ISO TR 19441-2018 PDF

Full title and description

ISO/TR 19441:2018 — Petroleum products — Density versus temperature relationships of current fuels, biofuels and biofuel components. This technical report collects and describes measured density versus temperature data for a range of conventional fuels, biofuel components and common blends, and provides guidance for calculating thermal expansion (VCF/alpha15) and for grouping fuels into product-family classes for trade and calibration purposes.

Abstract

ISO/TR 19441:2018 lists recent density measurements at different temperatures for biofuel components and common blends (for example gasoline E5, E10, E85; biodiesel B100, B7), domestic heating oils and paraffinic diesel fuels. It explains use of those data to calculate the thermal expansion coefficient (commonly α at reference 15 °C), compares density/temperature models (exponential, linear, constant-value approaches used in Petroleum Measurement Tables), and gives recommendations for calibration, grouping of fuels into families and handling new components.

General information

• Status: Published.
• Publication date: February 2018 (first edition).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 75.080 (Petroleum products in general).
• Edition / version: Edition 1 (2018).
• Number of pages: 75 pages.

Scope

This technical report provides measured density versus temperature data and guidance for current fuels, biofuels and biofuel components. It supports calculation of the thermal expansion coefficient (α, typically to reference 15 °C), compares modelling approaches used in trade and measurement (notably the exponential VCF model used in the Petroleum Measurement Tables), highlights calibration and modelling limitations, and proposes steps for harmonized treatment of new fuel components entering the market. The document is intended as guidance rather than a prescriptive test method.

Key topics and requirements

• Compilation and description of density vs temperature measurements for fuels, biofuels and components (e.g., E5/E10/E85, B7/B100, domestic heating oils, paraffinic diesels).
• Guidance to calculate the thermal expansion coefficient α (commonly referenced to 15 °C) and to use it for volume correction (VCF).
• Comparison of density/temperature models (exponential model, linear simplifications, constant-value approaches) and discussion of model selection and limits.
• Recommendations for grouping fuels into product-family classes and handling components with unusual behaviour.
• Notes on calibration, measurement uncertainty and minimum data needs (e.g., number of temperature points) to determine sample-specific α.

Typical use and users

Used by fuel testing laboratories, calibration laboratories, refineries, fuel producers and blenders, standards bodies, maritime and commercial fuel trading organizations, and researchers concerned with accurate volume correction and density modelling for fuels and biofuels. The report supports lab data interpretation, model selection for VCF calculations and decisions about product-family grouping for trade and specification purposes.

Related standards

Relevant measurement and test-method standards typically used alongside ISO/TR 19441 include ISO 12185 (determination of density using laboratory density meters with oscillating U‑tube sensors) and ASTM D4052 (density and relative density by digital density meter). The Petroleum Measurement Tables (PMT) conventions and related ISO/TC 28 documents on petroleum measurement are also referenced in the report when discussing VCF models and constants.

Keywords

density, thermal expansion, α (alpha15), VCF, volume correction factor, fuels, biofuels, biodiesel, gasoline blends, paraffinic diesel, Petroleum Measurement Tables, density vs temperature, calibration, petroleum products.

FAQ

Q: What is this standard?

A: ISO/TR 19441:2018 is a Technical Report from ISO that compiles density versus temperature data for current fuels, biofuels and components and provides guidance for calculating thermal expansion (volume correction) and for modelling density/temperature relationships.

Q: What does it cover?

A: It covers measured density data across temperature ranges for fuels and biofuel components, methods to derive the thermal expansion coefficient (α, typically to 15 °C), comparison of VCF/density models (exponential, linear, constant), calibration considerations and recommendations for grouping fuels into product families for trade and measurement.

Q: Who typically uses it?

A: Fuel laboratories, refineries and fuel producers, calibration and quality-control labs, standards committees and organizations involved in fuel trade and measurement use this report to interpret density data, select appropriate VCF models and inform product-family grouping.

Q: Is it current or superseded?

A: ISO/TR 19441 was published as a first-edition technical report in February 2018. Users should check ISO and national standards bodies for any later revisions, related standards or replacement documents.

Q: Is it part of a series?

A: It is a Technical Report produced under ISO/TC 28 (Petroleum and related products) and is intended to complement standards and test methods for density and volume correction (for example ISO 12185 and documents used in the Petroleum Measurement Tables). It is not a prescriptive test method but provides guidance and data useful alongside the standards series for petroleum measurement.

Q: What are the key keywords?

A: Density, thermal expansion, alpha (α, alpha15), VCF, petroleum, biofuels, density vs temperature, calibration, Petroleum Measurement Tables.