 60 °F) by means of Petroleum Measurement Tables or interconversion procedures. Annex A1 provides equipment verification/certification procedures.

Key topics and requirements

• Use of a calibrated glass hydrometer for density / specific gravity / API gravity measurement.
• Mandatory corrections: meniscus correction, thermal glass expansion correction, alternate calibration temperature correction, and temperature correction to reference conditions (15 °C or 60 °F).
• Applicable sample limits: liquids with Reid vapor pressure ≤ 101.325 kPa; guidance for viscous and opaque liquids.
• Recording of initial (uncorrected) hydrometer readings and application of prescribed calculations before reporting final values.
• Annexed procedure for verifying or certifying hydrometer and ancillary equipment.

Typical use and users

Used by petroleum testing and quality-control laboratories, refinery and terminal laboratories, custody-transfer measurement teams, fuel-testing labs, and regulatory or inspection organizations. Typical applications include product specification verification, custody transfer volume-to-mass conversions, routine QC of fuels and lubricants, and correlation with other property tests. Laboratories may choose more precise digital density methods for high-accuracy needs, but D1298 remains relevant where hydrometer equipment is used or specified.

Related standards

Commonly referenced in conjunction with petroleum measurement tables and interconversion procedures (API MPMS Chapter 11.1 and Chapter 11.5 / ASTM D1250 guidance), and compared with other density methods such as ASTM D4052 (digital density meter / oscillating U-tube) and related ASTM/API measurement standards used in custody transfer and laboratory measurement practice. Users often apply D1298 where a hydrometer method is required or when cross-checking against digital methods.

Keywords

density; relative density; specific gravity; API gravity; hydrometer; petroleum; crude oil; petroleum products; temperature correction; Petroleum Measurement Tables; equipment verification.

FAQ

Q: What is this standard?

A: ASTM D1298-24 is the 2024 edition of the standardized hydrometer test method for determining density, relative density (specific gravity), or API gravity of crude petroleum and liquid petroleum products in the laboratory.

Q: What does it cover?

A: It covers the hydrometer measurement procedure plus required corrections (meniscus, thermal glass expansion, alternate calibration temperature) and conversion of measured readings to reference temperatures of 15 °C or 60 °F using Petroleum Measurement Tables. Annex A1 provides equipment verification guidance.

Q: Who typically uses it?

A: Petroleum laboratories, refineries, custody-transfer and terminal measurement operations, fuel-testing labs, and inspectors who need a standardized hydrometer-based procedure for density or API gravity determinations.

Q: Is it current or superseded?

A: D1298-24 is the current/active ASTM designation published November 1, 2024 (D1298-24). Users should confirm they hold the most recent edition for contractual or regulatory use.

Q: Is it part of a series?

A: It is part of the suite of ASTM petroleum measurement standards (Book of Standards volume for petroleum methods) and is often used alongside ASTM D1250 guidance (Petroleum Measurement Tables), API MPMS chapters for interconversion, and other density methods such as ASTM D4052.

Q: What are the key keywords?

A: Density, relative density, specific gravity, API gravity, hydrometer, petroleum products, temperature correction, Petroleum Measurement Tables.